CN220705846U

CN220705846U - Combined ball type hydraulic end

Info

Publication number: CN220705846U
Application number: CN202322293548.7U
Authority: CN
Inventors: 徐骁; 陈涛; 张原瑞; 王贺
Original assignee: Shanghai Qinghe Machinery Co ltd
Current assignee: Shanghai Qinghe Machinery Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2024-04-02
Anticipated expiration: 2033-08-25

Abstract

The utility model relates to a combined ball type hydraulic end, which comprises a valve box, a suction gland flange, a suction gland, a packing box flange and a packing box assembly, wherein the valve box is arranged on the valve box; a suction gland flange, a suction gland cap and a suction gland are fixed on the suction end side of the valve box; a packing box flange and a packing box assembly are fixed at the end side of the valve box plunger; a lower ball valve assembly and an upper ball valve assembly are arranged in the inner cavity of the valve box; the suction gland is integrally provided with a limiting frame, and the limiting frame is arranged above the lower ball valve assembly to position and limit the lower ball valve assembly. Compared with the prior art, the combined ball type hydraulic end suction gland and the limiting frame are integrally designed, so that the strength of the limiting part is improved, the impact of the lower ball valve assembly on the hydraulic end in the working process is prevented from being damaged, and the impact on the plunger and the power end after the impact is prevented.

Description

Combined ball type hydraulic end

Technical Field

The utility model relates to the technical field of oilfield fracturing operation, in particular to a combined ball type hydraulic end.

Background

In petroleum exploration and development operation, fracturing and acidification construction are one of important means for modifying a petroleum and gas reservoir, and fracturing construction is an effective method for increasing the fluidity of petroleum and improving the petroleum recovery ratio by injecting high-pressure fluid to enable a well bottom stratum to form sand filling cracks with sufficient size, and is an indispensable exploitation means especially for exploitation of unconventional petroleum and gas.

The most important equipment for fracturing construction is a fracturing truck, a fracturing skid or complete electric drive fracturing equipment, the nature of the equipment is a high-power plunger pump (fracturing pump), no matter the equipment is the fracturing truck, the fracturing skid or the complete electric drive fracturing equipment, and a hydraulic end is an indispensable component part, so that the fracturing pump, particularly the hydraulic end, has the characteristics of high pressure resistance, fatigue resistance, corrosion resistance, strong abrasion resistance, long service life and the like, the valve box of the hydraulic end is subjected to high-frequency and high-amplitude periodical pressure, and the common damage belongs to stress corrosion fatigue damage under high stress.

The main components of the hydraulic end, such as the valve box, the valve seat, the valve body, the rubber sheet and the like, belong to the consumable parts, the main way of unconventional oil gas exploitation is to add staged fracturing to the horizontal well, along with the development of unconventional oil gas exploitation technology, the number of high-pressure wells and deep wells in oil gas exploitation is gradually increased, the pressure born by the hydraulic end of the high-pressure plunger pump is also increased, the severe high-pressure condition causes the service life of the valve box to be greatly influenced, the service life of the valve box is continuously reduced, and the valve seat, the valve body, the rubber sheet and other components are more easily consumed and damaged. In addition, because of different construction working conditions, plunger sizes used by hydraulic ends are different, different hydraulic end assemblies must be replaced according to actual field requirements of plunger diameters in the existing products, and the fracturing process efficiency and a series of related costs are seriously affected by frequent replacement of the hydraulic end assemblies of the fracturing pump and the cracked valve boxes. Therefore, the novel hydraulic end assembly with high power, large discharge capacity, corrosion resistance, abrasion resistance, high pressure, long service life of valve boxes, long service life of vulnerable parts and convenient disassembly and assembly is innovatively developed, and is a necessary trend.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the combined ball type hydraulic end, the weight and the production cost of the hydraulic end are reduced through the structural design, the fracturing construction cost is reduced, and the construction efficiency is improved; the integral ball valve assembly is designed in the inner part, the installation and the disassembly are convenient, the operation is durable, the service life of the ball valve assembly is obviously prolonged compared with that of a traditional valve body and a valve seat, the suction gland and the limiting frame are designed integrally, the strength of the limiting part is improved, the damage to the limiting frame caused by the impact of the ball valve assembly on the hydraulic end in the working process is prevented, and the influence on the plunger and the power end after the damage is prevented.

The object of the present utility model can be achieved by:

the utility model aims to provide a combined ball type hydraulic end, which comprises a valve box, a suction gland flange, a suction gland, a packing box flange and a packing box assembly, wherein the valve box is provided with a valve seat; a suction gland flange, a suction gland cap and a suction gland are fixed on the suction end side of the valve box; a packing box flange and a packing box assembly are fixed at the end side of the valve box plunger; a lower ball valve assembly and an upper ball valve assembly are arranged in the inner cavity of the valve box; the suction gland is integrally provided with a limiting frame, and the limiting frame is arranged above the lower ball valve assembly to position and limit the lower ball valve assembly.

Further, the suction gland and the limiting frame are integrally designed, so that the strength of the limiting part is improved, the impact of the lower ball valve assembly on the hydraulic end in the working process is prevented from damaging the limiting frame, and the impact on the plunger and the power end after the impact is prevented. The cross section of the integrated integral structure is U-shaped.

Further, the combined ball type hydraulic end further comprises a plunger, a fixed plate and a connecting pull rod; one end of the plunger extends into the valve box through the packing box assembly; the connecting pull rod penetrates through the valve box; the fixed plate is connected with the valve box through a connecting pull rod; one end of the packing box component is connected to the fixed plate; the other end of the plunger is connected to the fixed plate through the packing box component.

Further, the combined ball-type hydraulic end further comprises a discharge gland flange, a discharge gland cap and a discharge gland; and a discharge gland flange, a discharge gland cap and a discharge gland are fixed on the discharge end side of the valve box.

Further, the suction end side and the plunger end side are both located on the valve box side face, and the discharge end side is located on the valve box top face.

Further, the suction gland flange, the packing box flange and the discharge gland flange are detachably arranged on the valve box through fasteners. The valve box external part is effectively connected with the valve box body by using a fastener, and a high-pressure sealing structure is designed according to the connection characteristic.

Further, the suction gland flange is connected with the suction gland cap through threads; the discharge gland flange is connected with the discharge gland cap through threads; the other end of the packing box component is arranged in the valve box and is fixed through a packing box flange.

Further, functional parts which are originally processed in the valve box, such as a suction pressure cap and a discharge pressure cap, are transferred to be connected with external parts of the valve box by means of bolts or mechanical threaded connection.

Further, the valve box is of a hexahedral structure, the appearance structure of the hydraulic end valve box is greatly changed compared with that of a traditional valve box, the appearance of a finished part is converted into the hexahedral appearance from an irregular geometrical body, the weight is reduced, and the machining cost is greatly reduced.

Further, six faces of the valve box are respectively provided with a mounting fastener connecting hole site; the plunger end side of the valve box is provided with a positioning hole for installing the packing box component and a pull rod connecting and fixing hole site for connecting a connecting pull rod; the suction end side of the valve box is provided with a mounting hole for mounting the suction gland, and the discharge end side of the valve box is provided with a mounting hole for mounting the discharge gland.

Further, the valve box is provided with a plurality of inner cavities, and the valve box is provided with a suction gland flange, a suction gland cap, a suction gland, a packing box flange, a packing box assembly, a discharge gland flange, a discharge gland cap and a discharge gland, which are matched with the number of the inner cavities.

Further, the packing box assembly comprises a packing compression nut, a packing box body, a packing box seal and a second O-shaped ring; the second O-shaped ring is arranged in a groove at the outer side of the packing box body, and is matched with the outer side of the packing box body to be in contact with the valve box so as to realize high-pressure-resistant sealing; the packing box is hermetically arranged in the packing box body; the packing compaction nut is arranged on one side of the packing box body and is used for compacting the packing box for sealing.

Further, the lower ball valve assembly and the upper ball valve assembly have the same structure and are all ball valve assemblies; the upper ball valve assembly is arranged above the plunger; the lower ball valve assembly is arranged below the plunger; the lower ball valve assembly and the upper ball valve assembly comprise valve seats, first O-shaped rings, rubber sheets, ball pressing caps and steel balls; the first O-shaped ring is arranged on the outer ring of the valve seat and plays a role in sealing and compacting; the rubber is embedded into the valve seat; the steel ball is arranged on the valve seat; the ball press cap is connected with the valve seat through threads.

Furthermore, the rubber is made of special materials (such as valve rubber) and special structural design (the steel ball is arranged on the rubber), and in the working state of the hydraulic end, the steel ball and the rubber can be perfectly matched, so that the overall durability is improved.

Further, the fixed plate is connected with a power end of the plunger pump.

Further, a hydraulic end connecting pull rod hole and a power end connecting pull rod hole are formed in the fixed plate; the hydraulic end connecting pull rod hole is formed in the inner ring of the fixed plate; the power end connecting pull rod hole is formed in the outer ring of the fixed plate; the hydraulic end connecting pull rod hole is used for being fixedly connected with the valve box; the connecting pull rod penetrates through a hydraulic end connecting pull rod hole on the fixed plate to connect the fixed plate and the valve box; the power end connecting pull rod hole is used for being fixedly connected with the power end of the plunger pump.

Further, the combined ball type hydraulic end appearance is through the design of modularization, under the prerequisite of guaranteeing safety, has reduced the weight and the processing cost of hydraulic end key parts valve box, and weight reduction by a wide margin adopts independent packing box design in the mounting position of the packing plunger that the hydraulic end valve box is easy to erode the damage simultaneously, can adapt to the plunger of different diameters through changing different packing box subassemblies, so reduces the weight of fracturing pump hydraulic end. In addition, the hydraulic end adopts a fixed plate connection design, and the hydraulic end of the fracturing pump is connected with the power end through the fixed plate.

Further, the modular assembly may be common on the same configuration of frac pump fluid ends. The packing box assembly in the modularized assembly can be replaced under the condition that the whole hydraulic end of the fracturing pump is not dismounted and moved, so that the packing box assembly can be quickly replaced under the condition of adapting to plungers with different diameters.

Furthermore, the valve boxes can be used interchangeably as long as the distance from the installation reference surface to the plunger motion plane and the cylinder distance of the hydraulic ends of the fracturing pumps with the same cylinder number and different models are the same.

Further, the lower ball valve assembly and the upper ball valve assembly are designed in an integral ball mode, and the integral ball valve assembly can be installed in the valve box after being installed in advance, so that the installation efficiency is greatly improved.

Further, ball parts are used as control elements for liquid inflow and outflow in the lower ball valve assembly and the upper ball valve assembly, and rubber and the ball body of the steel ball are matched to achieve the purpose of sealing and isolating liquid.

Further, the combined ball type hydraulic end adopts a split structure, and the hydraulic end body (valve box) is connected with the fixed plate by adopting a connecting pull rod, so that the whole transverse positioning distance of the hydraulic end can be adjusted through the fixed plate, and the power end and the fixed plate are connected at different positions so as to better meet the installation and matching requirements between the power end and the hydraulic end.

Compared with the prior art, the utility model has the following beneficial effects:

1) According to the combined ball type hydraulic end provided by the utility model, the suction gland and the limiting frame are integrally designed, so that the functional strength of the limiting frame is increased, the installation is more convenient, the strength of the limiting part is improved, the impact of the lower ball valve assembly on the hydraulic end in the working process is prevented from damaging the limiting frame, and the impact on the plunger and the power end after the impact is prevented.

2) According to the combined ball type hydraulic end provided by the utility model, the fixing plate can adjust the overall transverse positioning distance of the hydraulic end through the pull rod or the body structural design, so that different installation distances between the power end and the hydraulic end are met, and different positions of connection of the power end and the fixing plate are met.

3) The combined ball type hydraulic end provided by the utility model has the advantages that the weight of the valve box is greatly reduced, the product cost is greatly reduced, and the construction efficiency is effectively improved. The overall weight of the hydraulic end of the fracturing pump is reduced, the transportation cost is reduced, and the assembly efficiency of the whole machine on the construction site is improved.

4) According to the combined ball type hydraulic end provided by the utility model, the processing technology of the key valve box is simpler, and the machining efficiency of a product is obviously improved.

5) The combined ball type hydraulic end provided by the utility model effectively reduces the variety of the hydraulic end, and one hydraulic end product can realize the exchange of plungers with different sizes by replacing different packing box components

6) According to the combined ball-type hydraulic end provided by the utility model, as long as the distance from the installation reference surface to the plunger motion plane and the cylinder distance are the same, the valve boxes can be interchanged, and the whole machine modularized combined production of the valve boxes of the hydraulic end of the fracturing pump is realized.

7) The combined ball type hydraulic end provided by the utility model has the advantages that the ball valve assembly adopts an integral ball type design, can be pre-installed into a set of parts, and is installed into the valve box, so that the assembly and field maintenance efficiency is greatly improved.

Drawings

Fig. 1 is a structural outline view of a combined ball-type fluid end according to an embodiment of the present utility model.

Fig. 2 is a structural outline view of a combined ball-type fluid end according to an embodiment of the present utility model.

Fig. 3 is a cross-sectional view of a combined ball and socket fluid end in an embodiment of the utility model.

Fig. 4 is a structural outline view of a valve housing of a combined ball-type fluid end in an embodiment of the present utility model.

Fig. 5 is a structural outline view of a packing box assembly and a plunger of a combined ball-type fluid end in an embodiment of the present utility model.

Fig. 6 is a cross-sectional view of a packing box assembly and plunger of a combined ball and socket fluid end in an embodiment of the present utility model.

Fig. 7 is a cross-sectional view of a ball valve assembly of a combined ball and fluid end in an embodiment of the utility model.

Fig. 8 is a structural outline view of a fixed plate of a combined type ball-type fluid end in an embodiment of the present utility model.

Fig. 9 is a sectional view of a valve housing of a conventional combined ball and socket type fluid end in a comparative example.

The reference numerals in the figures indicate:

1. valve box, 2, suction gland flange, 3, suction gland cap, 4, suction gland, 5, fastener, 6, lower ball valve assembly, 7, packing box flange, 8, packing box assembly, 9, plunger, 10, upper ball valve assembly, 11, discharge gland flange, 12, discharge gland cap, 13, discharge gland, 14, valve seat, 15, first O-ring, 16, rubber, 17, ball gland cap, 18, steel ball, 19, fixed plate, 20, connecting pull rod, 21, pull rod connecting fixed hole site, 22, fastener connecting hole site, 23, packing compression nut, 24, packing box body, 25, second O-ring, 26, packing box seal, 27, hydraulic end connecting pull rod hole, 28, power end connecting pull rod hole; 4-1, a traditional limiting frame.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples. Features of the present utility model such as component model, material names, connection structures, etc., which are not explicitly described, are all considered common technical features disclosed in the prior art.

Examples

As shown in fig. 1 to 8, the present embodiment provides a combined ball type fluid end.

Fig. 1 and 2 are structural outline views of the hydraulic end, fig. 3 is a sectional view formed after cutting a ball-type hydraulic end, the hydraulic end is based on a valve box 1, the hydraulic end is based on the valve box 1, 5 pieces of a suction gland flange 2, a suction gland 3 and a suction gland 4 are fixed on the suction end side of the hydraulic end, 5 pieces of a fastening piece 5 are used for fixing the hydraulic end, 5 pieces of a discharge gland flange 11, a discharge gland 12 and a discharge gland 13 are fixed on the discharge end side of the hydraulic end, 5 pieces of the fastening piece are also used for fixing the hydraulic end, the gland flange and the gland are in threaded connection, namely the suction gland flange 2 and the suction gland 3 are in threaded connection, the discharge gland flange 11 and the discharge gland 12 are in threaded connection, the connecting threads are preferably saw-tooth threads, two sealing pieces are adopted for the suction gland 4 and the discharge gland 13, the sealing pieces can be O-shaped rings and gland seals, so as to bear the pressure inside the valve box 1 during operation, the packing box 8 is fixed on the plunger end side, 5 pieces of the packing box 8 are fixed on the packing box, the packing box 8 is also fixed on the packing box 1, the packing box 8 is fixed on the fastener, the packing box 8 is fixed on the locating hole 7 in the valve box 1, the packing box 7 is fixed by means of the packing box 1, the packing box 1 is fixed by the sealing box 1, and the sealing piece is connected with the valve box 1 by the flange 19, and the valve box 1 is connected by the flange and the sealing piece is connected by the sealing element, and the valve box 1 is connected by the sealing element and the valve box 1. The hydraulic end inner cavity is provided with a lower ball valve assembly 6 and an upper ball valve assembly 10.

Fig. 4 is a valve box external view of the hydraulic end of the present utility model, and in combination with fig. 1 and 2, when the valve box is installed, the valve box is positioned by means of connecting a pull rod to a fixed hole 21, and is connected with a fixed plate 19 by using a connecting pull rod 20, then the fixed plate 19 is connected with a power end of a plunger pump, after the connection, the plunger 9 is driven by the power end of the plunger pump to perform reciprocating linear motion, and the change of the internal volume of a light body of the valve box 1 is realized in the motion process, so that the suction of low-pressure fluid and the discharge of high-pressure fluid are realized, in detail, when the plunger 9 moves away from the hydraulic end, due to the pressure difference, the lower ball valve assembly 6: the steel ball 18 is far away from the valve seat 14, the steel ball 18 is far away from the valve seat 14 to generate an annular gap, low-pressure fluid enters the valve box 1, and when the plunger moves close to the hydraulic end, due to the pressure difference, the upper ball valve assembly 10 comprises: the steel ball 18 is far away from the valve seat 14, the steel ball 18 is far away from the valve seat 14 to generate an annular gap, fluid in the cavity is compressed to generate high-pressure fluid to be discharged out of the valve box 1 through the annular gap, the steel ball 18 is protected by the ball pressing cap 17 and moves in the ball valve assembly all the time, and in addition, the rubber 16 is used for buffering and protecting the steel ball 18 and the valve seat 14. The lower ball valve assembly 6 is positioned using a stopper integrally provided with the suction gland 4 as a stopper, and the upper ball valve assembly 10 is positioned using the discharge gland 13 as a stopper.

As shown in fig. 4, the regular hexahedral valve casing 1 is provided with a series of tie rod connecting and fixing holes 21 and fastener connecting holes 22, and different external part assemblies are selected according to different requirements. The threaded holes are used for connecting and fixing the flange, and the connecting and fixing hole 21 of the pull rod is connected with the fixing plate 19 by using the connecting pull rod 20.

As shown in fig. 5 and 6, the packing box assembly 8 is an important component of the product, the packing box assembly 8 can be assembled with different valve box 1 bodies, the packing box assembly 8 is fixed by means of the packing box flange 7, the fixing plate 19 and the connecting pull rod 20, the packing box assembly 8 comprises a packing compression nut 23, the packing box body 24 and several parts of packing box seals 26, packing box connecting grooves are formed in the packing box assembly 8, second O-rings 25 are installed in the packing box connecting grooves, the second O-rings 25 are matched with the outer sides of the packing box body 24 to be in contact with the valve box mounting holes to realize high-pressure sealing of metals and non-metals, and the high-pressure sealing requirements of different plungers can be met by replacing the packing box seals 26 and the packing compression nuts 23.

As shown in fig. 7, the ball valve assembly is composed of a valve seat 14, a first O-ring 15, a rubber 16, a ball pressing cap 17 and a steel ball 18, wherein the first O-ring 15 is arranged on the outer ring of the valve seat 14 to play a sealing and pressing role, the rubber 16 is embedded into the valve seat 14, the steel ball 18 is arranged in the valve seat 14, and the ball pressing cap 17 is positioned with the valve seat 14 through threads and gaskets, so that the ball valve assembly is completely installed.

As shown in fig. 8, the inner ring of the fixed plate 19 is provided with a hydraulic end connecting pull rod hole 27 which is fixedly connected with the valve box 1, and the outer ring is provided with a power end connecting pull rod hole 28 which is fixedly connected with the power end. By adjusting the thickness or shape of the fixing plate 19, the positions of the connecting pull rod 20, the hydraulic end connecting pull rod hole 27 and the power end connecting pull rod hole 28 are adjusted, so that the requirements of different assembly distances between the power end and the hydraulic end and the requirements of different positions can be met.

Comparative example

To better illustrate the effects of the present utility model, this comparative example provides a conventional combination type frac pump fluid end, and fig. 8 is a sectional view of a valve housing 1 of a conventional combination type ball fluid end, which is used interchangeably with the valve housing 1 of the above-described embodiment.

The packing box seal 26 in the traditional hydraulic end is directly installed in the valve box 1, and is pressed and fixed by the packing pressing nut 23, so that once the valve box 1 is installed in a positioning hole of the packing box seal 26, the valve box 1 can be scrapped integrally.

In the present comparative example, the suction cap 3 and the discharge cap 12 are integrally fitted inside the valve housing 1, and are difficult to be replaced.

The packing box assembly 8 in this comparative example has a large part of the main body embedded inside the valve box 1, and is not easily removable as compared with the case where the packing box assembly 8 in the embodiment is fixed by means of the packing box flange 7.

The cross section of the traditional limiting frame 4-1 in the comparative example is L-shaped, the traditional limiting frame 4-1 is connected with the suction gland 4 through a limiting frame fastener, and the traditional limiting frame is not integrally arranged in the embodiment, the strength of a limiting part is low, the impact of the lower valve seat assembly 6 on the traditional limiting frame 4-1 is easy to damage the traditional limiting frame 4-1 in the working process of a hydraulic end, and the traditional limiting frame 4-1 can influence the plunger 9 and a power end after being damaged.

The combined structure of the utility model can reduce the weight of the valve box 1 body of the high-value vulnerable part, parts connected with the outside of the valve box 1 can be used for a long time, and the hydraulic end and different power ends can be installed by replacing the external parts, especially the fixing plate 10. The fixing plate 10 can adjust the overall transverse positioning distance of the hydraulic end through the pull rod or the body structural design, so that different installation distances between the power end and the hydraulic end are met, and different positions of connection of the power end and the fixing plate 10 are met. The suction gland 4 and the limiting frame are integrally designed, so that the strength of the limiting part is improved, the damage of the limiting frame caused by the impact of the lower valve seat assembly 6 on the hydraulic end in the working process is prevented, and the influence on the plunger 9 and the power end after the damage is prevented.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims

1. The combined ball type hydraulic end is characterized by comprising a valve box (1), a suction gland flange (2), a suction gland cap (3), a suction gland (4), a packing box flange (7) and a packing box assembly (8);

a suction gland flange (2), a suction gland cap (3) and a suction gland (4) are fixed on the suction end side of the valve box (1);

a packing box flange (7) and a packing box assembly (8) are fixed at the plunger end side of the valve box (1);

a lower ball valve assembly (6) and an upper ball valve assembly (10) are arranged in the inner cavity of the valve box (1);

a limiting frame is integrally arranged on the suction gland (4) and is arranged above the lower ball valve assembly (6) so as to position and limit the lower ball valve assembly (6);

the combined ball type hydraulic end further comprises a plunger (9), a fixing plate (19) and a connecting pull rod (20);

one end of the plunger (9) extends into the valve box (1) through the packing box assembly (8);

the connecting pull rod (20) penetrates through the valve box (1);

the fixed plate (19) is connected with the valve box (1) through a connecting pull rod (20);

one end of the packing box assembly (8) is connected to the fixed plate (19);

the other end of the plunger (9) is connected to the fixed plate (19) through the packing box component (8).

2. A combined ball and socket fluid end according to claim 1, characterized in that it further comprises a discharge gland flange (11), a discharge gland cap (12), a discharge gland (13);

a discharge gland flange (11), a discharge gland cap (12) and a discharge gland (13) are fixed on the discharge end side of the valve box (1).

3. A combined ball and socket type fluid end according to claim 2, wherein the suction gland flange (2), the packing box flange (7) and the discharge gland flange (11) are detachably mounted on the valve box (1) through fasteners (5).

4. A combined ball and socket fluid end according to claim 2, characterized in that the suction gland flange (2) and suction gland cap (3) are connected by screw threads;

the discharge gland flange (11) is connected with the discharge gland cap (12) through threads;

the other end of the packing box component (8) is arranged in the valve box (1) and is fixed through a packing box flange (7).

5. A combined ball-type fluid end according to claim 2, characterized in that the valve housing (1) is of hexahedral structure;

six faces of the valve box (1) are respectively provided with a mounting fastener connecting hole site (22);

the plunger end side of the valve box (1) is provided with a positioning hole for installing a packing box assembly (8) and a pull rod connecting and fixing hole site (21) for connecting a connecting pull rod (20);

the suction end side of the valve box (1) is provided with a mounting hole for mounting the suction gland (4), and the discharge end side of the valve box (1) is provided with a mounting hole for mounting the discharge gland (13).

6. A combined ball and socket type fluid end according to claim 2, wherein the valve box (1) is provided with a plurality of inner cavities, and the valve box (1) is provided with a suction gland flange (2), a suction gland cap (3), a suction gland (4), a packing box flange (7), a packing box assembly (8), a discharge gland flange (11), a discharge gland cap (12) and a discharge gland (13) which are matched with the number of the inner cavities.

7. A combined ball and socket fluid end according to claim 1, characterized in that the packing box assembly (8) comprises a packing gland nut (23), a packing box body (24), a packing box seal (26), a second O-ring (25);

the second O-shaped ring (25) is arranged in a groove at the outer side of the packing box body (24), and the second O-shaped ring (25) is matched with the outer side of the packing box body (24) to be in contact with the valve box (1) so as to realize high-pressure-resistant sealing;

the packing box seal (26) is arranged in the packing box body (24);

the packing compression nut (23) is arranged on one side of the packing box body (24) and compresses the packing box seal (26).

8. A combined ball and socket fluid end according to claim 1, characterized in that the upper ball valve assembly (10) is arranged above the plunger (9);

the lower ball valve assembly (6) is arranged below the plunger (9);

the lower ball valve assembly (6) and the upper ball valve assembly (10) comprise a valve seat (14), a first O-shaped ring (15), a rubber sheet (16), a ball pressing cap (17) and a steel ball (18);

the first O-shaped ring (15) is arranged on the outer ring of the valve seat (14);

the rubber (16) is embedded into the valve seat (14);

the steel ball (18) is arranged on the valve seat (14);

the ball press cap (17) is connected with the valve seat (14) through threads.

9. A combined ball and socket fluid end according to claim 1, characterized in that the fixed plate (19) is connected to the power end of the plunger pump.

10. A combined ball type hydraulic end according to claim 9, characterized in that the fixed plate (19) is provided with a hydraulic end connecting pull rod hole (27) and a power end connecting pull rod hole (28);

the hydraulic end connecting pull rod hole (27) is arranged at the inner ring of the fixed plate (19);

the power end connecting pull rod hole (28) is arranged on the outer ring of the fixed plate (19);

the hydraulic end connecting pull rod hole (27) is used for being connected with the valve box (1);

the connecting pull rod (20) penetrates through a hydraulic end connecting pull rod hole (27) on the fixed plate (19) to connect the fixed plate (19) and the valve box (1);

the power end connecting pull rod hole (28) is used for being connected with the power end of the plunger pump.