阅读说明：本技术 一种长寿命的柱塞泵液力端 (Long-life plunger pump hydraulic end ) 是由 李晓斌 姜琛 王继鑫 郭子蒙 李朋 李海龙 于 2020-07-17 设计创作，主要内容包括：本发明公开了一种长寿命的柱塞泵液力端,所述柱塞泵液力端包括阀箱,柱塞和盘根总成,所述阀箱作为液体输送的容器,所述柱塞通过盘根总成与阀箱连接,所述盘根总成包括盘根组件,盘根套,盘根压帽,盘根套压帽,所述盘根套与阀箱密封连接,在盘根套与柱塞之间填充用于密封的盘根组件,盘根套压帽用于固定盘根套,盘根压帽用于固定盘根组件。有益效果：通过分别对柱塞,吸入压盖,吸入压帽,排出压帽的优化设计,提升了阀箱,吸入压盖,吸入压帽和排出压帽的使命寿命,从而提升柱塞泵液力端的使命寿命。(The invention discloses a long-life plunger pump hydraulic end which comprises a valve box, a plunger and a packing assembly, wherein the valve box is used as a container for conveying liquid, the plunger is connected with the valve box through the packing assembly, the packing assembly comprises a packing component, a packing sleeve, a packing pressing cap and a packing sleeve pressing cap, the packing sleeve is hermetically connected with the valve box, a packing component for sealing is filled between the packing sleeve and the plunger, the packing sleeve pressing cap is used for fixing the packing sleeve, and the packing pressing cap is used for fixing the packing component. Has the advantages that: through the optimized design of the plunger, the suction gland, the suction pressure cap and the discharge pressure cap, the service lives of the valve box, the suction gland, the suction pressure cap and the discharge pressure cap are prolonged, and therefore the service life of a hydraulic end of the plunger pump is prolonged.)

1. The utility model provides a long-life plunger pump hydraulic pressure end, plunger pump hydraulic pressure end includes valve box, plunger and packing assembly, the valve box is as liquid transport's container, the plunger passes through the packing assembly and is connected its characterized in that with the valve box: the packing assembly comprises a packing assembly, a packing sleeve, a packing pressing cap and a packing sleeve pressing cap, wherein the packing sleeve is connected with the valve box in a sealing manner, the packing assembly used for sealing is filled between the packing sleeve and the plunger, the packing sleeve pressing cap is used for fixing the packing sleeve, and the packing pressing cap is used for fixing the packing assembly.

2. The long life plunger pump fluid end of claim 1, wherein: the plunger pump hydraulic end also comprises a suction pressure cap, a discharge pressure cap, a suction gland, a discharge gland, a suction gland seal, a discharge gland seal, a valve assembly and a spring support, wherein the liquid suction port and the liquid discharge port of the valve box are respectively provided with the valve assembly for controlling liquid suction and discharge, the suction gland is in sealing connection with the liquid suction port of the valve box through the suction gland seal, the suction pressure cap is used for fixing the suction gland, the discharge gland is connected with the valve assembly of the liquid discharge port of the valve box, the discharge gland is in sealing connection with the liquid discharge port of the valve box through the discharge gland seal, the discharge pressure cap is used for fixing the discharge gland, and the valve assembly arranged at the liquid suction port of the valve box is connected with the suction gland through the spring support.

3. The long life plunger pump fluid end of claim 2, wherein: one end face of the suction gland is an arc face, a protruding block extends out of the arc face, and the protruding block is used for connecting the spring support.

4. The long life plunger pump fluid end of claim 2, wherein: the suction gland seal adopts a form of combining a D-shaped seal ring and an L-shaped seal ring.

5. The long life plunger pump fluid end of claim 4, wherein: the D-shaped sealing ring is embedded on the suction gland.

6. The long life plunger pump fluid end of claim 4, wherein: the L-shaped sealing ring is embedded on the suction gland.

7. The long life plunger pump fluid end of claim 6, wherein: the suction gland is provided with a first right-angle end, the valve box corresponding to the first right-angle end is provided with a second right-angle end, the first right-angle end is matched with the second right-angle end for use, the second right-angle end is used for limiting the suction gland, and an L-shaped sealing ring is filled between the first right-angle end and the second right-angle end.

8. The long life plunger pump fluid end of claim 7, wherein: one end of the L-shaped sealing ring is used for sealing between the first right-angle end and the second right-angle end in the vertical direction, and the other end of the L-shaped sealing ring is used for axially sealing between the first right-angle end and the second right-angle end.

9. The long life plunger pump fluid end of claim 2, wherein: the end surface of the suction pressure cap is provided with an annular groove, and the groove is arranged at one end close to the suction pressure cover.

10. The long life plunger pump fluid end of claim 2, wherein: an annular groove is formed in the end face of the discharge pressure cap, and the groove is formed in one end, close to the discharge pressure cap, of the groove.

11. The long life plunger pump fluid end of claim 10, wherein: the cross section of the annular groove is arc-shaped.

12. The long life plunger pump fluid end of claim 2, wherein: the discharge gland is sealed by a D-shaped sealing ring and is embedded on the discharge gland in a sealing manner.

13. The long life plunger pump fluid end of claim 1, wherein: the end part of the plunger is an arc surface.

14. The long life plunger pump fluid end of claim 1, wherein: the packing sleeve and the valve box are sealed by adopting a mode of combining a D-shaped sealing ring and a sealing gasket.

15. The long life plunger pump fluid end of claim 14, wherein: the packing sleeve is of a Z-shaped structure, a sinking platform is arranged on the valve box and used for limiting the packing sleeve, and a sealing gasket is filled between the sinking platform and the packing sleeve.

Technical Field

The invention relates to the technical field of plunger pumps, in particular to a long-service-life plunger pump hydraulic end.

Background

The hydraulic fracturing construction is a great assistance for realizing yield increase of oil and gas fields, the fracturing equipment serving as main power is a core component, a hydraulic end in the fracturing equipment is a key point for influencing the construction, fracturing fluid or sand carrying fluid enters through a low pressure port of the hydraulic end, and a medium in a cavity of the hydraulic end is pressurized in the reciprocating motion of a plunger and enters a well bottom through a high-pressure pipeline. Along with the increasing of shale gas exploration and development strength in China, the requirements on fracturing equipment are continuously improved, the pressure value is continuously increased in the fracturing construction process, the construction environment is severe, the construction time is prolonged, in the operation process, the stress of a hydraulic end valve box is concentrated and the hydraulic end valve box is seriously abraded, the stress of a pressing cap and a pressing cover is large, a sealing element is easy to damage, a valve seat is easy to erode, and the like, so that the service life of the hydraulic end is influenced. At present, the service life of a conventional hydraulic end is short, the pump is frequently assembled and replaced, and the operation progress of a user is seriously influenced, so that the hydraulic end capable of meeting the operation requirement for a long time is very necessary.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the plunger pump hydraulic end with long service life, and the valve box is separated from the plunger by the packing assembly, so that the service life of the valve box is prolonged; the service life of the suction gland is prolonged by changing the plane of the plunger and the end surface of the suction gland from the plane in the prior art into a cambered surface; the D-shaped seal and the L-shaped seal are adopted to replace the O-shaped seal, so that the turnover performance of the seal ring is reduced, the seal performance is improved, meanwhile, the seal ring is prevented from being abraded due to creeping in the operation process, and the service life is prolonged. The end faces of the suction pressure cap and the discharge pressure cap are provided with arc grooves from the complete plane in the prior art, so that the service life of the suction pressure cap and the discharge pressure cap is prolonged.

The aim of the invention is achieved by the following technical measures: the utility model provides a long-life plunger pump hydraulic end, plunger pump hydraulic end includes valve box, plunger and packing assembly, the valve box is as liquid transport's container, the plunger passes through the packing assembly and is connected with the valve box, the packing assembly includes the packing subassembly, and the packing cover presses the cap, and the cap is pressed to the packing cover, packing cover and valve box sealing connection fill between packing cover and plunger and are used for the packing subassembly of sealed, and the packing cover presses the cap to be used for fixed packing cover, and the packing presses the cap to be used for fixed packing subassembly.

The plunger pump comprises a plunger pump body, a plunger pump hydraulic end, a valve box liquid outlet, a valve assembly, a spring support, a suction pressure cap, a discharge pressure cap, a suction pressure cover, a discharge pressure cap, a spring support and a valve assembly.

Furthermore, one end face of the suction gland is an arc face, a protruding block extends out of the arc face, and the protruding block is used for connecting the spring support.

Further, the suction gland seal adopts a form of combining a D-shaped seal ring and an L-shaped seal ring.

Further, the D-shaped sealing ring is embedded on the suction gland.

Furthermore, the L-shaped sealing ring is embedded on the suction gland.

Furthermore, a first right-angle end is arranged on the suction gland, a second right-angle end is arranged on the valve box corresponding to the first right-angle end, the first right-angle end and the second right-angle end are matched for use, the second right-angle end is used for limiting the suction gland, and an L-shaped sealing ring is filled between the first right-angle end and the second right-angle end.

Further, one end of the L-shaped sealing ring is used for sealing between the first right-angle end and the second right-angle end in the vertical direction, and the other end of the L-shaped sealing ring is used for sealing between the first right-angle end and the second right-angle end in the axial direction.

Furthermore, an annular groove is formed in the end face of the suction pressure cap, and the groove is formed in one end, close to the suction pressure cover, of the groove.

Furthermore, an annular groove is formed in the end face of the discharge pressure cap, and the groove is formed in one end, close to the discharge pressure cap, of the groove.

Further, the cross section of the annular groove is arc-shaped.

Further, the discharge gland is sealed by a D-shaped sealing ring, and the discharge gland is embedded on the discharge gland in a sealing manner.

Further, the end of the plunger is an arc surface.

Furthermore, the packing sleeve and the valve box are sealed in a mode of combining a D-shaped sealing ring and a sealing gasket.

Furthermore, the packing sleeve is of a Z-shaped structure, a sinking platform is arranged on the valve box and used for limiting the packing sleeve, and a sealing gasket is filled between the sinking platform and the packing sleeve.

Compared with the prior art, the invention has the beneficial effects that: the valve box is separated from the plunger through the packing assembly, so that the service life of the valve box is prolonged; the service life of the suction gland is prolonged by changing the plane of the plunger and the end surface of the suction gland from the plane in the prior art into a cambered surface; the D-shaped seal and the L-shaped seal are adopted to replace the O-shaped seal, so that the turnover performance of the seal ring is reduced, the seal performance is improved, meanwhile, the seal ring is prevented from being abraded due to creeping in the operation process, and the service life is prolonged. The end faces of the suction pressure cap and the discharge pressure cap are provided with arc grooves from the complete plane in the prior art, so that the service life of the suction pressure cap and the discharge pressure cap is prolonged.

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is an overall cross-sectional view of the hydraulic end of the plunger pump.

Fig. 2 is a sectional view of the discharge cap or the suction cap.

Figure 3 is a cross-sectional view of the suction gland.

The automatic packing device comprises a valve box 1, a discharge pressing cap 2, a discharge pressing cover 3, a discharge pressing cover 4, a D-shaped sealing ring 5, a valve spring 6, a valve body 7, a valve seat 8, an L-shaped sealing ring 9, a suction pressing cover 10, a spring support 11, a plunger 12, a suction pressing cap 13, a sealing gasket 14, a packing spacer ring 15, a packing bag 16, a packing sleeve 17, a packing pressing ring 17, a set screw 18, a packing pressing cap 19, a packing sleeve pressing cap 20, a first right-angle end 21, a second right-angle end 22, a protruding block 23, an annular groove 24 and a sinking platform 25.

Detailed Description

As shown in fig. 1 to 3, a long-life plunger pump hydraulic end, plunger pump hydraulic end includes valve box 1, plunger 11 and packing assembly, valve box 1 is as the container of liquid transportation, plunger 11 passes through the packing assembly and is connected with valve box 1, the packing assembly includes the packing subassembly, packing cover 16, and the packing presses cap 19, and packing cover presses cap 20, packing cover 16 and valve box 1 sealing connection, it is concrete, adopt the mode that D type sealing washer 4 and sealed pad 13 combined together to seal between packing cover 16 and the valve box 1. The packing sleeve 16 is sealed by adopting a two-way sealing mode, the first sealing mode adopts a D-shaped sealing ring 4, and the sealing groove is formed in the valve box 1 to prevent fracturing sand from entering a gap between the packing sleeve 16 and the valve box 1, so that the packing sleeve 16 is convenient to replace in the later period. The second seal is a metal gasket 13 seal, and is used for sealing the high-pressure fluid in the valve box 1 and preventing the high-pressure fluid from leaking. Packing sleeve 16 is "Z" type structure, has seted up heavy platform 25 on valve box 1, heavy platform 25 is used for spacing packing sleeve 16, fills sealed pad 13 between heavy platform 25 and packing sleeve 16, can save the process of fluting on packing sleeve 16 and valve box 1, can conveniently fill the installation of sealed pad 13 again, can also play increase sealing area, better sealed to packing sleeve 16 and valve box 1.

Packing the packing subassembly that is used for sealing between packing cover 16 and plunger 11, packing cover pressure cap 20 is used for pressing the fixed packing cover 16 of fastening, and packing pressure cap 19 utilizes the screw to compress tightly the packing subassembly and fixes in packing cover 16, installs locking set screw 18 on packing cover pressure cap 20 simultaneously. The packing subassembly includes packing spacer ring 14, packing package 15 and packing clamping ring 17, packing spacer ring 14, packing package 15 and packing clamping ring 17 set gradually by interior and outside on packing cover 16. The valve box 1 is separated from the plunger 11 through the packing sleeve 16 in the packing assembly, and in the reciprocating motion of the plunger 11, only the packing sleeve 16 is worn by the packing assembly, so that compared with the prior art, the sealing failure caused by repeated and uninterrupted wear of the packing assembly on the valve box 1 is avoided, the packing assembly cannot be damaged by the wear and even puncture in the operation process, only the worn packing sleeve 16 needs to be replaced, and the service life of the valve box 1 is prolonged; the packing assembly and the packing sleeve 16 are compressed and fixed separately, and are compressed and fixed through the packing pressing cap 19 and the packing sleeve pressing cap 20 respectively, so that the packing assembly and the packing sleeve 16 can be compressed in a targeted manner according to different performance characteristics, namely, the plunger 11 can provide better sealing performance, the time for sealing maintenance is shortened, and the normal service life of the hydraulic end of the plunger pump is prolonged.

Further, the plunger pump hydraulic end also includes a suction pressure cap 12, a discharge pressure cap 2, a suction gland 9, a discharge gland 3, a suction gland 9 seal, a discharge gland 3 seal, a valve assembly and a spring support 10, wherein the liquid suction port and the liquid discharge port of the valve box 1 are respectively provided with the valve assembly for controlling liquid suction and discharge, the suction gland 9 is hermetically connected with the liquid suction port of the valve box 1 through the suction gland 9 seal, the suction pressure cap 12 is used for fixing the suction gland 9, the discharge gland 3 is connected with the valve assembly of the liquid discharge port of the valve box 1, the discharge gland 3 is hermetically connected with the liquid discharge port of the valve box 1 through the discharge gland 3 seal, the discharge pressure cap 2 is used for fixing the discharge gland 3, the valve assembly arranged at the liquid suction port of the valve box 1 is connected with the suction gland 9 through the spring support 10, the spring support 10 is used for limiting the valve assembly to prevent liquid pressure from impacting, the valve assembly rattles within the valve housing 1. (specifically, the spring holder 10 is connected to a valve spring 5 provided in the suction chamber). The valve assembly comprises a valve body 6, a valve seat 7, a valve spring 5 and the like, wherein one end of the valve body 6 is connected with the valve seat 7, and the other end of the valve body 6 is connected with the valve spring 5. The vertical direction in the valve box 1 is provided with two openings of a suction cavity and a discharge cavity, the horizontal direction is provided with two openings of a packing cavity and a suction gland 9 cavity, a liquid suction port corresponds to the suction cavity, a liquid discharge port corresponds to the discharge cavity, a valve spring 5 in the discharge cavity is connected with a discharge gland 3, a plunger 11 reciprocates in the packing cavity, and the suction gland 9 and a suction gland cap 12 are arranged in the suction gland 9 cavity.

Furthermore, one of the end surfaces of the suction gland 9 is an arc surface, a protruding block 23 extends from the arc surface, and the protruding block 23 is used for connecting the spring support 10. When the plunger 11 moves towards the suction gland 9 at a high speed in the packing cavity, fluid between the plunger 11 and the suction gland 9 is rapidly compressed, and the cambered surface of the suction gland 9 helps the fluid to be dispersed around in time, so that on one hand, stress of the suction gland 9 and the suction gland 12 can be reduced, and on the other hand, cavitation damage of the suction gland 9 and the valve box 1 is greatly reduced.

Further, the suction gland 9 is sealed by combining a D-shaped sealing ring 4 and an L-shaped sealing ring 8.

Further, the D-shaped sealing ring 4 is embedded on the suction gland 9. The L-shaped sealing ring 8 is embedded on the suction gland 9. Namely, a sealing groove is arranged on the suction gland 9, the D-shaped sealing ring 4 and the L-shaped sealing ring 8 are respectively filled in the respective sealing groove, and the D-shaped sealing ring 4 can effectively avoid the abrasion failure caused by the overturn of the O-shaped sealing ring in the sealing groove in the prior art.

The suction gland 9 is provided with a first right-angle end 21, the valve box 1 corresponding to the first right-angle end 21 is provided with a second right-angle end 22, the first right-angle end 21 and the second right-angle end 22 are matched for use, the second right angle is used for limiting the suction gland 9, and an L-shaped sealing ring 8 is filled between the first right-angle end 21 and the second right-angle end 22.

One end of the L-shaped sealing ring 8 is used for sealing between the first right-angle end 21 and the second right-angle end 22 in the vertical direction, and the other end of the L-shaped sealing ring 8 is used for sealing between the first right-angle end 21 and the second right-angle end 22 in the axial direction. Through the cooperation of first right angle end 21 and second right angle end 22 to and fill L type sealing washer 8 between first right angle end 21 and second right angle end 22, can reach 100% appearance clearance and fill up, realize sucking gland 9 and valve box 1 better sealed, avoid L type sealing washer 8 quick wriggling in the seal groove and wearing and tearing valve box 1.

An annular groove 24 is formed in the end face of the suction cap 12, and the groove is formed in one end close to the suction gland 9.

An annular groove 24 is formed in the end face of the discharge gland 2, and the groove is formed in one end, close to the discharge gland 3.

The cross-section of the annular groove 24 is arc-shaped. The arc-shaped concave contact can enable the force on the suction pressure cap 12 and the discharge pressure cap 2 to be transmitted backwards, so that the threads on the suction pressure cap 12 and the discharge pressure cap 2 are stressed uniformly, and the service lives of the suction pressure cap 12 and the discharge pressure cap 2 are prolonged.

The discharge gland 3 is sealed by a D-shaped sealing ring 4, and the discharge gland 3 is embedded on the discharge gland 3 in a sealing manner.

The end of the plunger 11 is a cambered surface. When the plunger 11 moves towards the suction gland 9 at a high speed in the packing cavity, fluid between the plunger 11 and the suction gland 9 is rapidly compressed, the cambered surface of the plunger 11 helps the fluid to be dispersed around in time, on one hand, stress of the suction gland 9 and the suction gland 12 can be reduced, and on the other hand, cavitation damage of the plunger 11 and the valve box 1 is greatly reduced.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.