阅读说明：本技术 一种柱塞泵液力端 (Plunger pump hydraulic end ) 是由 李晓斌 姜琛 郭子蒙 李朋 王继鑫 李海龙 于 2020-07-17 设计创作，主要内容包括：本发明公开了一种柱塞泵液力端,包括阀箱以及设在阀箱内的柱塞,盘根密封总成,凡尔总成,凡尔弹簧座,排出压盖,排出压帽,吸入压盖和吸入压帽,凡尔弹簧座包括凸起,连接件和翅片,所述连接件分别与凸起和翅片连接,所述翅片为2个,2个翅片相对设置,在所述阀箱上开设有容置腔,所述容置腔用于容置翅片。有益效果：通过改变凡尔弹簧座的结构,以及凡尔弹簧座与阀箱的安装固定方式,安装拆卸更简单快捷,同时提高了液力端使用寿命。将柱塞与吸入压盖端面改为弧面,便于内部流体流动。通过增加限位凸起可以防止凡尔弹簧座左右旋转脱落。将第一密封圈和第二密封圈都设在阀箱上,使磨损转移到易损件上,提升了阀箱的使用寿命。(The invention discloses a hydraulic end of a plunger pump, which comprises a valve box, a plunger, a packing seal assembly, a valve spring seat, a discharge gland, a discharge pressure cap, a suction gland and a suction pressure cap, wherein the plunger, the packing seal assembly, the valve spring seat, the discharge gland, the discharge pressure cap, the suction gland and the suction pressure cap are arranged in the valve box, the valve spring seat comprises a bulge, a connecting piece and fins, the connecting piece is respectively connected with the bulge and the fins, the number of the fins is 2, the 2 fins are oppositely arranged, an accommodating cavity is formed in the valve box, and the accommodating cavity. Has the advantages that: through the structure that changes the valve spring seat to and the installation fixed mode of valve spring seat and valve box, the installation is dismantled more simply swiftly, has improved hydraulic end life simultaneously. The end faces of the plunger and the suction gland are changed into cambered surfaces, so that internal fluid can flow conveniently. The valve spring seat can be prevented from falling off in a left-right rotating mode by adding the limiting protrusions. The first sealing ring and the second sealing ring are arranged on the valve box, so that abrasion is transferred to a quick-wear part, and the service life of the valve box is prolonged.)

1. A plunger pump fluid end which characterized in that: the valve box comprises a valve box, a plunger, a packing seal assembly, a valve spring seat, a discharge gland, a discharge pressure cap, a suction gland and a suction pressure cap, wherein a suction cavity and a discharge cavity are arranged in the valve box in the vertical direction, a packing cavity and a suction pressure cap cavity are arranged in the valve box in the horizontal direction, the valve assembly and the valve spring seat are arranged in the suction cavity, the valve assembly is connected with the valve spring seat, the valve assembly, the discharge gland and the discharge pressure cap are sequentially arranged in the discharge cavity from inside to outside, the valve assembly is connected with the discharge gland, the discharge pressure cap is used for pressing the discharge gland, a column plug in the packing cavity is hermetically connected with the valve box through the packing seal assembly, the suction gland and the suction pressure cap are arranged in the suction pressure cap cavity, the valve spring seat comprises a bulge, a connecting piece and a fin, the bottom of the connecting piece is connected with the bulge, and the bulge is connected with the valve assembly in the discharge cavity, the upper portion of connecting piece is connected with the fin, the fin is 2, and 2 fins set up relatively set up seted up the holding chamber on the valve box, the holding chamber is used for the holding fin.

2. The plunger pump fluid end of claim 1, wherein: the cross section of the fin is a conical surface.

3. The plunger pump fluid end of claim 1, wherein: the end face of the plunger is arc-shaped.

4. The plunger pump fluid end of claim 3 wherein: the end face of the plunger is in an outer arc shape.

5. The plunger pump fluid end of claim 1, wherein: the end surface of the suction gland is arc-shaped.

6. The plunger pump fluid end of claim 5 wherein: the end surface of the suction gland is in an inner arc shape.

7. The plunger pump fluid end of claim 6 wherein: a limiting bulge extends from the arc-shaped end surface in the suction gland and is used for limiting a fin of the valve spring seat.

8. The plunger pump fluid end of claim 1, wherein: the discharge gland is connected with the valve box in a sealing mode through a first sealing ring, and the first sealing ring is embedded on the valve box.

9. The plunger pump fluid end of claim 8 wherein: the first sealing ring is a D-shaped sealing ring.

10. The plunger pump fluid end of claim 1, wherein: the suction gland is connected with the valve box in a sealing mode through a second sealing ring, and the second sealing ring is embedded on the valve box.

11. The plunger pump fluid end of claim 10 wherein: the second sealing ring is a D-shaped sealing ring.

Technical Field

The invention relates to the technical field of a hydraulic end of a plunger pump, in particular to a hydraulic end of a plunger pump.

Background

At present, oil and gas field exploitation fracturing construction is used as a main yield increasing mode, wherein a plunger pump is used as a core component of the whole fracturing equipment, and the service life of the plunger pump needs to be continuously prolonged to meet the requirement of long-time fracturing operation. The service life of a hydraulic end in the plunger pump is the key point influencing construction, fracturing fluid or sand carrying fluid enters through a low-pressure port of the hydraulic end, and media in a valve box of the hydraulic end are pressurized in the reciprocating motion of the plunger and enter the bottom of a well through a high-pressure pipeline. In the operation process, the main damage form of hydraulic end is that the valve box appears the fracture and the sealed face wearing and tearing of valve box, if high-pressure liquid reveals, all has very big influence to personal safety and operating efficiency. Through analysis, the valve box is mainly because the valve box inner wall is fluted and leads to intersecting line department to produce great stress, and the valve box sealed face is because the sealing washer produces wearing and tearing and inefficacy to the valve box fast wriggling under the liquid alternating load effect. Both of these issues must be addressed to increase the useful life of the fluid end.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the hydraulic end of the plunger pump, which realizes simpler and quicker installation and disassembly by changing the structure of the valve spring seat and the installation and fixing modes of the valve spring seat and the valve box and also prolongs the service life of the hydraulic end. 2. The end faces of the plunger and the suction gland are changed into cambered surfaces, so that internal fluid can flow conveniently. 3. The valve spring seat can be prevented from falling off in a left-right rotating manner by adding the limiting bulge on the suction gland. 4. The first sealing ring and the second sealing ring are arranged on the valve box, so that abrasion is transferred to wearing parts (a suction gland and a discharge gland), and the service life of the valve box is prolonged.

The aim of the invention is achieved by the following technical measures: a plunger pump hydraulic end comprises a valve box, a plunger, a packing seal assembly, a valve spring seat, a discharge gland, a discharge pressure cap, a suction gland and a suction pressure cap, wherein a suction cavity and a discharge cavity are arranged in the valve box in the vertical direction, a packing cavity and a suction pressure cap cavity are arranged in the valve box in the horizontal direction, the valve assembly and the valve spring seat are arranged in the suction cavity and are connected with the valve spring seat, the valve assembly, the discharge gland and the discharge pressure cap are sequentially arranged in the discharge cavity from inside to outside, the valve assembly is connected with the discharge gland, the discharge pressure cap is used for pressing the discharge gland, a column plug in the packing cavity is hermetically connected with the valve box through the packing seal assembly, the suction gland and the suction pressure cap are arranged in the suction pressure cap cavity, the valve spring seat comprises a bulge, a connecting piece and a fin, the bottom of the connecting piece is connected with the bulge, and the bulge is connected with the valve assembly in the discharge cavity, the upper portion of connecting piece is connected with the fin, the fin is 2, and 2 fins set up relatively set up seted up the holding chamber on the valve box, the holding chamber is used for the holding fin.

Further, the cross section of the fin is a conical surface.

Further, the end face of the plunger is arc-shaped.

Further, the end face of the plunger is in an outer arc shape.

Further, the end face of the suction gland is arc-shaped.

Further, the end face of the suction gland is in an inner arc shape.

Furthermore, a limiting bulge extends from the arc-shaped end surface in the suction gland and is used for limiting the fin of the valve spring seat.

Further, discharge gland and valve box pass through first sealing washer sealing connection, first sealing washer is inlayed on the valve box.

Further, the first sealing ring is a D-shaped sealing ring.

Further, the suction gland is connected with the valve box in a sealing mode through a second sealing ring, and the second sealing ring is embedded on the valve box.

Further, the second sealing ring is a D-shaped sealing ring.

Compared with the prior art, the invention has the beneficial effects that: 1. through the structure that changes the valve spring seat to and the installation fixed mode of valve spring seat and valve box, realized both installation dismantlements simple more swiftly, more importantly, reduce the stress of horizontal direction and vertical direction cavity intersecting line department in the valve box, improve hydraulic end life. 2. The end faces of the plunger and the suction gland are changed into cambered surfaces, so that internal fluid can flow conveniently. 3. The valve spring seat can be prevented from falling off in a left-right rotating manner by adding the limiting bulge on the suction gland. 4. The first sealing ring and the second sealing ring are arranged on the valve box, so that abrasion is transferred to wearing parts (a suction gland and a discharge gland), and the service life of the valve box is prolonged.

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

Drawings

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

Fig. 2 is a schematic structural view of a valve spring seat.

Fig. 3 is a schematic structural view of the installation of the valve spring seat and the valve box accommodating cavity.

Figure 4 is a cross-sectional view of the suction gland.

The valve comprises a valve box 1, a plunger 2, a packing seal assembly 3, a valve assembly 4, a valve spring seat 5, a discharge gland 6, a discharge gland 7, a discharge gland 8, a suction gland 9, a suction gland 10, a first sealing ring 11, a second sealing ring 12, a fin 13, a bulge 14, a connecting piece 15, an accommodating cavity 16, a limiting bulge 17 and a through hole 17.

Detailed Description

As shown in fig. 1 to 4, a plunger pump hydraulic end comprises a valve box 1, a plunger 2, a packing seal assembly 3, a valve assembly 4, a valve spring seat 5, a discharge gland 6, a discharge gland 7, a suction gland 8 and a suction gland 9, wherein a suction cavity and a discharge cavity are arranged in the valve box 1 in the vertical direction, a packing cavity and a suction gland 8 cavity are arranged in the valve box 1 in the horizontal direction, the valve assembly 4 and the valve spring seat 5 are arranged in the suction cavity, the valve assembly 4 is connected with the valve spring seat 5, the valve assembly 4, the discharge gland 6 and the discharge gland 7 are arranged in the discharge cavity from inside to outside in sequence, the valve assembly 4 is connected with the discharge gland 6, the discharge gland 7 is used for pressing the discharge gland 6, the plunger 2 is connected with the valve box 1 in the packing cavity through the packing seal assembly 3, the suction gland 8 and the suction gland 9 are arranged in the suction gland 8 cavity, the valve spring seat 5 comprises a protrusion 13, a connecting piece 14 and fins 12, the bottom of the connecting piece 14 is connected with the protrusion 13, the protrusion 13 is connected with the valve assembly 4 in the discharge cavity, the upper portion of the connecting piece 14 is connected with the fins 12, the number of the fins 12 is 2, the fins 12 are arranged oppositely, a containing cavity 15 is formed in the valve box 1, and the containing cavity 15 is used for containing the fins 12. The valve assembly 4 comprises a valve body, a valve seat and a valve spring, one end of the valve body is connected with the valve spring, and the other end of the valve body is connected with the valve seat. In the outlet chamber, a valve spring is connected to the outlet gland 6. The valve spring in the suction chamber is connected to a valve spring seat 5. The packing seal assembly 3 comprises a packing spacer ring, a packing bag, a packing press ring, a packing press cap and the like. The valve assembly 4 in the suction chamber and the discharge chamber functions as a check valve for sucking a low pressure liquid and discharging a high pressure liquid. The plunger 2 horizontally reciprocates in the packing cavity. The valve spring seat 5 is used for limiting the valve spring of the suction cavity. Valve spring seat 5 in this application simple structure, it is very convenient with the dismouting of valve box 1, it is complicated to have avoided the installation of valve spring seat 5 among the prior art, need not to set up the slotted hole on valve box 1 promptly, need not to insert valve spring seat 5 into the slotted hole, just can realize the fixed of valve spring seat 5, reduces the stress of horizontal direction and vertical direction cavity intersecting line department in the valve box 1, improves fluid end life.

The cross section of the fin 12 is a conical surface. The design of the conical fin 12 can well fix the valve spring seat 5 on the valve box 1 to play a role in limiting.

The end surface of the plunger 2 is arc-shaped. Specifically, the end surface of the plunger 2 is in an outer arc shape. When the plunger 2 moves towards the suction gland 8 at a high speed in the packing cavity, fluid between the plunger 2 and the suction gland 8 is rapidly compressed, the cambered surface of the plunger 2 helps the fluid to be dispersed around in time, on one hand, stress of the suction gland 8 and the suction gland 9 can be reduced, and on the other hand, cavitation damage of the plunger 2 and the valve box 1 is greatly reduced.

The end surface of the suction gland 8 is arc-shaped. The end surface of the suction gland 8 is in an inner arc shape.

A limiting bulge 16 extends from the inner arc-shaped end surface of the suction gland 8, the limiting bulge 16 is used for limiting the fin 12 of the valve spring seat 5, and the valve spring seat 5 is prevented from rotating and being separated from the accommodating cavity 15 under the impact of liquid.

The limiting protrusion 16 may be a small segment of ring shape, or may be a complete ring shape, and when the limiting protrusion is a ring shape, a through hole 17 may be formed on the limiting protrusion 16. The through hole 17 is convenient for the circulation of the sucked fluid, avoids the sucked fluid from impacting the limiting bulge 16 in the pressurizing process, simultaneously reduces the change of the fluid flow direction as much as possible, avoids the impact of the fluid diversion on the suction gland 8 and the valve box 1, and also protects the suction gland 8 and the valve box 1 in the diversion way.

The discharge gland 6 is connected with the valve box 1 in a sealing mode through a first sealing ring 10, and the first sealing ring 10 is embedded on the valve box 1. The first seal ring 10 is a D-shaped seal ring. The suction gland 8 is connected with the valve box 1 in a sealing mode through a second sealing ring 11, and the second sealing ring 11 is embedded on the valve box 1. The second sealing ring 11 is a D-shaped sealing ring. The first sealing ring 10 and the second sealing ring 11 are arranged on the valve box 1, so that abrasion is transferred to wearing parts (the suction gland 8 and the discharge gland 6), and under the action of high-pressure alternating load, the first sealing ring 10 and the second sealing ring 11 respectively abrade the suction gland 8 and the discharge gland 6 without abrading the valve box 1, thereby protecting the sealing surface of the valve box 1 and prolonging the service life of the valve box 1.

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.