CN215860749U

CN215860749U - Packing subassembly, hydraulic end and plunger pump

Info

Publication number: CN215860749U
Application number: CN202122318121.9U
Authority: CN
Inventors: 姜琛; 李晓斌; 张树林; 李朋; 王继鑫
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-18
Anticipated expiration: 2031-09-24
Also published as: WO2023045019A1

Abstract

A packing assembly, fluid end and plunger pump are provided. This packing package subassembly includes: a spacer ring; the compression ring and the spacer ring are arranged along the extension direction of the axis of the packing assembly; the sealing assembly is positioned between the spacer ring and the pressure ring; the seal assembly includes a first packing ring in at least partial contact with the spacer ring, one of a surface of the first packing ring proximate the spacer ring and a surface of the spacer ring proximate the first packing ring including a protrusion, the other of the surface of the first packing ring proximate the spacer ring and the surface of the spacer ring proximate the first packing ring including a recess, the protrusion at least partially located within the recess. The packing package assembly, the hydraulic end and the plunger pump are wear-resistant.

Description

Packing subassembly, hydraulic end and plunger pump

Technical Field

At least one embodiment of the utility model relates to a packing assembly, a fluid end, and a plunger pump.

Background

Hydraulic fracturing construction is becoming the main stimulation treatment of oil fields, and fracturing fluid (including sand carrying fluid) is pumped to the bottom of a well under the action of high pressure to realize fracturing operation, so that the yield of oil and gas is increased. The key component of this construction is the plunger pump that produces the high pressure fracturing fluid.

For example, a plunger pump is composed of two parts, a power end and a fluid end.

SUMMERY OF THE UTILITY MODEL

At least one embodiment of the utility model relates to a packing assembly, a fluid end and a plunger pump, and at least one embodiment of the utility model also relates to a transition piece, a fluid end and a plunger pump.

In one aspect, at least one embodiment of the utility model is directed to a packing assembly, fluid end, and plunger pump to resist wear.

At least one embodiment of the present invention provides a packing box assembly comprising: a spacer ring; the compression ring and the spacer ring are arranged along the extension direction of the axis of the packing assembly; the sealing assembly is positioned between the spacer ring and the pressure ring; the seal assembly includes a first packing ring in at least partial contact with the spacer ring, one of a surface of the first packing ring proximate the spacer ring and a surface of the spacer ring proximate the first packing ring including a protrusion, the other of the surface of the first packing ring proximate the spacer ring and the surface of the spacer ring proximate the first packing ring including a recess, the protrusion at least partially located within the recess.

For example, the convex portion and the concave portion are at least partially in contact.

For example, a cross-section of a contact surface of the first packing ring with the spacer ring in a plane passing through the axis includes at least one of a V-shape, an arc shape, a wave shape, and a saw-tooth shape.

For example, one of a surface of the first packing ring adjacent the spacer ring and a surface of the spacer ring adjacent the first packing ring includes a plurality of recesses, and the other of the surface of the first packing ring adjacent the spacer ring and the surface of the spacer ring adjacent the first packing ring includes a plurality of protrusions, the plurality of recesses and the plurality of protrusions mating.

For example, the surface of the spacer ring opposite to the surface in contact with the first packing ring has a seal groove in which a seal ring is disposed.

For example, the seal assembly further includes two second packing rings, and the pressure ring, the two second packing rings, the first packing ring, and the spacer ring are arranged along an extension of the axis of the packing assembly.

For example, a cross-section of a contact surface of the first packing ring and its adjacent second packing ring, a contact surface of the two second packing rings, and a contact surface of the pressure ring and its adjacent second packing ring in a plane passing through the axis includes at least one of a V-shape, an arc shape, a wave shape, and a saw-tooth shape.

At least one embodiment of the utility model also provides a hydraulic end, which comprises any packing set assembly.

For example, the fluid end further comprises: a valve housing including a packing cavity configured to receive the packing pack assembly; the packing is pressed the cap, is configured to compress tightly packing package subassembly to and the converting part, set up the valve box with the packing is pressed between the cap, be configured to connect the valve box with the packing is pressed the cap, the material of converting part with the material of valve box is different.

For example, the transition piece has a hardness greater than that of the valve housing.

For example, the outer end face of the transition piece is fixedly connected with the valve box by welding.

For example, the outer end face of the transition piece is flush with the end face of the valve housing.

For example, the conversion part comprises an internal thread and an external thread, the conversion part is connected with the valve box through a thread, and the conversion part is connected with the packing pressing cap through a thread.

For example, the conversion element includes a main body portion and an extension portion at a first end of the main body portion, the extension portion protruding from the main body portion toward an axis of the conversion element.

For example, the converting element further includes a plurality of recesses at a second end of the body portion, the first end and the second end being opposite ends of the converting element, the plurality of recesses being evenly distributed.

At least one embodiment of the utility model also provides a plunger pump, which comprises any one of the hydraulic ends.

In another aspect, at least one embodiment of the present invention relates to a transition piece, a fluid end, and a plunger pump to prevent the valve box and packing gland from becoming unusable due to thread binding galling.

At least one embodiment of the present invention provides a conversion element that is cylindrical and includes a channel extending from a first end of the conversion element to a second end of the conversion element, the first end and the second end being opposite ends of the conversion element, the conversion element including a body portion, an inner surface of the body portion including internal threads, and an outer surface of the body portion including external threads.

For example, the conversion element further includes an extension at the first end of the main body portion, the extension protruding from the main body portion toward an axis of the conversion element.

For example, a dimension of the extension portion in a radial direction of the conversion member is larger than a dimension of the main body portion in the radial direction of the conversion member and is smaller than twice the dimension of the main body portion in the radial direction of the conversion member.

For example, the conversion element further includes a plurality of recesses at the second end of the body portion, the plurality of recesses being evenly distributed.

At least one embodiment of the present invention provides a fluid end, comprising: the valve box comprises a packing cavity; a packing pack assembly located in the packing cavity; the packing presses the cap, at least part is located in the packing chamber and is configured as the orientation the valve box is inside to compress tightly packing package subassembly to and the converting part, set up the inner wall in the packing chamber of valve box with between the packing presses the cap, in order with the valve box with the packing is pressed the cap and is connected, the converting part is the cylindric and includes the follow the first end of converting part extends to the passageway of the second end of converting part, the converting part includes the main part, the internal surface of main part includes the internal thread, the surface of main part includes the external screw thread, the material of converting part with the material of valve box is different.

For example, the valve housing may be made of stainless steel.

For example, the thermal conductivity of the transition piece is greater than the thermal conductivity of the valve housing.

For example, the conversion element is a circular ring-shaped structural element.

For example, the conversion part is connected with the valve box through the external thread, and the conversion part is connected with the packing gland through the internal thread.

For example, the fluid end further includes a plunger, and the valve housing further includes a plunger cavity, the plunger being disposed in the plunger cavity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

FIG. 1 is a schematic diagram of a hydraulic tip.

FIG. 2 is a schematic view of the packing assembly of the fluid end of FIG. 1.

Fig. 3 is a schematic diagram of a packing set assembly according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a fluid end including the packing set assembly shown in FIG. 3 according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a packing set assembly according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a fluid end including the packing set assembly shown in FIG. 5 according to an embodiment of the present invention.

Fig. 7 is a partial schematic view of a hydraulic terminal according to an embodiment of the utility model.

Fig. 8 is a perspective view of a converter according to an embodiment of the utility model.

Fig. 9 is a partial schematic view of a hydraulic terminal according to an embodiment of the utility model.

Fig. 10 is a perspective view of a conversion member according to another embodiment of the present invention.

Detailed Description

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

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Likewise, 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. The terms "connected" or "coupled" and the like include physical or mechanical connections, whether direct or indirect. "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.

In one aspect, the present invention addresses the problem of the valve housing 101 and packing set 103 being susceptible to wear and provides a wear-resistant packing set, a fluid end containing the packing set, and a plunger pump containing the fluid end.

FIG. 1 is a partial schematic view of a hydraulic tip. As shown in fig. 1, the hydraulic end includes a valve housing 101, a plunger 102, a packing set assembly 103, and a packing gland 104. For example, the material of the valve housing 101 includes stainless steel. The packing gland 104 is an important part in the hydraulic end, and mainly functions to tightly press the packing pack assembly 103 in the packing cavity of the valve box 101 through a threaded structure, so that when the plunger 102 reciprocates rapidly, high-pressure hydraulic sealing at the plunger can be realized. For example, the plunger 102 may reciprocate within the plunger cavity to cause the hydraulic end of the plunger pump to draw in low pressure fluid and expel high pressure fluid. For example, the packing set assembly 103 is located in the packing cavity. For example, the packing cavity is configured to receive a packing set assembly. For example, the packing gland 104 is at least partially positioned in the packing cavity and is configured to compress the packing pack assembly 103 toward the interior of the valve housing 101.

In the operation process, a crank link mechanism in the power end drives a plunger in the hydraulic end to reciprocate, a packing pressing cap 104 can lock a packing package assembly 103 (packing sealing assembly) in the hydraulic end, and when the plunger continuously reciprocates, the sealing of high-pressure fluid at the plunger can be realized.

FIG. 2 is a schematic view of the packing assembly of the fluid end of FIG. 1. For example, as shown in fig. 1 and 2, the packing assembly 103 includes a seal assembly 1031, a spacer ring 1032, and a pressure ring 1033. For example, as shown in fig. 2, the pressure ring 1033 and the spacer ring 1032 are aligned in the direction of extension of the packing set axis C0.

For example, as shown in fig. 2, seal assembly 1031 includes a first packing ring 1031a and a second packing ring 1031 b. Fig. 2 illustrates an example where the seal assembly 1031 includes a first packing ring 1031a and two second packing rings 1031 b. For example, first ring 1031a has a hardness that is less than the hardness of second ring 1031 b. For example, first disk root ring 1031a is a flexible disk root ring, and second disk root ring 1031b is a hard disk root ring. For example, the material of first disc root ring 1031a includes rubber. For example, the material of second radicular ring 1031b includes rubber containing fibers. For example, second radicular ring 1031b includes a cloth-sandwiched rubber. The material of first radicle ring 1031a and the material of second radicle ring 1031b are not limited to the above examples, and may be determined as necessary.

As shown in fig. 1 and 2, packing package subassembly 103 is installed in the packing chamber of valve box 101, and the plunger setting is in the plunger chamber of valve box 101, and in the operation process, plunger 102 can carry out reciprocating motion fast, produces alternating load in the cavity, and the surface that cap 104 was pressed to the packing is the helicitic texture, screws through the screw and compresses tightly packing package subassembly 103 in the packing intracavity of valve box 101, seals the high-pressure liquid of plunger department, prevents to reveal.

However, the packing set assembly 103 has the following disadvantages or shortcomings when in use: as shown in fig. 1 and 2, because of the fracturing operation, a sand-carrying fracturing fluid is in the cavity of the valve box 101, in the operation process, fracturing sand enters a gap between the packing assembly 103 and the valve box 101 through a gap between the valve box 101 and the spacer ring 1032 and a gap between the spacer ring 1032 and the first packing ring 1031a (a flexible packing ring), because alternating load is continuously and rapidly generated in the cavity of the valve box 101, the packing assembly 103 also continuously moves left and right, the packing assembly 103 is worn and cannot be used after being used for a period of time, and the packing assembly 103 needs to be replaced. After the packing package 103 is replaced many times, due to abrasion, the inner wall of the valve box 101 is severely sunken, and in this case, even if a new packing package assembly is replaced, high-pressure liquid in the valve box cannot be well sealed, so that the valve box cannot be used.

Fig. 3 is a schematic diagram of a packing set assembly according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a fluid end including the packing set assembly shown in FIG. 3 according to an embodiment of the present invention.

As shown in fig. 3 and 4, the packing assembly 203 includes a seal assembly 2031, a spacer ring 2032, and a pressure ring 2033. For example, as shown in fig. 3 and 4, the pressure ring 2033 and the spacer ring 2032 are aligned along the extension direction of the axis C0 of the packing assembly 203. For example, as shown in fig. 3 and 4, the seal assembly 2031 comprises a first root ring 2031 a. For example, first root ring 2031a is adjacent spacer ring 2032. For example, the element a and the element B are adjacent to each other means that no other element a and no other element B are provided between the element a and the element B. For example, first root ring 2031a is in at least partial contact with spacer ring 2032. In order to make the packing assembly and the fluid end containing the packing assembly wear resistant, the contact surface of the first packing ring 2031a and the spacer ring 2032 is V-shaped, forming a wear resistant packing assembly and a wear resistant fluid end.

As shown in fig. 3 and 4, the surface of the first packing ring 2031a that contacts the spacer ring 2032 is V-shaped, the surface of the spacer ring 2032 that contacts the first packing ring 2031a is V-shaped, and the contact surface of the first packing ring 2031a and the spacer ring 2032 is V-shaped, so that the contact area can be increased, thereby preventing fracturing sand in liquid from entering into the gap between the valve box 101 and the packing assembly 103 during operation, avoiding abrasion of the valve box 101 and the packing assembly 103 due to long-term use, and prolonging the service life. The service life of the valve box 101 and the packing package assembly 203 is prolonged, the frequency of field maintenance can be reduced, the operation efficiency is improved, and the valve box and the packing package assembly play an important role in safe and stable operation of equipment.

For example, as shown in fig. 4, the spacer ring 2032 functions to separate the seal assembly 2031 from the valve housing 101 in the first direction X, and the compression ring 2033 functions to compress the seal assembly 2031. For example, the spacer ring 2032 and the compression ring 2033 may be made of metal or plastic material. For example, the metal may include copper and the plastic may include Polyetheretherketone (PEEK), but is not limited thereto, and the spacer ring 2032 and the compression ring 2033 may be selected from suitable materials as needed.

For example, as shown in fig. 3 and 4, in order to prevent the entry of the fracturing sand in the liquid into the gap between the valve box 101 and the packing assembly 103 during the operation, the surface of the spacer ring 2032 opposite to the surface in contact with the first packing ring 2031a has a seal groove (groove) 320, and a seal ring 121 is provided in the seal groove 320. The sealing ring 121 is arranged in the sealing groove 320 of the spacer ring 2032, so that the valve box 101 and the packing pack assembly 103 are prevented from being worn by fracturing sand entering a gap between the valve box 101 and the packing pack assembly 103, the service life is prolonged, the frequency of field maintenance is reduced, the operation efficiency is improved, and the safe and stable operation of equipment is facilitated.

For example, as shown in fig. 3 and 4, in order to prevent the crack sand in the liquid from entering into the gap between the valve box 101 and the packing set 103 during the operation to wear the valve box 101 and the packing set 103, the sealing assembly 2031 further comprises a second packing ring 2031 b. Fig. 2 illustrates the seal assembly 2031 comprising a first packing ring 2031a and two second packing rings 2031 b. For example, the hardness of first packing ring 2031a is less than the hardness of second packing ring 2031 b. For example, the first root ring 2031a is a flexible disk root ring, and the second root ring 2031b is a hard disk root ring.

For example, in some embodiments, the cross-section of the contact face of a first root ring 2031a and its adjacent second root ring 2031b, the contact face of two second root rings 2031b, the contact face of compression ring 2033 and its adjacent second root ring 2031b in a plane through axis C0 includes at least one of a V-shape, an arc-shape, an undulated shape, and a saw-tooth shape. The shape of the contact surface is not limited to the above given case as long as the shape can increase the area of the contact surface.

For example, as shown in fig. 3 and 4, in order to prevent the fracturing sand in the liquid from entering into the gap between the valve box 101 and the packing assembly 103 during the operation and wearing the valve box 101 and the packing assembly 103, the contact surface between the first packing ring 2031a and the second packing ring 2031b is V-shaped.

For example, as shown in fig. 3 and 4, in order to prevent the fracturing sand in the liquid from entering into the gap between the valve box 101 and the packing assembly 103 to wear the valve box 101 and the packing assembly 103 during the operation, the contact surfaces of the two second packing rings 2031b are V-shaped, but other shapes that can increase the contact surfaces may be adopted.

For example, as shown in fig. 3 and 4, in order to prevent the fracturing sand in the liquid from entering into the gap between the valve box 101 and the packing assembly 103 to wear the valve box 101 and the packing assembly 103 during the operation, the contact surface between the pressing ring 203 and the second packing ring 2031b is V-shaped.

For example, when the packing device is used, the seal ring 121 is first installed in the seal groove 320 of the spacer ring 2032, the spacer ring 2032 with the seal ring 121 is then installed in the packing cavity of the valve box 101, and then the first packing ring 2031a, the second packing ring 2031b and the compression ring 2033 are sequentially installed, and finally the packing gland 104 is used to compress the whole packing assembly 103 in the packing cavity, and then the plunger 102 is installed, so that the plunger 102 can seal the internal high-pressure liquid when reciprocating.

Fig. 5 is a schematic diagram of a packing set assembly according to another embodiment of the present invention. FIG. 6 is a schematic diagram of a fluid end including the packing set assembly shown in FIG. 5 according to an embodiment of the present invention. The packing set assembly 203 shown in fig. 5 differs from the packing set assembly 203 shown in fig. 3 in that: in the case where the contact surface between the first packing ring 2031a and the spacer ring 2032 is zigzag, and the spacer ring 2032 in the packing assembly 203 shown in fig. 5 is not provided with a seal groove, as shown in fig. 6, the seal groove 320 may be provided in the valve housing 101.

Fig. 3 to 6 show the first direction X and the second direction Y. The first direction X is perpendicular to the second direction Y. The first direction X may be an axial direction and the second direction Y may be a radial direction.

As shown in fig. 3 to 6, one of the surface S1 of the first packing ring 2031a adjacent to the spacer ring 2032 and the surface S2 of the spacer ring 2032 adjacent to the first packing ring 2031a includes a protrusion PT1, and the other of the surface S1 of the first packing ring 2031a adjacent to the spacer ring 2032 and the surface S2 of the spacer ring 2032 adjacent to the first packing ring 2031a includes a recess PT2, and the protrusion PT1 is at least partially located in the recess PT2, so that, when the packing assembly 203 is moved to the left or right, even if the first packing ring 2031a and the spacer ring 2032 are slightly separated, the first packing ring 1a and the spacer ring 2032 are still in contact, thereby preventing the valve box 101 and the packing assembly 103 from being worn by fracturing sand in the liquid entering the gap between the valve box 101 and the packing assembly 103 during operation. The axis C0 of the packing set assembly 203 extends in the first direction X. For example, the space between the first packing ring 2031a and the spacer ring 2032 is smaller than the maximum size of the contact surface between the first packing ring 2031a and the spacer ring 2032 in the extending direction of the axis C0 of the packing assembly 203, so that the function of preventing the entry of the fracturing sand in the liquid into the gap between the valve box 101 and the packing assembly 103 can be achieved. In the case where first root ring 2031a and spacer ring 2032 are spaced apart, surface S1 of first root ring 2031a near spacer ring 2032 and surface S2 of spacer ring 2032 near first root ring 2031a are not in full contact as shown in fig. 3, but rather have a certain spacing between the top end of projection PT1 and the bottom end of recess PT2, but both sides of the top end of projection PT1 and both sides of the bottom end of recess PT2 are in contact. That is, during plunger movement, surface S1 of first root ring 2031a adjacent spacer 2032 and surface S2 of spacer 2032 adjacent first root ring 2031a are at least partially in contact.

For example, as shown in fig. 3-6, the convex PT1 and concave PT2 mate.

For example, as shown in fig. 5 and 6, one of surface S1 of first root ring 2031a adjacent spacer ring 2032 and surface S2 of spacer ring 2032 adjacent first root ring 2031a includes a plurality of protrusions PT1, the other of surface S1 of first root ring 2031a adjacent spacer ring 2032 and surface S2 of spacer ring 2032 adjacent first root ring 2031a includes a plurality of recesses PT2, and the plurality of protrusions PT1 and the plurality of recesses PT2 mate. For example, in the case where the contact surface between the first root ring 2031a and the spacer ring 2032 is zigzag, the first root ring includes a plurality of protrusions PT1 and a plurality of recesses PT 2.

For example, as shown in fig. 3-6, the axis C0 of the packing set assembly 203 may coincide with the axis of the plunger 102. For example, the axis C0 of the packing set assembly 203 may coincide with the axis of the plunger cavity, for example.

For example, as shown in fig. 3-6, the axis C0 of the packing set 203 may be the centerline C0 of the packing set 203.

For example, as shown in fig. 3-6, the centerline C0 of the packing set 203 may be a line connecting the centers of at least two elements of the packing set 203. Each element of the packing assembly 203 is annular. For example, the center of each component in the packing set 203 is the center of the circle of the component.

As shown in fig. 3 to 6, the contact surface of the first root ring 2031a and the spacer ring 2032 is not a plane. For example, in the embodiment of the present invention, the contact surface of the first root ring 2031a and the spacer ring 2032 is the contact surface when the two are completely in contact with each other.

As shown in fig. 3 to 6, the cross-section of the contact surface of the first root ring 2031a and the spacer ring 2032 in a plane through the axis C0 includes at least one of a V shape, an arc shape, a wave shape, and a sawtooth shape.

As shown in fig. 3 to 6, the length of the contact surface of the first packing ring 2031a and the spacer ring 2032 in a cross section in a plane passing through the axis C0 is greater than the length of the contact surface of the first packing ring 2031a and the spacer ring 2032 in the radial direction of the packing assembly 203.

For example, in the packing set assembly provided by the embodiment of the present invention, when the contact surface is an arc, the arc may have a larger arc to obtain a larger contact area. For example, the central angle of the arc is greater than or equal to 60 degrees and less than or equal to 180 degrees, but is not limited thereto.

For example, as shown in fig. 4 and 9, the plane passing through the axis C0 includes the plane in which the first direction X and the second direction Y are located, and may be the plane in which the paper is located.

As shown in fig. 3 to 6, the first root ring 2031a and the spacer ring 2032 are arranged in the first direction X. As shown in fig. 3 to 6, the pressure ring 2033, the two second ring stocks 2031b, the first ring stock 2031a, and the spacer ring 2032 are arranged in this order in the first direction X.

For example, as shown in fig. 6, the seal groove 320 is provided in the valve housing 101. The provision of the seal groove 320 in the valve housing 101 facilitates protection of the valve housing 101, as compared to the case where the seal groove 320 is provided in the spacer ring 2032 shown in fig. 3 and 4.

On the other hand, the utility model aims at the problem of buckling of the valve box 101 and the packing gland 104, and improves the hydraulic end of the plunger pump.

Along with the operation operating mode is more and more abominable, in order to prolong the life of the valve case in the hydraulic end, generally change the material of valve case by carbon steel for stainless steel in the trade, stainless steel material alloy content is higher, and comprehensive properties is good, can satisfy the operation operating mode abominable on-the-spot, and to a great extent improve equipment's life.

Along with the change of the global energy supply structure, unconventional energy such as shale gas and compact oil gradually plays more and more important roles, so that higher requirements are put forward for the fracturing construction mode. With the extensive exploitation of unconventional energy sources, fracturing operations are at higher pressures and longer operating times, which can accelerate the damage of plunger pumps, especially valve boxes as core parts of the hydraulic end, and fatigue failure and wear occur under high pressure. In the field use process of the oil field, maintenance or replacement of the hydraulic end wastes a large amount of manpower and material resources and affects the operation efficiency.

However, when the packing pressing cap 104 is disassembled and assembled, the alloy content of the valve box 101 made of stainless steel is high, the material is relatively soft, and the threads on the packing pressing cap 104 are easily adhered to the threads on the valve box 101 made of stainless steel, so that the seizing occurs. Furthermore, the hydraulic end of the plunger pump contains a large amount of frac sand and the packing assembly 103 also generates a large amount of debris or impurities during use, which, once in the thread between the packing gland and the stainless steel valve housing 101, would greatly increase the risk of galling. The hydraulic end of the valve housing 101 made of stainless steel is likely to be buckled. For example, in the hydraulic end shown in fig. 1, after the valve housing 101 made of stainless steel is snapped, the valve housing 101 cannot be used continuously after the thread is damaged, and the damaged valve housing cannot be repaired even if the damaged valve housing is serious. Usually, the packing pressure cap 104 can not be dismantled after the problem of seizing appears, can only change whole hydraulic end is whole, not only influences the operating efficiency on-the-spot, extravagant manpower and materials moreover.

For example, the reason why the valve housing 101 made of stainless steel is snapped is as follows: the packing gland 104 generates heat due to friction during rotation, the thermal conductivity of stainless steel is relatively low (10-30w/m DEG C, about 1/3 of carbon steel), when the generated pressure and heat destroy the chromium oxide layer, the thread teeth are directly blocked/sheared, and the phenomenon of adhesion occurs due to the soft property of the stainless steel.

Fig. 7 is a partial schematic view of a hydraulic terminal according to an embodiment of the utility model. Fig. 8 is a perspective view of a converter according to an embodiment of the utility model. Fig. 9 is a partial schematic view of a hydraulic terminal according to an embodiment of the utility model.

As shown in fig. 8, an embodiment of the present invention provides a conversion element 106, wherein the conversion element 106 has a cylindrical shape, an inner surface of the conversion element 106 includes internal threads 1062, and an outer surface of the conversion element 106 includes external threads 1061.

As shown in fig. 7 to 9, an embodiment of the present invention provides a conversion element, wherein the conversion element 106 is cylindrical, and the conversion element 106 includes a main body 106 a. For example, as shown in fig. 7 and 8, the transition piece 106 is cylindrical and includes a passage 160 extending from a first end E1 of the transition piece to a second end E2 of the transition piece, the inner surface of the body portion 106a includes internal threads, and the outer surface of the body portion 106a includes external threads.

As shown in FIG. 8, the inner surface of the body portion 106a of the transition piece 106 includes internal threads 1062 and the outer surface of the body portion 106a of the transition piece 106 includes external threads 1061 to facilitate the connection of the transition piece 106 to other components.

As shown in fig. 7 to 9, the converting element 106 further includes an extension 106b at one end of the main body 106a, and the extension 106b protrudes inward, i.e., the extension 106b protrudes from the main body 106a toward the axis a0 of the converting element 106. As shown in fig. 7 to 9, the body portion 106a has a cylindrical shape with both ends open.

For example, as shown in fig. 7 to 9, the cross section of the conversion member 106 in a plane passing through the axis of the conversion member 106 is L-shaped. For example, the main body portion 106a and the extension portion 106b are integrally formed as a single piece. As shown in fig. 9, the extension 106b in the conversion member 106 may serve the purpose of compressing the pressing ring 1033. Of course, in other embodiments, the converting element 106 may not be provided with the extension 106 b.

For example, as shown in fig. 7 to 9, in order to better function as a shifting and pressing ring, the extension portion 106b has a size in the radial direction of the shifting member larger than that of the main body portion 106a and smaller than twice the size of the main body portion 106a in the radial direction of the shifting member. For example, the radial direction of the transition piece is the direction of its diameter.

As shown in fig. 8, one end of the conversion member 106 is provided with a recess 1060. The provision of the recess 1060 facilitates the removal of the conversion member 106 by a removal tool when the conversion member 106 is removed. For example, the removal tool is provided with a protrusion corresponding to the recess 1060.

As shown in fig. 8, one end of the converting element 106 is provided with a plurality of recesses 1060. For example, a plurality of recesses 1060 may be evenly distributed at one end of the main body portion 106a to facilitate the detachment of the conversion member 106.

It should be noted that the shape and size of the recess 1060 are not limited to those shown in fig. 8, and the shape and size of the recess 1060 may be adjusted as needed.

For example, in the case where the conversion member 106 includes the extension portion 106b, the recess 1060 and the extension portion 106b are provided at opposite ends of the main body portion 106 a. That is, the extension portion 106b is provided at one end of the main body portion 106a, and the recess 1060 is provided at the other end of the main body portion 106 a. For example, the end of the main body portion 106a where the extension portion 106b is disposed is a first end, the end of the main body portion 106a where the recess 1060 is disposed is a second end, and the first end and the second end are opposite ends of the conversion member.

For example, the axis a0 of the transition piece and the axis C0 of the packing assembly may coincide after the transition piece and packing assembly are installed, but are not limited thereto.

As shown in fig. 7 to 9, the hydraulic end includes a valve housing 101, a plunger 102, a packing set assembly 103, and a packing gland 104. The function of the packing gland 104 is as described above and will not be described in detail here. As shown in fig. 7 and 9, a conversion member 106 is provided between the valve housing 101 and the packing cap 104. For example, the transition piece 106 is disposed between an inner wall of a packing cavity of the valve housing 101 and the packing cap 104 to connect the valve housing 101 and the packing cap 104. For example, as shown in fig. 7 and 9, the transition piece 106 is provided at a connection position of the valve housing 101 and the packing cap 104. By arranging the conversion part 106, the situation that the valve box 101 and the packing pressing cap 104 in the hydraulic end cannot be used due to thread bonding and snapping in the process of later use as shown in fig. 1 is avoided.

The hydraulic end provided by the utility model has the advantages that the reason and the form of damage of the valve box are considered, the valve box is not easy to damage by additionally arranging the conversion part 106, the hydraulic end can be used for a long time without maintenance, and the operation and production efficiency is improved.

For example, by adding the conversion piece 106 at the packing cavity 108 (as shown in fig. 7), the thread of the packing gland 106 can be isolated from the connecting thread of the valve box 101, so that the risk of snapping during later operation use is prevented, and the operation efficiency is improved.

In the hydraulic end provided by the utility model, after the conversion piece 106 is added, if threads are damaged in later operation, the conversion piece 106 can be machined and removed and then replaced by a new conversion piece, so that the damage of a valve box is avoided, and the operation cost is saved.

Fig. 7 shows a plunger cavity 109 for receiving the plunger 102 (shown in fig. 9), the plunger 102 being located in the plunger cavity 109.

For example, the valve housing 101 shown in fig. 7 and 9 is made of stainless steel. The embodiment of the present invention will be described by taking stainless steel as an example of the material of the valve housing 101.

For example, in some embodiments, the material of the transition piece 106 is the same as the material of the valve housing 101. By arranging the conversion piece 106, threads between the valve box 101 and the packing pressing cap 104 are separated, and the phenomenon of snapping is avoided.

For example, the material of the converter 106 is different from that of the valve box 101, and the threads between the valve box 101 and the packing gland 104 made of stainless steel can be separated by converting the material of the threaded connection position, so that the snap-in phenomenon can be avoided.

In the embodiment of the present invention, the material of the converting member 106 and the material of the valve housing 101 are selected from known materials.

For example, as shown in fig. 7-9, the transition piece 106 is a circular ring-shaped structure. For example, as shown in fig. 7-9, the transition piece 106 includes external threads 1061 for threadably connecting with the valve housing 101, and the transition piece 106 includes internal threads 1062 for threadably connecting with the packing cap 104. In the hydraulic end provided by the utility model, two elements of the threaded connection are in contact with each other.

For example, as shown in fig. 7 to 9, the outer circle of the switching member 106 is threaded for being threadedly connected to the valve housing 101, and the inner circle of the switching member 106 is also threaded for being threadedly connected to the packing gland 104.

For example, as shown in fig. 7 and 9, in order to facilitate the firm connection of the switching member 106 with the valve housing 101, the outer end surface of the switching member 106 may be welded to the valve housing 101 by welding. Fig. 7 shows welding groove 107.

For example, as shown in fig. 9, to facilitate the welding operation, an end of the transition piece 106 distal from the packing assembly 104 is flush with the end surface 1010 of the valve housing 101.

For example, the conversion member 106 has a hardness greater than that of the valve housing 101. For example, the material of the converting element 106 includes a metal or an alloy material.

For example, the thermal conductivity of the transition piece 106 is larger than that of the valve housing 101. That is, the switching member 106 has a better heat conduction performance than the valve housing 101.

For example, the material of the converting element 106 includes, but is not limited to, tungsten carbide or 440C stainless steel.

For example, as shown in fig. 7 and 9, during installation, the packing set assembly 103 is first placed into the packing cavity 108 of the valve box 101, the adapter 106 is screwed onto the stainless steel valve box 101, the packing press cap 104 is screwed onto the adapter 106, the packing set assembly 103 is pressed, and finally the plunger 102 is installed, so that the plunger 102 can seal the high-pressure liquid inside during reciprocating motion.

For example, during installation, after the conversion member 106 is screwed to the valve housing 101 made of stainless steel, the outer end surface of the conversion member 106 and the valve housing 101 may be welded together by welding.

Fig. 10 is a perspective view of a conversion member according to another embodiment of the present invention. The converting member 106 shown in fig. 10 is not provided with the extension 106b, compared to the converting member 106 shown in fig. 8, and the rest can refer to the converting member 106 shown in fig. 8.

At least one embodiment of the utility model also provides a plunger pump, which comprises any one of the hydraulic ends. The plunger pump is used for pressurizing the liquid at the first pressure into the liquid at the second pressure, and the second pressure is larger than the first pressure. For example, the liquid includes a fracturing fluid, but is not limited thereto.

For example, the packing set assembly, the hydraulic end and the plunger pump provided by the embodiment of the utility model can be used as an oilfield fracturing device for oil exploitation.

It should be noted that the packing set assembly 103 in the hydraulic end or plunger pump shown in fig. 9 may also be the packing set assembly 203 provided by the embodiment of the present invention. That is, the packing set assembly 103 in the fluid end or plunger pump shown in fig. 9 is replaced with the packing set assembly 203 provided in the embodiment of the present invention, so that the fluid end or plunger pump has the effect of wear resistance, and the packing set assembly 203 can refer to the above description, and will not be described again.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A packing assembly, comprising:

a spacer ring;

the compression ring and the spacer ring are arranged along the extension direction of the axis of the packing assembly; and

the sealing assembly is positioned between the spacer ring and the compression ring;

wherein the seal assembly includes a first packing ring in at least partial contact with the spacer ring, one of a surface of the first packing ring proximate the spacer ring and a surface of the spacer ring proximate the first packing ring including a protrusion, the other of the surface of the first packing ring proximate the spacer ring and the surface of the spacer ring proximate the first packing ring including a recess, the protrusion at least partially residing within the recess.

2. The packing set assembly of claim 1, wherein the protrusion and the recess are at least partially in contact.

3. The packing assembly of claim 1, wherein a cross-section of a contact surface of the first packing ring with the spacer ring in a plane passing through the axis includes at least one of a V-shape, an arc shape, a wave shape, and a saw-tooth shape.

4. The packing assembly of claim 1, wherein one of a surface of the first packing ring adjacent the spacer ring and a surface of the spacer ring adjacent the first packing ring includes a plurality of recesses, and the other of the surface of the first packing ring adjacent the spacer ring and the surface of the spacer ring adjacent the first packing ring includes a plurality of protrusions, the plurality of recesses and the plurality of protrusions mating.

5. The packing assembly of claim 1, wherein an opposite surface of the spacer ring from a surface in contact with the first packing ring has a seal groove with a seal ring disposed therein.

6. The packing assembly of claim 1, wherein the seal assembly further includes two second packing rings, and the compression ring, the two second packing rings, the first packing ring, and the spacer ring are aligned along an extension of the axis of the packing assembly.

7. The packing assembly of claim 6, wherein a cross-section of the contact surface of the first packing ring and its adjacent second packing ring, the contact surfaces of the two second packing rings, and the contact surface of the compression ring and its adjacent second packing ring in a plane passing through the axis includes at least one of a V-shape, an arc-shape, a wave-shape, and a saw-tooth shape.

8. A fluid end comprising the packing set assembly of any one of claims 1-7.

9. The fluid tip of claim 8, further comprising:

a valve housing including a packing cavity configured to receive the packing pack assembly;

a packing gland configured to compress the packing pack assembly, an

A transition piece disposed between the valve housing and the packing gland, configured to connect the valve housing and the packing gland,

wherein, the material of conversion spare is different with the material of valve box.

10. The fluid end of claim 9 wherein the transition piece has a stiffness greater than a stiffness of the valve housing.

11. The fluid end of claim 9 wherein the outer end face of the transition piece is fixedly attached to the valve housing by welding.

12. The fluid end of claim 11 wherein an outer end face of the transition piece is flush with an end face of the valve housing.

13. The fluid end of any one of claims 9-12 wherein the transition piece includes internal and external threads, the transition piece being threadably coupled to the valve housing, the transition piece being threadably coupled to the packing gland.

14. The fluid end of any one of claims 9-12 wherein the transition member includes a main body portion and an extension portion at a first end of the main body portion, the extension portion projecting from the main body portion toward an axis of the transition member.

15. The fluid end of claim 14 wherein the transition member further comprises a plurality of recesses at a second end of the body portion, the first and second ends being opposite ends of the transition member, the plurality of recesses being evenly distributed.

16. A plunger pump, characterized in that it comprises a fluid end according to any one of claims 8-15.