Disclosure of Invention
An object of the present invention is to provide a guide sleeve having good wear resistance and corrosion resistance.
The guide sleeve for achieving the purpose is arranged on the periphery of the plunger and comprises an outer ring guide sleeve and an inner ring guide sleeve, and the outer ring guide sleeve is made of metal; the inner ring guide sleeve is made of nonmetal materials and is propped against the inner periphery of the outer ring guide sleeve, and the inner ring guide sleeve comprises a plurality of radial through holes; the radial through hole and the outer ring guide sleeve enclose a liquid storage cavity, the inner ring guide sleeve further comprises a notch arranged on the annular outer wall, and the notch enables the annular outer wall to be discontinuously arranged.
In one or more embodiments, the acute angle defined by the extending direction of the notch and the axial direction of the inner ring guide sleeve ranges from 20 ° to 45 °.
In one or more embodiments, the width of the slot ranges from 1.5 to 3mm.
In one or more embodiments, the outer race guide sleeve includes a pair of annular sleeves that are spliced to one another.
In one or more embodiments, radial shoulders axially limiting the inner ring guide sleeve are provided at both ends of the outer ring guide sleeve.
In one or more embodiments, the outer race guide sleeve material is stainless steel.
In one or more embodiments, the inner collar guide sleeve is a graphite impregnated material, preferably graphite impregnated antimony.
Another object of the present invention is to provide a reciprocating pump, which includes a power end and a fluid end, wherein the fluid end includes a pump body, a sealing box, a liquid inlet and outlet valve, a plunger disposed in the sealing box, and the guide sleeve.
Still another object of the present invention is to provide a method for preparing the above-mentioned guide sleeve, comprising the steps of: the notch of the inner ring guide sleeve is extruded, so that the inner ring guide sleeve is extruded to be partially contracted, and the inner ring guide sleeve is sent into the outer ring guide sleeve.
In one or more embodiments, the outer guide sleeve includes a pair of circumferential sleeves, the notch of the inner guide sleeve is compressed, one end of the inner guide sleeve is fitted into one of the pair of circumferential sleeves, and the other end of the inner guide sleeve is fitted into the other of the pair of circumferential sleeves.
In one or more embodiments, the method further comprises the steps of: after the inner ring guide sleeve is sleeved on the outer ring guide sleeve, the extrusion force on the inner ring guide sleeve is canceled, so that the inner ring guide sleeve is reset and is clung to the inner wall of the outer ring guide sleeve.
The guide sleeve is arranged through the inner ring guide sleeve and the outer ring guide sleeve, so that the guide sleeve can integrate two materials, the strength is improved by utilizing the outer ring metal material, the wear resistance is improved by utilizing the inner ring nonmetal material, and the difficulty in assembly is effectively reduced by arranging the notch which enables the annular outer wall of the inner ring guide sleeve to be discontinuously arranged, so that the sleeving process of the two annular structures is simple and labor-saving.
Detailed Description
The present invention will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in terms of the content of this specific embodiment.
It is noted that these and other figures are merely examples, which are not drawn to scale and should not be construed as limiting the scope of the invention as it is actually claimed.
Fig. 1 shows a fluid end structure of a common reciprocating pump, which comprises a main sealing box 101, a suction valve 104, a discharge valve 103 and a plunger 102, wherein the left and right reciprocating motion of the plunger 102 drives a medium to complete conveying through the suction valve 104, a chamber 105 and the discharge valve 103.
As shown in fig. 2, the stuffing box structure 200 generally includes a primary seal box 101, a secondary seal box 208, a stuffing 207, a guide sleeve 204, a seal ring 205, and an adjustment nut. In the embodiment shown in fig. 2, the adjustment nut includes a primary adjustment nut 206 and a secondary adjustment nut 209 disposed at the end of the plunger 102 to effect compression adjustment of the packing 207. To uniformly compress each packing, annular gaskets 202 are provided at both ends of the packing 207.
The secondary seal housing 208 is disposed inside the primary seal housing 101, and the filler 207 is filled inside the secondary seal housing 208, and the material of the filler 207 is generally a woven material such as carbon fiber, glass fiber, or asbestos fiber depending on the nature of the transport medium, the temperature, the pressure, and the linear velocity of the plunger.
The guide sleeve 204 is arranged inside the sealing box body, sleeved on the periphery of the plunger 102, and has the functions of protecting the sealing filler 207 and guiding and supporting the plunger 102. A tight clearance between the guide sleeve 204 and the plunger 102 is necessary for a longer packing life. During reciprocation of the plunger 102, the plunger 102 continues to reciprocate within the guide sleeve 204 forming a pair of friction pairs, thus minimizing damage to the plunger 102. The guide sleeve 204 made of metal is easy to damage the surface of the plunger.
The guide sleeve disclosed by the disclosure has good wear resistance and corrosion resistance.
Referring to fig. 3A to 5, the guide sleeve 204 is disposed on the outer periphery of the plunger 102, and includes an outer ring guide sleeve 41 made of metal and an inner ring guide sleeve 42 made of non-metal, where the inner ring guide sleeve 42 abuts against the inner periphery of the outer ring guide sleeve 41, and includes a plurality of radial through holes 43.
The radial through hole 43 and the inner wall surface 410 of the outer ring guide sleeve 41 enclose a liquid storage cavity 44, and the liquid storage cavity 44 is used for storing liquid. When the plunger 102 reciprocates, the existence of the liquid storage cavity 44 can enable a layer of oil film to be formed between the plunger 102 and the inner ring guide sleeve 42 of the guide sleeve 204 more easily, so that the plunger 102 and the inner ring guide sleeve 42 are protected.
The radial through holes 43 may be arranged in an array as shown in fig. 3B, and those skilled in the art will understand that the radial through holes 43 may also be arranged randomly or in a distribution with different densities according to the oil film requirement.
The outer ring guide sleeve 41 is made of metal, preferably an alloy such as stainless steel, and has high mechanical strength, and the metal can improve the strength and corrosion resistance of the guide sleeve.
The inner ring guide 42 is made of nonmetallic materials.
The inner ring guide sleeve 42 is preferably made of graphite impregnated material, and the graphite impregnated material has excellent self-lubricating property and low friction coefficient, so that the friction force between the inner ring guide sleeve 42 and the plunger 102 can be effectively reduced, the abrasion to the plunger 102 can be avoided when the inner ring guide sleeve 42 and the plunger 102 are rubbed, and the corrosion of the guide sleeve can be effectively avoided.
More preferably, the inner collar 42 is impregnated with graphite. The graphite-impregnated antimony is a composite material with good corrosion resistance and wear resistance, and because the surface of the antimony can form a layer of protective film to prevent the graphite from being corroded and worn, and because the heat conductivity of the antimony is much higher than that of the graphite, the graphite-impregnated metal antimony also has good heat conducting property, and is beneficial to heat dissipation of the filler.
Through the combination of two materials of inner circle uide bushing and outer lane uide bushing, make the uide bushing of this disclosure compromise the good wearability that alloy material brought and the corrosion resistance that graphite impregnating material brought for the uide bushing is whole to have appropriate intensity, good self-lubricating nature and good wearability and corrosivity, can avoid the shortcoming of two materials simultaneously.
The double-layer guide sleeve combined by the materials can safely run at a high temperature of 320 ℃ and a high pressure of 28 Mpa.
Preferably, to ensure the fixation of the outer ring guide 41 and the inner ring guide 42, a pair of radial shoulders 47 are further provided at the end side of the outer ring guide 41, and the pair of radial shoulders 47 axially abut the inner ring guide 42 to prevent the inner ring guide 42 from moving.
In addition, the inner race guide sleeve 42 also includes a notch 45 disposed in the annular outer wall 420, the notch 45 providing for discontinuous placement of the annular outer wall 420.
The notch 45 is provided to simplify and save labor in the assembly process of the two ring structures.
Since a tight clearance between the guide sleeve 204 and the plunger 102 is necessary for a long packing life, the inner and outer guide sleeves having inner and outer annular structures need to maintain close contact. Because the inner ring guide sleeve 42 is made of non-metal materials, the inner ring guide sleeve 42 is easy to damage according to the traditional extrusion assembly mode, and particularly, under the condition that the inner ring guide sleeve 42 is provided with a radial shoulder 47, the difficulty of extending into the outer ring guide sleeve 41 during the installation of the inner ring guide sleeve 42 is increased.
Therefore, by pressing the inner ring guide 42, the wall surfaces of the inner ring guide 42 on both sides of the notch 45 can be pressed to generate a slight contraction by the notch generated by the notch 45, temporarily reducing the diameter or outer diameter of the inner ring guide 42, and making it easier to fit the inner ring guide 42 into the outer ring guide 41. And the inner ring guide sleeve 42 can be expanded to generate stronger pretightening force, and the inner wall surface 410 of the outer ring guide sleeve 41 is tightly clung, so that the inner ring guide sleeve 42 and the outer ring guide sleeve 41 are firmly fixed together.
Especially, on the premise that the inner ring guide sleeve 42 is made of impregnated graphite material and is easy to break, the notch 45 can simply install the annular impregnated graphite on the inner side of the metal outer ring guide sleeve 41 with less force, so that the problems of beating and excessive force in the installation process are avoided, and the break of the graphite material is effectively avoided.
In some embodiments, the direction of extension of the notch 45 defines an acute angle in the range of 20-45 ° with the axial direction S of the inner race guide sleeve 42.
In the embodiment shown in fig. 3B, the extending direction of the notch 45 forms an angle of 30 ° with the axial direction S of the inner ring guide 42, so that the plunger 102 generates a certain pressing force on the inner wall of the inner ring guide 42 in consideration of friction between the plunger 102 and the inner wall surface 421 of the inner ring guide 42, and the notch 45 is inclined to enable the pressing force to be dispersed to the inner wall of the inner ring guide 42, so as to avoid stress concentration. Compared with the notch setting with the axis parallel and level, the design can improve the security, also can avoid the notch if install in the plunger below and need to recognize the problem of accurate assembly direction.
In some embodiments, the width of the slot 45 ranges from 1.5 to 3mm, and in the embodiment shown in FIG. 3B, the width of the slot 45 is 2mm. The purpose of this arrangement is to give the inner race guide sleeve 42 a margin for diameter reduction. It will be appreciated by those skilled in the art that the width of the inner race guide 42 is determined by the diameter of the inner race guide 42 and may be reasonably modified.
To further facilitate the installation of the two annular structures, the outer ring guide sleeve 41 includes a pair of annular sleeves 411 that are spliced to each other, as shown in fig. 4, the pair of annular sleeves 411, 411' are spliced to each other outside the inner ring guide sleeve 42, and the sides of the annular sleeves are attached to each other to have a length substantially corresponding to the length of the inner ring guide sleeve 42. Thus, the pair of annular sleeves 411, 411' make the outer ring guide sleeve 41 open, when the inner ring guide sleeve 42 is installed, the notch 45 of the inner ring guide sleeve 42 is extruded, one end of the inner ring guide sleeve 42 is installed into one of the pair of annular sleeves, the other end of the inner ring guide sleeve 42 is installed into the other one of the pair of annular sleeves, and then the two annular sleeves are spliced and aligned, at this time, the inner ring guide sleeve 42 is expanded on the inner wall surface 410 of the outer ring guide sleeve 41 to generate stronger pretightening force, so that the pair of annular sleeves and the inner ring guide sleeve become a stable whole.
In connection with the above description of the notch, it is also understood that a method of manufacturing a guide sleeve is provided that enables efficient and labor-efficient manufacturing of guide sleeves with annular structures of two diameters.
The method comprises the following steps: the notch of the inner ring guide sleeve is extruded, so that the inner diameter of the inner ring guide sleeve is temporarily reduced, and after the inner ring guide sleeve is fed into the outer ring guide sleeve, the inner ring guide sleeve expands on the inner wall surface of the outer ring guide sleeve under the self volume, so that the inner ring guide sleeve and the outer ring guide sleeve are firmly combined together.
Specifically, when the outer ring guide sleeve is provided with the opening generated by the annular sleeve 411, the notch of the inner ring guide sleeve 42 is extruded, so that the diameter of the inner ring guide sleeve 42 is slightly reduced, then two ends of the inner ring guide sleeve 42 respectively extend into the two annular sleeves 411, and finally the two annular sleeves 411 are buckled.
When the inner ring guide sleeve 42 is fed into the outer ring guide sleeve 41, the extrusion force to the inner ring guide sleeve 42 is canceled, the inner ring guide sleeve 42 can be reset and expanded, and the inner ring guide sleeve 42 is restored to the original state so as to be clung to the inner walls of the two annular sleeves 411 of the outer ring guide sleeve 41, so that the inner ring guide sleeve 42 and the two annular sleeves 411 form a stable whole.
The method can simply and laborsaving prepare the double-layer guide sleeve structure, and avoid damaging the graphite impregnated material on the inner side, so that the inner ring is more easily arranged in the outer ring and is firmly fixed with the outer ring.
By combining the description of the guide sleeve structure, the reciprocating pump can be further understood to comprise a hydraulic end and a power end, wherein the hydraulic end comprises a pump body, a liquid inlet and outlet valve, a sealing box, a plunger arranged in the sealing box, a filler, a main sealing box body, a secondary sealing box body, an adjusting nut and the guide sleeve.
The inner ring guide 42 of the guide is disposed with a gap from the plunger 102. Preferably, the engagement of the inner race guide 42 with the plunger 102 should achieve a minimum clearance within the feasible range of the device.
In some embodiments, the seal housing of the reciprocating pump includes a plurality of guide sleeves axially disposed on either side of the packing, referred to as a front guide sleeve 204 and a rear guide sleeve 204' as shown in FIG. 2.
In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.
In some embodiments, numbers describing the components, number of attributes are used, it being understood that such numbers being used in the description of embodiments are modified in some examples by the modifier "about," approximately, "or" substantially. Unless otherwise indicated, "about," "approximately," or "substantially" indicate that the number allows for a 20% variation. Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations that may be employed in some embodiments to confirm the breadth of the range, in particular embodiments, the setting of such numerical values is as precise as possible.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.