CN217927140U - Shaft end sealing device for high-pressure pump - Google Patents

Abstract

The utility model discloses a shaft end sealing device for high-pressure pump, include: a stationary ring axially movably disposed; the movable ring is matched with the static ring; the elastic piece is used for pushing the static ring to realize abutting between the dynamic ring and the static ring; a push ring disposed between the elastic member and the stationary ring; the push ring is provided with a push ring body and a cylindrical first matching part which is arranged along the inner diameter side of the push ring body and extends away from the direction of the stationary ring; the stationary ring seat is provided with a notch matched with the first matching part, and the first matching part is positioned in the notch. The push ring is provided with a first matching part which can bear part of stress acted on the push ring by a high-pressure medium, so that the high-pressure stress is dispersed; the radial size of the first matching part is certainly smaller than that of the push ring body, the first matching part can effectively resist high-pressure stress deformation, and the deformation resistance is improved, so that the purpose of stable operation of the shaft end sealing device under high pressure is achieved.

Description

Shaft end sealing device for high-pressure pump

Technical Field

The utility model belongs to the technical field of the axle head is sealed, concretely relates to axle head sealing device for high-pressure pump.

Background

Shaft end seals have found widespread use in a variety of fluid machines and equipment. Although it is not in the field of technology of decisive significance, the quality of the sealing performance may determine whether the device can be operated.

The high-pressure water pump is a fluid machine for pressurizing and conveying oil production well water, and with the development of process technologies in the fields of petrochemical industry, fine chemical industry and the like, higher requirements are provided for the conveying pressure of the high-pressure water pump. At present, a mechanical shaft end sealing structure for a high-pressure water pump is shown in fig. 1 and comprises a movable ring 02 fixed on a shaft and rotating along with the shaft, and a stationary ring 03 in sealing contact with the end face of the movable ring, wherein the stationary ring 03 and a push ring 04 can be axially installed on a stationary ring seat 01.

The engineering application feedback is that when the pressure of the sealing medium is low, the mechanical seal can easily meet the use requirements in the aspects of structural design, processing and manufacturing, material selection and the like; however, when the medium pressure exceeds 15MPa, the sealing cannot be stably operated for a long time due to the unfavorable factors of force deformation, thermal deformation, poor sealing resistance to high pressure and the like of the common mechanical sealing structure, the service life is short, and the sealing stability is poor.

For solving the sealed problem of water pump axle head under the high pressure operating mode more than 15MPa, this patent provides a seal structure, and this structure can effectively solve the structural deformation under the high pressure operating mode, sealed not high pressure resistant scheduling problem, satisfies industry upgrading needs.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.

Disclosure of Invention

The utility model discloses to foretell problem among the prior art, provide a shaft end sealing device for high-pressure pump, through setting up the structure that pushes away the ring, improve anti deformability to reach shaft end sealing device's steady operation's under the high pressure purpose.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

an axle end sealing device for a high pressure pump, comprising:

a stationary ring axially movably disposed;

the movable ring is matched with the static ring;

the elastic piece is used for pushing the static ring to realize abutting between the dynamic ring and the static ring;

a push ring disposed between the elastic member and the stationary ring;

the push ring is provided with a push ring body and a cylindrical first matching part which extends along the inner diameter side of the push ring body and is far away from the direction of the static ring;

the stationary ring seat is provided with a notch matched with the first matching part, and the first matching part is positioned in the notch.

In some embodiments of the present application, the first mating portion extends in a circumferential direction.

In some embodiments of the present application, the first mating portion is axially movably located within the slot, and a first seal is disposed between the first mating portion and a slot wall of the slot.

In some embodiments of the present application, the first seal is an energy storage seal.

In some embodiments of the present application, an annular first receiving groove is formed in a groove wall of the notch, and the first sealing element is located in the first receiving groove.

In some embodiments of this application, the push ring still has along the external diameter side direction of push ring body is close to the direction extension setting of rotating ring is protruding, the installation protruding with the push ring body encloses to establish and is used for the installation the mounting groove of quiet ring.

In some embodiments of the present application, the push ring further has a second matching portion extending along an inner diameter side of the mounting protrusion toward a direction close to the rotating ring, and the second matching portion is sleeved outside the stationary ring.

In some embodiments of the present application, the stationary ring has a stationary ring body, and a stationary ring protrusion extending along one end of the stationary ring body in a direction of the push ring body, and an end of the stationary ring protrusion abuts against the push ring body.

In some embodiments of the present application, a ratio of a radial dimension of the stationary ring projection to a radial dimension of the stationary ring body is 1/3 to 1/2.

In some embodiments of the application, still include the baffling cover that sets firmly on quiet ring seat enclose between baffling cover with quiet ring seat and establish and form and wash the chamber a plurality of washing holes have been seted up to baffling cover's circumference, the washing hole is located the outside of rotating ring and quiet ring seal terminal surface.

In some embodiments of this application, still establish the axle sleeve in the rotation axis outside including the cover be equipped with the mount table that sets up along radial outside extension on the axle sleeve the outside of mount table is equipped with the package edge that sets up along radial extension, the rotating ring is located the inboard on package edge.

In some embodiments of this application, the package is followed and is kept away from the internal diameter side of the one end of mount table is opened and is established the snap ring mouth the snap ring has been installed in the snap ring mouth.

In some embodiments of the present application, a chamfer for avoiding the snap ring is provided on the rotating ring.

In some embodiments of the present application, a rotating ring seal is disposed between the mounting table and the rotating ring.

Compared with the prior art, the utility model discloses an advantage is with positive effect: the push ring is provided with a first matching part which can bear part of stress acted on the push ring by a high-pressure medium, so that the high-pressure stress is dispersed; the radial dimension of the first matching part is certainly smaller than that of the push ring body, the first matching part can effectively resist high-pressure stress deformation, and the deformation resistance is improved, so that the purpose of stable operation of the shaft end sealing device under high pressure is achieved.

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a prior art shaft end seal assembly;

fig. 2 is a schematic structural diagram of an embodiment of a shaft end sealing device for a high-pressure pump according to the present invention;

fig. 3 is an enlarged view of a part of the structure of fig. 1.

Wherein, the shaft sleeve 100; a mounting table 110; a wrap edge 120; a snap ring opening; a snap ring 130;

a stationary ring seat 200; a notch 210; the first receiving groove 211; a first seal ring 250; a baffle sleeve 260; a flush lumen 270;

a rotating ring 10; a chamfer bevel 11;

a stationary ring 20; a stationary ring body 21; a stationary ring boss 22;

a push ring 30; a push ring body 31; a first fitting portion 32; a mounting boss 33; the second fitting portion 34;

an elastic member 40.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the positional relationships shown in the drawings, and the direction close to the rotation axis is "inner" and vice versa. The terminology is for the purpose of describing the invention only and is not intended to be limiting of the invention since it is not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

Referring to fig. 2 and fig. 3, the present invention provides an embodiment of a shaft end sealing device for a high pressure pump, which is a shaft end sealing device for a high pressure pump, and is disposed between a shaft sleeve 100 and a stationary ring seat 200, the stationary ring seat 200 is an end cover of the high pressure pump, the shaft sleeve 100 is sleeved outside a rotation axis of the high pressure pump, and the shaft sleeve 100 and the rotation axis rotate synchronously.

High-pressure pump is with axle head sealing device includes: the static ring 20 is arranged on the static ring seat 200 in an axially movable manner; the movable ring 10 and the static ring 20 are arranged in a matching mode, the movable ring 10 is arranged on the shaft sleeve 100, and the movable ring 10 and the static ring 20 are arranged in a sealing mode. The elastic member 40 is used for pushing the stationary ring 20 to realize the abutment between the moving ring 10 and the stationary ring 20, and the sealing between the moving ring 10 and the stationary ring 20 is realized. The push ring 30 is disposed between the elastic member 40 and the stationary ring 20 for transmitting the pushing force of the elastic member 40 to the stationary ring 20. One end of the elastic member 40 is disposed at the push ring 30, and the other end is disposed on the stationary ring seat 200.

The push ring 30 has a push ring body 31, and a cylindrical first engagement portion 32 extending in a direction away from the stationary ring 20 along an inner diameter side of the push ring body 31, and the first engagement portion 32 extends in an axial direction. The push ring 30 is provided with a first matching part 32, and the first matching part 32 can bear part of stress acted on the push ring 30 by a high-pressure medium, so that the high-pressure stress is dispersed; the radial dimension of the first matching part 32 is definitely smaller than that of the push ring body 31, and the first matching part 32 can effectively resist the stress deformation of high pressure, so that the deformation resistance is improved, and the aim of stably operating the shaft end sealing device under high pressure is fulfilled.

In order to form a support for the first matching portion 32, a notch 210 matching with the first matching portion 32 is formed on the stationary ring seat 200, and the first matching portion 32 is axially movably located in the notch 210. When the stationary ring 20 is pushed by the elastic member 40 and moves axially, the push ring 30 moves together, so that the first fitting portion 32 moves in the notch 210; and a part of the force of the high-pressure medium acting on the push ring 30 can be transmitted to the stationary ring seat 200 through the first matching part 32, which is beneficial to ensuring the stability of the operation of the moving ring 10 and the stationary ring 20.

In some embodiments of the present application, the first mating portion 32 is axially movably located within the slot, and a first seal 250 is disposed between the first mating portion 32 and a groove wall of the slot 210. The first seal 250 is an energy storage seal. An annular first receiving groove 211 is formed in a groove wall of the notch 210, and the first sealing element 250 is located in the first receiving groove 211.

In some embodiments of the present application, the push ring 30 further has a mounting protrusion 33 extending along an outer diameter side of the push ring body 31 in a direction approaching the movable ring 20, and the mounting protrusion 33 and the push ring body 31 enclose a mounting groove for mounting the stationary ring 20. The end of the static ring 20 far away from the dynamic ring 1 is positioned in the mounting groove.

In some embodiments of the present application, the push ring 30 further has a second matching portion 34 extending along the inner diameter side of the mounting protrusion 33 to a direction approaching the moving ring 10, and the second matching portion 34 is sleeved on the outer side of the stationary ring 20. By providing the second fitting portion 34, stability after the stationary ring 20 is installed is facilitated.

In some embodiments of the present application, the stationary ring 20 has a stationary ring body 21, a stationary ring protrusion 22 extending along one end of the stationary ring body 21 in the axial direction of the push ring body 31, and an end of the stationary ring protrusion 22 abuts on the push ring body 310. By arranging the static ring bulge 22, the matching between one end of the static ring 20 close to the push ring 30 and the push ring 30 is avoided, and the contact area between the static ring 20 and the push ring 30 is reduced; the contact area between the static ring 20 and the push ring 30 needs to be ground, so that the sealing between the static ring 20 and the push ring 30 is ensured not to leak; and the static ring 20 and the push ring 30 are in flush contact, so that the transmission of the pushing force is smooth. Through setting up quiet ring arch 22, the area of contact that needs to grind is less, under the prerequisite of guaranteeing that the end face contact is not revealed, is favorable to improving the machining precision on its surface to and improve grinding efficiency.

Preferably, the height of the static ring bulge 22 is 0.2-0.5 mm, and the ratio of the radial dimension of the static ring bulge 22 to the radial dimension of the static ring body 21 is 1/3-1/2. Only the end surface of the stationary ring projection 22 near the push ring 30 and the portion corresponding to the push ring 30 need be ground. A stationary ring sealing element is arranged between the stationary ring bulge 22 and the push ring 30, so that the stationary ring bulge 22 and the push ring 30 are sealed.

In some embodiments of the present application, the shaft end sealing device for a high pressure pump further includes a baffling sleeve 260 fixedly disposed on the stationary ring seat 200, a flushing cavity 270 is defined between the baffling sleeve 260 and the stationary ring seat 200, a plurality of flushing holes are disposed in a circumferential direction of the baffling sleeve 260, and the flushing holes are located outside the sealing end surfaces of the moving ring 10 and the stationary ring 20. Flushing cavity 270 dashes and is equipped with mobile flush fluid, and the flush fluid lubricates, cools off the seal face, takes away the filth of seal face department simultaneously, provides a better operational environment for the seal face, guarantees mechanical seal life. The flushing liquid flows to the sealing end faces of the moving ring 10 and the static ring 20 simultaneously in the circumferential direction through a plurality of flushing holes; the flushing effect on the sealing end face is increased.

In some embodiments of the present application, a mounting table 110 is provided on the shaft sleeve 100 and extends radially outward, a wrapping edge 120 is provided on the outer side of the mounting table 110 and extends radially, and the rotating ring 10 is located on the inner side of the wrapping edge 120. The installation table 110 and the wrapping edge 120 are arranged, so that the stability of the movable ring 10 after installation is facilitated; a rotating ring seal is provided between the rotating ring 10 and the mounting block 110.

In some embodiments of the present application, a snap ring opening is formed on an inner diameter side of an end of the rim 120 far from the mounting platform 110, and the snap ring 130 is disposed in the snap ring opening. The movable ring 10 is provided with a chamfer 11 for avoiding the snap ring 130. The snap ring 130 is provided for limiting the movable ring 10, so that the movable ring 10 is prevented from being pulled out from the bag edge 120. Through setting up chamfer inclined plane 11, avoid interfering, be favorable to the installation of snap ring 130 to be fixed.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims (10)

1. A shaft end sealing device for a high-pressure pump is characterized by comprising:

a stationary ring axially movably disposed;

the movable ring is matched with the static ring;

the elastic piece is used for pushing the static ring to realize abutting between the dynamic ring and the static ring;

a push ring disposed between the elastic member and the stationary ring;

the push ring is provided with a push ring body and a cylindrical first matching part which is arranged along the inner diameter side of the push ring body and extends away from the direction of the stationary ring;

the stationary ring seat is provided with a notch matched with the first matching part, and the first matching part is positioned in the notch.

2. The shaft end seal for a high pressure pump of claim 1, wherein the first engagement portion is axially movable within the notch, and a first seal is provided between the first engagement portion and a groove wall of the notch.

3. The shaft end sealing device for the high-pressure pump as claimed in claim 2, wherein an annular first receiving groove is formed in a groove wall of the notch, and the first sealing element is located in the first receiving groove.

4. The shaft end sealing device for the high-pressure pump according to any one of claims 1 to 3, wherein the push ring further has a mounting protrusion extending in a direction of approaching the movable ring from an outer diameter side of the push ring body, and the mounting protrusion and the push ring body enclose a mounting groove for mounting the stationary ring.

5. The shaft end sealing device for the high-pressure pump as recited in claim 4, wherein the push ring further has a second engagement portion extending along an inner diameter side of the mounting protrusion in a direction approaching the movable ring, and the second engagement portion is disposed on an outer side of the stationary ring.

6. The shaft end sealing device for the high-pressure pump according to claim 4, wherein the stationary ring has a stationary ring body, and a stationary ring protrusion extending in a direction of the thrust ring body along an axial direction of one end of the stationary ring body, and an end of the stationary ring protrusion abuts against the thrust ring body.

7. The shaft end seal device for a high-pressure pump according to claim 6, wherein a ratio of a radial dimension of the stationary ring projection to a radial dimension of the stationary ring body is 1/3 to 1/2.

8. The shaft end sealing device for the high-pressure pump according to any one of claims 1 to 3, further comprising a baffling sleeve fixedly arranged on the stationary ring seat, wherein a flushing cavity is defined between the baffling sleeve and the stationary ring seat, a plurality of flushing holes are formed in the circumferential direction of the baffling sleeve, and the flushing holes are located outside the sealing end faces of the movable ring and the stationary ring.

9. A shaft end sealing device for a high-pressure pump according to any one of claims 1 to 3, further comprising a shaft sleeve sleeved outside the rotating shaft, wherein a mounting table extending radially outward is provided on the shaft sleeve, a wrapping edge extending radially is provided on the outer side of the mounting table, and the rotating ring is located on the inner side of the wrapping edge.

10. The shaft end sealing device for the high-pressure pump according to claim 9, wherein a snap ring opening is formed in an inner diameter side of one end of the bag edge, which is far away from the mounting table, and a snap ring is arranged in the snap ring opening; and the movable ring is provided with a chamfer inclined plane for avoiding the snap ring.

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