阅读说明：本技术 一种高压多级泵用机封结构及方法 (Mechanical seal structure and method for high-pressure multi-stage pump ) 是由 丛小青 李奎 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种高压多级泵用机封结构,涉及钻井平台高压冲桩泵用机封技术领域,包括：安装座、补偿弹件、推环、动环组件、动环环片、静环组件、静环环片。动环环片上具有强制循环动力槽。将动环组件与静环组件进行换位,使得动环组件与推环、补偿弹件相连,使得动环环片直接受到补偿弹件的应力,减少动环环片与静环环片之间可能产生的缝隙,加强密封效果,并且在转轴高速、高压转动时,通过动环环片的强制循环动力槽接收流体,进而使得流体润滑动环环片与静环环片之间的接触面,减少干磨,此外,动环环片的旋转离心力还能将残留在强制循环动力槽中的杂质甩出,进一步降低了动环环片、静环环片的磨损率,大大加强使用寿命。(The invention discloses a mechanical seal structure for a high-pressure multi-stage pump, which relates to the technical field of mechanical seals for high-pressure pile-washing pumps of drilling platforms, and comprises the following components: the mounting base, compensation bullet spare, throw-out collar, rotating ring subassembly, rotating ring piece, quiet ring subassembly, quiet ring piece. The movable ring piece is provided with a forced circulation power groove. Transposing rotating ring subassembly and quiet ring subassembly, make the rotating ring subassembly with push away the ring, the compensation bullet links to each other, make the rotating ring piece directly receive the stress of compensation bullet piece, reduce the gap that probably produces between rotating ring piece and the quiet ring piece, strengthen sealed effect, and when the pivot is high-speed, high pressure is rotated, force circulation power groove through the rotating ring piece receives fluid, and then make the contact surface between fluid lubrication rotating ring piece and the quiet ring piece, reduce and dry-grind, in addition, the rotatory centrifugal force of rotating ring piece can also throw away the impurity that remains in force circulation power groove, the rotating ring piece has further been reduced, the wear rate of quiet ring piece, strengthen life greatly.)

1. A mechanical seal structure for a high-pressure multi-stage pump comprises:

a mounting seat;

the left end of the compensation elastic piece is connected with the mounting seat;

the left end of the push ring is connected with the right end of the compensation elastic piece;

the left end of the movable ring component is connected with the right end of the push ring;

the rotating ring piece is arranged at the right end of the rotating ring component, and the rotating ring piece is provided with:

the forced circulation power groove is formed by inwards recessing the local end face of the right end of the movable ring sheet;

the static ring assembly is positioned at the right end of the dynamic ring assembly;

the static ring piece is arranged at the left end of the static ring component and is in fit contact with the movable ring piece;

the mounting seat, the compensation elastic piece, the push ring, the movable ring assembly, the movable ring piece, the static ring assembly and the static ring piece are sleeved on the rotating shaft.

2. The mechanical seal structure for the high-pressure multistage pump according to claim 1, wherein the forced circulation power groove is located at the edge position of the right end face of the movable ring piece, and the forced circulation power groove is of an open groove type.

3. The mechanical seal structure for the high-pressure multi-stage pump according to claim 1, wherein the forced circulation power groove is crescent-shaped, and two ends of the forced circulation power groove are communicated with the outside.

4. The mechanical seal structure for the high-pressure multistage pump according to claim 1, wherein the rotating ring assembly and the stationary ring assembly respectively have a first stress relief groove and a second stress relief groove, a left end angle of the rotating ring piece is located in the first stress relief groove, and a right end angle of the stationary ring piece is located in the second stress relief groove.

5. The mechanical seal structure for the high-pressure multistage pump according to claim 1, wherein the stationary ring segment and the moving ring segment are in surface contact, the stationary ring segment is made of hard alloy, and the moving ring segment is made of silicon carbide.

6. The mechanical seal structure for a high-pressure multistage pump according to claim 1, wherein a gap exists between each of the stationary ring segment and the movable ring segment and the rotating shaft.

7. The mechanical seal structure for a high-pressure multistage pump according to claim 1, wherein the compensation spring member is in a pre-compressed state and has a pressure against the push ring.

8. The mechanical seal structure for a high-pressure multi-stage pump according to claim 1, wherein the mechanical seal structure for a high-pressure multi-stage pump further comprises:

the mounting seat is fixed on the rotating shaft through the set screw.

9. The mechanical seal structure for a high-pressure multi-stage pump according to claim 1, wherein the mount has a stepped hole, the mechanical seal structure for a high-pressure multi-stage pump further comprising:

and the pin penetrates through the stepped hole to be connected with the push ring.

10. The mechanical seal structure for a high-pressure multi-stage pump according to claim 1, wherein the rotating ring assembly further has a mounting groove, the mechanical seal structure for a high-pressure multi-stage pump further comprising:

a baffle ring;

and the baffle ring and the sealing ring are arranged in the mounting groove and used for sealing between the movable ring assembly and the rotating shaft.

Technical Field

The invention relates to the technical field of mechanical seal for a high-pressure pile-punching pump of a drilling platform, in particular to a mechanical seal structure for a high-pressure multi-stage pump.

Background

With the deepening of the development and utilization of oil and gas resources by human beings, the oil and gas exploration and development are shifted from land to sea. Therefore, drilling engineering operations must also be performed in vast oceans.

Before the drilling engineering operation is carried out, a drilling platform (offshore platform) needs to be fixed on the sea, so that a fixing pile needs to be driven into the sea bottom to fix the drilling platform, and further, workers on the drilling platform can normally carry out the drilling engineering operation. After the drilling engineering operation is completed, the drilling platform needs to be moved to other places for exploration or to complete other drilling engineering operations, so that the drilling platform needs to be driven by a high-pressure pile driving pump at the moment, seawater is driven to the periphery of the fixed pile through the pump, silt or stones are washed away, the fixed pile is pulled out, and the drilling platform can move.

However, when the high-pressure pile driving pump of the drilling platform works, the head of the high-pressure pile driving pump is 600 meters (6MPA), namely the high-pressure pile driving pump needs to bear 60 kilograms of water pressure, and the linear speed and the pressure of the high-pressure pile driving pump exceed the limit of the mechanical seal. Therefore, dry grinding can be generated between the movable ring piece and the static ring piece which are sleeved on the rotating shaft in the high-pressure pile washing pump, and the service life of the high-pressure pile washing pump is greatly reduced.

Disclosure of Invention

One of the purposes of the invention is to solve the problem that the service life of a drilling platform high-pressure pile flushing pump is shortened due to dry grinding of a contact surface between a moving ring piece and a static ring piece caused by high speed and high pressure in the prior art.

The invention also aims to provide a mechanical sealing method for the high-pressure multi-stage pump.

In order to achieve one of the purposes, the invention adopts the following technical scheme: a mechanical seal structure for a high-pressure multi-stage pump comprises: a mounting seat; the left end of the compensation elastic piece is connected with the mounting seat; the left end of the push ring is connected with the right end of the compensation elastic piece; the left end of the movable ring component is connected with the right end of the push ring: the rotating ring piece is arranged at the right end of the rotating ring component, and the rotating ring piece is provided with: the forced circulation power groove is formed by inwards recessing the local end face of the right end of the movable ring sheet; the static ring assembly is positioned at the right end of the dynamic ring assembly; the static ring piece is arranged at the left end of the static ring component and is in fit contact with the movable ring piece; the mounting seat, the compensation elastic piece, the push ring, the movable ring assembly, the movable ring piece, the static ring assembly and the static ring piece are sleeved on the rotating shaft.

When the rotating shaft rotates at high speed and high pressure, the forced circulation power groove of the movable ring piece in the movable ring assembly receives fluid (seawater), so that the fluid enters the contact surface between the movable ring piece and the static ring piece for lubrication, and the dry grinding phenomenon at high speed and high pressure is reduced.

The push ring is wrapped around the movable ring component. The movable ring piece is embedded into the right end of the movable ring assembly in an embedded connection mode. The static ring piece is embedded into the left end of the static ring component in an embedded connection mode.

Inlay rotating ring subassembly, quiet ring subassembly to with rotating ring piece, quiet ring piece, avoid rotating ring piece, quiet ring piece to warp too big under the high pressure, lead to rotating ring piece, quiet ring piece unstability (aggravation friction force) to and probably touch the pivot, lead to wearing and tearing aggravation, influence life's problem.

The movable ring piece is a wide ring, and the static ring piece is a narrow ring.

Because the operating mode is the sea water, contains foul and granule, and the rotating ring piece compares quiet ring piece and wants the width, consequently rotating ring piece right-hand member face can contact foul and granule sooner, throws away under the rotatory effort and touches foul and granule, avoids touching between foul and the terminal surface that the granule got into rotating ring piece and quiet ring piece, causes wearing and tearing, influences life.

And the rotating ring piece is used as a wide ring, so that the forced circulation power groove is easy to open, the flowing effect of the forced circulation power groove can be enhanced, in addition, the static ring piece used as a narrow ring can also be in most effective sealing contact with the rotating ring piece, the sealing effect is further enhanced, and the service life effect is maximized.

Further, in the embodiment of the present invention, the forced circulation power groove is located at the edge of the right end face of the moving ring piece, and the forced circulation power groove is an open groove type. The open groove type is formed to remove a local structure on the edge of the right end face of the movable ring sheet, and then an inner concave face structure directly communicated with the outside is formed.

Or the forced circulation power groove is limited to be crescent, and two ends of the forced circulation power groove penetrate through the movable ring piece. Only two ends of the forced circulation power groove penetrate through the movable ring piece. Compare in open forced circulation power groove, the particle impurity of marine can be avoided to the probability greatly in the forced circulation power groove of crescent, leads to the particle impurity in the sea to enter into and cause wearing and tearing between rotating ring piece and the quiet ring piece, reduces life.

Further, in the embodiment of the present invention, the movable ring assembly and the stationary ring assembly respectively have a first stress relief groove and a second stress relief groove, a left end angle of the movable ring segment is located in the first stress relief groove, and a right end angle of the stationary ring segment is located in the second stress relief groove.

Through set up first destressing groove and second destressing groove in rotating ring subassembly and quiet ring subassembly for rotating ring piece, quiet ring piece enough deformation extension space occasionally warp, reduce rotating ring piece, quiet ring piece friction dynamics, and then make forced circulation power groove fluid can be better get into between rotating ring piece, the quiet ring piece, reduce the dry grinding phenomenon, strengthen life.

Further, in the embodiment of the present invention, the stationary ring plate and the moving ring plate are in surface contact, the stationary ring plate is made of hard alloy, and the moving ring plate is made of silicon carbide.

Silicon carbide grinding requires a surface roughness of 0.05um, cemented carbide requires a surface roughness of 0.01um, and WN150 and WN120 standards are enforced. The surface roughness of the annulus affects the load bearing capacity of the seal.

Further, in the embodiment of the present invention, gaps exist between the stationary ring segment and the rotating shaft, respectively. Prevent large-particle fluid medium from rushing into the contact surface between the movable ring piece and the static ring piece to rub.

Further, in the embodiment of the present invention, the compensation elastic member is in a pre-compression state and has a certain pressure against the push ring. When the movable ring piece and the static ring piece have certain friction loss, the movable ring piece can be pushed by the compensation elastic piece to be compensated, and the service life of the movable ring piece and the service life of the static ring piece are prolonged.

Further, in an embodiment of the present invention, the mechanical seal structure for a high-pressure multistage pump further includes: the mounting seat is fixed on the rotating shaft through the set screw.

Further, in an embodiment of the present invention, the mounting seat has a stepped hole, and the mechanical seal structure for a high-pressure multistage pump further includes: and the pin penetrates through the stepped hole to be connected with the push ring.

Further, in the embodiment of the present invention, the rotating ring assembly further has a mounting groove, and the mechanical seal structure for a high-pressure multistage pump further includes: a baffle ring; and the baffle ring and the sealing ring are arranged in the mounting groove and used for sealing between the movable ring assembly and the rotating shaft.

The invention has the beneficial effects that:

the invention replaces the moving ring component and the static ring component, so that the moving ring component is connected (directly or indirectly) with the push ring and the compensation elastic piece, the moving ring piece is directly stressed by the compensation elastic piece, a gap possibly generated between the moving ring piece and the static ring piece in the static ring component is reduced during rotation, the sealing effect is enhanced, and when the rotating shaft rotates at high speed and high pressure, fluid is received through the forced circulation power groove of the moving ring piece, so that the fluid lubricates the contact surface between the moving ring piece and the static ring piece, dry grinding is reduced, in addition, impurities remained in the forced circulation power groove can be thrown out by the rotating centrifugal force of the moving ring piece, the wear rate of the moving ring piece and the static ring piece is further reduced, and the service life is greatly prolonged.

In order to achieve the second purpose, the invention adopts the following technical scheme: a mechanical sealing method for a high-pressure multi-stage pump comprises the following steps:

the movable ring assembly is connected with the push ring and the compensation elastic piece, so that a movable ring piece of the movable ring assembly can be under the stress action of the compensation elastic piece, and a gap possibly generated between the movable ring piece and a static ring piece in the static ring assembly during rotation is reduced;

lubrication, wherein when the rotating shaft rotates at high speed and high pressure, fluid is received through a forced circulation power groove of a moving ring piece in the moving ring assembly, so that the fluid lubricates the contact surface between the moving ring piece and a static ring piece;

and (4) throwing off, namely throwing off the impurities remained in the sea in the forced circulation power tank through the centrifugal force of the movable ring piece in the movable ring assembly when the rotating shaft rotates at high speed and high pressure.

Further, in the embodiment of the invention, the movable ring sheets are wide rings to realize the maximum centrifugal force action.

Further, in the embodiment of the invention, the movable ring sheet is embedded into the movable ring assembly, and the deformation generated by high pressure is reduced by taking the movable ring sheet as a rotating action body.

Further, in the embodiment of the present invention, the first stress relief groove and the second stress relief groove are disposed in the moving ring assembly and the stationary ring assembly, so that the moving ring piece and the stationary ring piece have sufficient deformation extension space when being deformed.

Drawings

Fig. 1 is a schematic structural diagram of a mechanical seal structure for a high-pressure multi-stage pump according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a stationary ring assembly according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a stationary ring segment according to an embodiment of the present invention.

Fig. 4 is a schematic front view of a stationary ring plate according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a mechanical seal structure for a high-pressure multi-stage pump according to another embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a stationary ring assembly according to another embodiment of the present invention.

Fig. 7 is a schematic structural view of a stationary ring segment according to another embodiment of the present invention.

Fig. 8 is a schematic front view of a stationary ring plate according to another embodiment of the present invention.

In the attached drawings

10. Mounting seat 11, shoulder hole

20. Compensating spring 30, push ring

40. Moving ring assembly 41, moving ring sheet 411 and forced circulation power tank

42. First destressing groove 43, mounting groove

50. Static ring component 51, static ring piece 52 and second stress relief groove

60. Set screw 70, baffle ring 80 and sealing ring

90. Pin bolt

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, well-known high pressure multi-stage pump mechanical seal methods and structures have not been described in detail to avoid unnecessarily obscuring the embodiments. In addition, all embodiments may be used in combination with each other.