CN102374292A

CN102374292A - Sealing component, an apparatus with the sealing unit and a sealing method

Info

Publication number: CN102374292A
Application number: CN2011102595215A
Authority: CN
Inventors: 简·诺德
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-08
Filing date: 2011-07-08
Publication date: 2012-03-14
Anticipated expiration: 2031-07-08
Also published as: NL2005057C2; CN102374292B; DE102011106920A1

Abstract

The present invention relates to a sealing component, an apparatus with the sealing unit and a sealing method. The sealing component comprises a core placed in a chamber, where an operation of a piston or plunger is in relation with chamber movement; a front sealing apparatus; and a back sealing apparatus, wherein a seal core is moved relative to the chamber, so as to obtain a sealing force.

Description

Black box, the device that has the sealing assembly and encapsulating method

Technical field

The present invention relates to a kind of black box that is used for packed-piston or plunger.More particularly, black box according to the present invention relate to a kind of can be under up to the pressure of 2000 crust the high-pressure sealing ring of reliably working.Such pressure can run into such as the handling oil aqueous mixtures time.

Background technique

Known Sealing is processed by polyurethane usually, and itself is applicable to the use oil condition.But when handling water or oil water mixture, performance descends usually significantly, especially under the relatively high pressure that reaches 2000 crust usually.

Summary of the invention

The purpose of this invention is to provide a kind of black box that is used for packed-piston or plunger, it is compared with known Sealing has improved performance.

Will black box according to the present invention be used for packed-piston or plunger can be realized above-mentioned purpose, the sealing assembly comprises:

-can be placed on the sealing core in the chamber, wherein piston or plunger move with respect to chamber in use;

-preceding seal arrangement; With

-back seal arrangement wherein seals core in use and moves with respect to chamber, thereby obtains sealing force.

For example, can be used for piston or plunger according to black box of the present invention.Usually plunger pump is made up of the cylinder body that is built-in with reciprocating plunger.Suction valve and expulsion valve are installed in the head of this cylinder body usually.In induction stroke, plunger is retreated and suction valve is opened, so that fluid gets into cylinder body.In forward stroke, plunger is released cylinder body through expulsion valve with fluid.

The application's purpose is, for piston, it is opposite that the power on the black box of acting on is compared with the situation of plunger.

Black box according to the present invention has sealing core, preceding seal arrangement and back seal arrangement.The sealing core can be placed in the chamber of device of similar pump.In use, chamber is with respect to piston or plunger motion.According to the present invention, the sealing core moves with respect to chamber in use, thereby obtains required sealing force.In this way, sealing force is suitable for acting on the power on the black box.

For example, in getting into stroke and in state of rest, seal arrangement should be able to keep negative pressure perhaps near vacuum under the situation of low pressure source supplier as water tap.Need black box to seal against plunger at the chamber of a side sealing abutment means and at opposite side.Preceding seal arrangement seals between sealing core and chamber.Back seal arrangement seals between core and plunger.

In discharge or compression stroke, black box will face higher pressure.Likewise, preceding seal arrangement seals between core and chamber, and back seal arrangement seals between core and plunger.Preceding seal arrangement is pushed against sealing core and chamber by the pressure in the cylinder body, so that the power of preceding seal arrangement outwards guides, the assistance of minimum only is provided against the core plunger for the sealing core by this.When promoting black box and compressed fluid against supporting zone along the direction away from the cylinder body volume, core increases along with the increase of cylinder interior pressure against the sealing force of plunger.This provides active force for the sealing of sealing core against plunger.

Through automatically increasing sealing force according to the pressure in the cylinder body, black box can normally move until higher relatively pressure.For example, having illustrated black box according to the present invention is higher than 10 crust at pressure, is higher than 500 crust, is higher than 1000 crust, is higher than 1500 crust and can normally moves when in the oil water mixture of 2000 crust, using.

Preferably, preceding seal arrangement comprises the O shape circle in the recess recess that is arranged on the sealing core.Equally preferably, back seal arrangement comprises the O shape circle in the groove that is arranged on the sealing core.Sealed core portion preferably is arranged in the fluid or in the device of similar pump.In order to regulate sealing force, the active force that the sealing core can act on the black box according to the actual direction along plunger or piston moves with respect to chamber slightly.Preferably, preceding seal arrangement and/or back seal arrangement comprise that shore hardness is 70 butadiene acrylonitrile rubber (NBR).Preferably, the sealing core comprises polymer material, most preferably is the ultra-high molecular weight polyethylene (UHMWPE) of 1000 grades.This special material relatively easily obtains, and can utilize conventional instrument to carry out fine finishing, has wear resistance simultaneously, and can use with water and/or chemical product.

As an attendant advantages according to the present invention, assembly is relatively easily installed.In addition, the risk of when seal arrangement is installed, destroying Sealing is minimum, has increased the efficient according to black box of the present invention by this.

Another attendant advantages according to black box of the present invention is, can use common retrievable material and do not need difficulty and expensive fine finishing.This causes black box cost according to the present invention effectively to reduce.

In according to a preferred embodiment of the present invention, the sealing core is provided with opening with holes, wherein in use plunger is arranged in the opening, and the size of its mesopore is littler than the size of plunger.

Have the sealing core of comparing littler hole with the outside dimension of core plunger through providing, the material of sealing core is stretched and obtains the effect of low pressure seal by this, and the outside dimension of sealing core also slightly increases.Different with known Sealing, the sealing core can only stretch and can not compress.This can obtain required sealing force.

In illustrated example, plunger is provided with the diameter of 8mm.The core hole is provided with the diameter of 7.5mm.In the time of in plunger inserts the core hole, core is stretched to obtain pretensioning, reaches the effect of low pressure seal.In addition, stretch wearing and tearing when having considered that long-time running does not reduce the low pressure seal effect.This has promoted the efficient according to black box of the present invention.The external diameter of sealing core is slightly less than the chamber size of device.For example, the external diameter of sealing core is 15.76mm, and the aperture of chamber is 16mm.According to the size in above-mentioned plunger and core hole, core is stretched, and the external diameter of core will reach 16mm after installation, accurately is complementary with the size of chamber by this.So in this preferred embodiment, the outside dimension of sealing core is less than the size of the chamber of fluid cylinder head.

Preferably, the size in plunger, chamber, core hole is mated with sealing core outside dimension, causes after being installed to plunger in the core, and the sealing core meets the size of chamber.In use, its material of sealing core that preferably stretched.

Preferably, with afterwards, the size of sealing core is following relation before being installed in plunger and black box in the chamber:

Internal diameter before regional external diameter-installation before the final internal diameter=installation of the final external diameter-core in zone of core.

In above-mentioned example, the external diameter before installing is that 15.76mm, internal diameter are 7.5mm.Core internal diameter after the installation is that 8mm, core external diameter are 16mm.In this example, the size of the outside dimension of preceding sealing core less than chamber is installed.The material of this core that can stretch.

In an alternative preferred embodiment according to the present invention, the outside dimension of sealing core is greater than the size of chamber, and the size in hole is greater than the size of piston or plunger.

Through providing sealing core and the size of size greater than chamber also greater than the hole of piston or plunger, above sealing principle is reversed, and causes according to the term that uses among the application, and black box can be used as piston seal.All sizes are interrelated with aforesaid similar fashion.

In according to a preferred embodiment of the present invention, seal arrangement sealing in back is against the supporting zone of main body in use.

Through the supporting zone against main body, sealing force is along with the pressure that cylinder interior ran into increases and increases.Preferably, main body is stuffing box gland (gland) or like.Preferably, back seal arrangement is arranged in the groove of sealing core.Equally preferably, this groove is configured to almost hold the back seal arrangement that is enclosed by the similar O shape of compression fully.When the cylinder body volume was pressurized, the whole front region of black box received active force.Back seal arrangement by compression provides reaction force and supports the black box against main body.Since the back seal arrangement against the supporting zone of main body front region less than black box, the pressure that produces in the groove of sealing core is greater than the place ahead pressure that acts on the black box.This makes sealing force greater than the place ahead pressure that cooperates, and forms the tight seal of the active force that is suitable for black box by this.Bigger active force produces bigger slightly reaction force, and less action force produces less reaction force relatively.This has reduced the wearing and tearing according to black box of the present invention.

The invention still further relates to a kind of device that is provided with above-mentioned black box.

This device provides effect and the advantage identical with black box.For example, this device is reciprocating pump, plunger pump or motor.

The present invention relates to a kind of encapsulating method again, and this method comprises the step that above-mentioned black box is provided.

This method provides effect and the advantage identical with black box.

Description of drawings

Advantage, characteristic and details further of the present invention will combine accompanying drawing to set forth based on its preferred embodiment, wherein:

-Fig. 1 shows the plunger seal according to high-pressure service pump of the present invention;

-Fig. 2 shows the sealing core of Fig. 1;

-Fig. 3 A and B show the black box of Fig. 1;

-Fig. 4 A and B show the black box in induction stroke and the compression stroke respectively; With

-Fig. 5 shows the alternate embodiments according to black box of the present invention.

Embodiment

Black box 2 (Fig. 1) can use in high-pressure service pump 4.Pump 4 comprises fluid cylinder head 6, Sealing supporting disk 8 and stuffing box gland 10.In addition, pump 4 is provided with import 12 and inlet check valve 14, and export 16 with outlet non-return valve 18.Plunger 20 can axially move in the direction A corresponding with induction stroke along it, and in the direction B corresponding with discharge or compression stroke, moves.Black box 2 comprises the core 22 in the chamber 23 that is placed on pump 4, preceding O shape circle 24 and back O shape circle 26.In illustrated embodiment,

O shape circle

22 and 24 is that 70 NBR processes by shore hardness.Sealing core 22 cuts with simple sharp keen cutter on the standard lathe.The basic material of sealing core 22 is the UHMWPE of 1000 grades.

Core 22 (Fig. 2) has the hole 28 that is used for plunger 20, be used for the recess 30 of O shape circle 24 and be used for the groove 32 of O shape circle 26.In illustrated embodiment, the diameter in hole 28 is 7.5mm, and the diameter of groove 32 relative its center lines is 11.5mm, and the degree of depth that groove 32 gets into cores 22 is 1.5mm, and the Extreme breadth of groove 32 is 2mm.Core 22 is 6.5mm along its axial length, is 2.5mm for recess 30.The external diameter of core 22 is 15.76mm, and the external diameter of recess 30 is 12.4mm.

Black box 2 comprises the core 22 and O shape circle 24,26 (Fig. 3 A and B) that is installed together.In illustrated embodiment, plunger diameter is 8mm, and the recess in the fluid cylinder head 6 of the pump 4 that provides for black box 2 or the diameter of chamber are 16mm.For given size, the surface area of core 22 before plunger 20 is installed is 150.8mm ², so that after assembling, the internal diameter of core 22 is stretched to 8mm, and external diameter is stretched to 16mm, to be assemblied in just in the chamber of being located in the fluid cylinder head 6 23.

Black box 2 is assemblied in the chamber 23 and need not compression assembly 2.Therefore, assembly 2 does not need prestressing.When inserting plunger 20, assembly 2 is stretched and seals against the wall of chamber 23.Therefore, (radially) size of chamber 23 and core 22 is basic identical.

In illustrated embodiment, O shape circle 26 extends about 0.5mm after core 22.Can find that in assembly 2 according to the present invention corresponding grooves is compared approximately big by 15% in the volume of O shape circle 26 and the core 22.In use, O shape circle 26 is pushed against the wall 38 (as mentioned below) of chamber 23, and assembly has the stroke of about 0.5mm.The internal surface relatively flat of core 22 or level and smooth is for example to stop the infiltration through groove.Sealing against plunger 20 occurs in the total inner surface that spreads all over core 20 basically.Preferably, the respective surfaces of plunger 20 also is set to relatively flat or level and smooth.

Under relatively low pressure, assembly 2 seals against plunger 20 in the total inner surface that spreads all over core 22 basically, and encloses 24 places against chamber 23 O shape basically.Along with the increase of pressure, assembly 2 pushes against the wall 38 of chamber 23, and O shape circle 26 contacts the additional seal power that acts on assembly 2 rear sides with acquisition basically with this wall, and this will detail below.

An advantage of black box 2 is to use the rod-type material so that the production of core 22 and two

O shape circles

24,26 is direct relatively and rapid.Another advantage is to compare the wearing and tearing that not only reduced assembly 2 with traditional Sealing, mainly is that internal surface has also proved this point against plunger 20 in use simultaneously.Because this wearing and tearing produce gradually, so it allows relatively simply to change.

In plunger pump 4, in induction stroke or when static, black box 2 cooperates with the surface area 34 of fluid cylinder head 6.Preceding O shape circle 24 seals cores 22 against fluid cylinder head 6 along surface area 36.Back O shape circle 26 slightly contacts with the surface area 38 of seal backup disc 8, and seals surface area 40 cores of core 22 against plunger 20.Get into or induction stroke during or when static (Fig. 4 A), black box 2 makes in the pump 4 and keeps negative pressure.Seal abutment surfaces 36 through O shape circle 24, and seal abutment surface 40, can realize above-mentioned negative pressure through the tensile elasticity of core 22.

In discharge or compression stroke (Fig. 4 B), active force acts on the surface 34.See from the direction of cylinder body, axially promote core 22 backward along plunger 20.Sealing between core 22 and the fluid cylinder head 6 obtains on surface 36 through O shape circle 24.Along with core 22 is pushed rearward movingly, O shape circle 26 is promoted or compression by surface area 38 in groove 32.Groove 32 is configured to almost completely hold compressed O shape circle 26.Because surface area 38 specific surfaces zone 34 is little, the place ahead pressure in the pressure ratio abutment surface zone 34 that produces in the groove 32 of core 22 is bigger.This causes sealing force to act on the surface area 40 on the plunger 20, thereby realizes fit sealing.Through will discharge or compression stroke in force profile 42 (Fig. 4 B) and induction stroke in or force profile 44 (Fig. 4 A) during position of rest compare, just can illustrate this point.This also makes and has formed the sealing force relevant with applied pressure in the inboard of pump 4.It is minimum that this automatic transformation of the sealing force that applies drops to wearing and tearing.In addition, in illustrated embodiment, use standard material.Experiment is presented at pressure and rose to for 2000 whens crust, and the black box running is normal.

In alternate embodiments 46, a kind of sealing core 48 (Fig. 5) is provided.O shape circle 50 and back O shape circle 52 before sealing core 48 is provided with.Of preamble, in piston embodiment 46, core 48 uses the O shape circle 50 of the piston side that is arranged on core 48 to be sealed to piston 54.For back O shape circle 52, its function and mentioned above similar.

It will be appreciated that only from the diagram purpose, similarly method is used other size to the size that provides in the foregoing description.The employed material type of each parts also is like this.

The present invention is not limited to the preferred embodiment of foregoing description.Accompanying Claim defines each item right of the presently claimed invention, in claim scope of the present invention, can implement various modifications to the present invention.

Claims

1. black box that is used for packed-piston or plunger comprises:

-can be placed on the sealing core in the chamber, wherein said in use piston or plunger move with respect to said chamber;

-preceding seal arrangement; With

-back seal arrangement, wherein said in use sealing core moves with respect to said chamber, thereby obtains sealing force.

2. black box as claimed in claim 1 is characterized in that, said sealing core is arranged in the chamber of fluid cylinder head.

3. according to claim 1 or claim 2 black box is characterized in that said sealing core comprises polymer material, preferably ultra-high molecular weight polyethylene.

4. like claim 1,2 or 3 described black boies, it is characterized in that said sealing core is provided with opening with holes, wherein plunger is arranged in the said opening in use, and the size in wherein said hole is littler than the size of said plunger or piston.

5. like each described black box among the claim 1-4, it is characterized in that the outside dimension of said sealing core is less than the size of said chamber.

6. like each described black box among the claim 1-4, it is characterized in that the outside dimension of said sealing core is greater than the size of said chamber, and the size in said hole is greater than the size of said plunger or piston.

7. like each described black box among the claim 1-6, it is characterized in that, make the material of said sealing core receive stress in use.

8. like each described black box among the claim 1-7, it is characterized in that the seal arrangement sealing of said in use back is against the supporting zone of main body.

9. black box as claimed in claim 8 is characterized in that, said in use preceding seal arrangement is arranged in the groove of said sealing core with the back seal arrangement, and said groove is slightly less than compressed back seal arrangement.

10. like claim 8 or 9 described black boies, it is characterized in that supporting zone is less than the front region of said sealing core.

11. device that is provided with like each described black box among the claim 1-10.

12. an encapsulating method comprises the step that provides like each described black box among the claim 1-10.