CN104963910A - Differential pressure adjusting cylinder for mechanical seal - Google Patents
Differential pressure adjusting cylinder for mechanical seal Download PDFInfo
- Publication number
- CN104963910A CN104963910A CN201510314713.XA CN201510314713A CN104963910A CN 104963910 A CN104963910 A CN 104963910A CN 201510314713 A CN201510314713 A CN 201510314713A CN 104963910 A CN104963910 A CN 104963910A
- Authority
- CN
- China
- Prior art keywords
- end cap
- cylinder barrel
- piston
- sealing
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7052—Single-acting output members
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a differential pressure adjusting cylinder for mechanical seal. The differential pressure adjusting cylinder for mechanical seal comprises a cylindrical shell, and first and second end covers at the two ends, wherein the cylindrical shell has a cylinder barrel inside; and a first gap and a heat exchange coil are arranged between the cylinder barrel and the cylindrical shell. The lower end of the cylinder barrel and the inner side surface of the second end cover are tightly connected; and a second gap is left between the upper end of the cylinder barrel and the lower side surface of the first end cover. A rod hole is formed in the center of the first end cover; a transparent glass pipe is arranged at the outer side of the first end cover; and the periphery of one end of the transparent glass pipe is connected to the periphery of the rod hole. A piston rod is arranged in the rod hole; the inner end of the piston rod extends into the cylinder barrel, and is connected with a piston; and a liquid sealing cavity and a medium cavity are respectively formed in the two sides of the piston. The outer end of the piston rod penetrates through the first end cover to extend into the transparent glass pipe. A sealing liquid inlet is formed in the outer circle of the first end cover; and a medium inlet and a sealing liquid outlet are formed in the second end cover. The differential pressure adjusting cylinder for mechanical seal can prolong the service life of a mechanical sealing system, can supply sealing liquid to a machine pump and a mechanical sealing auxiliary system, and prevents a medium in the machine pump from leaking.
Description
Technical field
The present invention relates to a kind of oil hydraulic cylinder.Specifically, be used to as pump and Mechanical Seal Auxiliary System provide sealing fluid, avoid the differential voltage regulation cylinder that in pump, medium is revealed.
Background technique
At present at petrochemical field, be all adopt pipeline and pump to carry various fluid chemical raw material.Industrial chemicals mostly wherein is again inflammable and explosive, poisonous and harmful material.Therefore, when carrying inflammable and explosive, poisonous and harmful material, leakage that is inflammable and explosive, poisonous and harmful material must just be prevented.Conventional method arranges Mechanical Seal Auxiliary System in the wheel shaft one end near pump, sealing fluid is provided by Mechanical Seal Auxiliary System, make sealing fluid circulation between two-stage sealing, and make the pressure of sealing fluid higher than the pressure being transferred chemical material, thus play the effect intercepting and be transferred chemical material.But in actual production, if be transferred in pump chemical material pressure higher and fluctuation larger, sealed fluid pressure setting value in Seal cage outside pump just must higher than the pressure surge peak being transferred chemical material, sealing outside pump is run for a long time under high pressure operating mode, like this, the working life of mechanical sealing system can be shortened, make the working life of mechanical sealing system not long.
Summary of the invention
The problem to be solved in the present invention is to provide the differential voltage regulation cylinder of a kind of mechanical seal.Adopt the differential voltage regulation cylinder of this mechanical seal, can working life of prolonged mechanical sealing system.
The problems referred to above that the present invention will solve are realized by following technological scheme:
The differential voltage regulation cylinder of mechanical seal of the present invention comprises tubular shell, tubular shell two ends are connected with the first end cap and the second end cap respectively, cylinder barrel is had in tubular shell, the external diameter of cylinder barrel is less than tubular shell internal diameter, make between cylinder barrel and tubular shell, to form the first spacing, have heat exchange coil pipe in first spacing, the two ends of heat exchange coil pipe all extend through after the second end cap.Linking together in sealing shape between described cylinder barrel lower end and the second rubbing surface of end cover, between cylinder barrel upper end and the first end cap downside, leaving the second spacing.First end cap central has rod aperture, has transparent glass tube outside the first end cap, and one end surrounding of transparent glass tube is connected to the surrounding of described rod aperture.Be installed with piston rod in rod aperture, piston rod inner end to be stretched in cylinder barrel and is connected with piston, forms sealing liquid chamber, form media cavity by that section of inner cavity of cylinder between piston and the second end cap by that section of inner cavity of cylinder between piston and the first end cap.Described piston rod outer end is stretched in transparent glass tube through after the first end cap.The cylindrical of the first end cap has sealing fluid import, the import of sealing liquid all communicates with sealing liquid chamber and the first spacing.Second end cap has medium entrance 91 and seal fluid outlet, described medium entrance and seal fluid outlet are corresponding with the first spacing with media cavity respectively and be communicated with.
Further improvement of the present invention scheme is, the overhanging end of piston rod has liquid level mark block.
Further improvement project of the present invention is, first end has covered pressure gauge, thermometer or pressure transmitter mount inlet.
As can be seen from the above scheme, because the differential voltage regulation cylinder of mechanical seal of the present invention comprises tubular shell, tubular shell two ends are connected with the first end cap and the second end cap respectively, cylinder barrel is had in tubular shell, the external diameter of cylinder barrel is less than tubular shell internal diameter, make to form the first spacing between cylinder barrel and tubular shell, have heat exchange coil pipe in the first spacing, the two ends of heat exchange coil pipe all extend through after the second end cap.Linking together in sealing shape between described cylinder barrel lower end and the second rubbing surface of end cover, between cylinder barrel upper end and the first end cap downside, leaving the second spacing; First end cap central has rod aperture, and the first end cap outer side surface has transparent glass tube, and one end surrounding of transparent glass tube is connected to the surrounding of described rod aperture.Be installed with piston rod in rod aperture, piston rod inner end to be stretched in cylinder barrel and is connected with piston, forms sealing liquid chamber, form media cavity by that section of inner cavity of cylinder between piston and the second end cap by that section of inner cavity of cylinder between piston and the first end cap.Described piston rod outer end is stretched in transparent glass tube through after the first end cap.The cylindrical of the first end cap has sealing fluid import, the import of sealing liquid all communicates with sealing liquid chamber and the first spacing.Second end cap has medium entrance and seal fluid outlet, described medium entrance and seal fluid outlet are corresponding with the first spacing with media cavity respectively and be communicated with.Under working state, the sealing fluid import that sealing fluid is covered by first end enters in Seal cage, produces a downward active force to piston.Medium enters media cavity from the medium entrance of this second end cap, produces an active force upwards to piston.Because the upper surface of piston is connected with one end of piston rod, piston rod upper surface area is made to be less than the area of its lower surface, as can be seen from pressure formula P=F/S, the pressure that piston upper surface is subject to must be greater than the pressure that its lower surface is subject to, namely sealing liquid chamber is greater than media cavity pressure, pressure ratio is the inverse ratio of piston surface area, is a fixed value.When the pressure medium in pump fluctuates, pressure in media cavity is also along with fluctuation, pressure in sealing liquid chamber is also greater than the pressure in media cavity all the time by certain supercharging amplitude fluctuation by piston, not only prevent the dielectric leakage in pump, also achieve the automatic adjustment of working pressure.The situation that the sealing normal phase outside pump that avoids is run under high pressure operating mode, thus extend the working life of mechanical sealing system.
Accompanying drawing explanation
Fig. 1 is the differential voltage regulation cylinder structural representation of mechanical seal of the present invention.
Embodiment
As shown in Figure 1, the differential voltage regulation cylinder of mechanical seal of the present invention comprises tubular shell 4, tubular shell 4 two ends are connected with the first end cap 11 and the second end cap 1 respectively, cylinder barrel 5 is had in tubular shell 4, the external diameter of cylinder barrel 5 is less than tubular shell 4 internal diameter, make to form the first spacing 6 between cylinder barrel 5 and tubular shell 4, be provided with heat exchange coil pipe 3 in described first spacing 6, the two ends of heat exchange coil pipe 3 all extend through after the second end cap 1.Linking together in sealing shape by seal ring 2 between described cylinder barrel 5 lower end and the second end cap 1 inner side surface, between cylinder barrel 5 upper end and the first end cap 11 downside, leaving the second spacing 13.First end cap 11 center is processed with rod aperture, and the first end cap 11 arranged outside has transparent glass tube 9, and one end surrounding of transparent glass tube 9 is connected to the surrounding of described rod aperture.Be installed with piston rod 8 in described rod aperture, piston rod 8 inner end to be stretched in cylinder barrel 5 and is connected with piston 15, forms sealing liquid chamber 14, form media cavity 16 by that section of cylinder barrel 5 inner chamber between piston 15 and the second end cap 1 by that section of cylinder barrel 5 inner chamber between piston 15 and the first end cap 11.Described piston rod 8 outer end is stretched in transparent glass tube 9 through after the first end cap 1.Wherein, the overhanging end of piston rod 8 is connected with liquid level mark block 10.The cylindrical of the first end cap 11 is processed with sealing fluid import 7, and the import of sealing liquid all communicates with sealing liquid chamber 14 and the first spacing 6.Second end cap 1 is processed with medium entrance 18 and seal fluid outlet 17, described medium entrance 18 and seal fluid outlet 17 are corresponding with the first spacing 6 with media cavity 16 respectively and be communicated with.
The mount inlet 12 for setting pressure table, thermometer or pressure transmitter is processed with in the both sides of the first end cap 11.
During work, sealing fluid enters in sealing liquid chamber 14 and produces a downward active force to piston 15, and medium enters media cavity 16 pairs of pistons 15 and produces an active force upwards.When piston 15 balances, suffered by its upper and lower surface, active force is equal.And the area of piston 15 upper surface is less than the area of its lower surface, according to pressure formula P=F/S, the pressure that piston 15 upper surface is subject to must be greater than the pressure that its lower surface is subject to, that is, the pressure in sealing liquid chamber 14 is greater than the pressure of media cavity 16, and the pressure ratio of the two is the inverse ratio of the two surface area, is a fixed value.When the pressure medium in pump fluctuates, the pressure of media cavity 16 is also with fluctuating thereupon, the pressure in sealing liquid chamber 14 is also also greater than the pressure of media cavity 16 all the time by certain supercharging amplitude fluctuation by piston 15, thus while prevention dielectric leakage, also achieve the automatic adjustment of working pressure.
Claims (3)
1. the differential voltage regulation cylinder of mechanical seal, comprise tubular shell (4), tubular shell (4) two ends are connected with the first end cap (11) and the second end cap (1) respectively, cylinder barrel (5) is had in tubular shell (4), the external diameter of cylinder barrel (5) is less than tubular shell (4) internal diameter, make to form the first spacing (6) between cylinder barrel (5) and tubular shell (4), have heat exchange coil pipe (3) in the first spacing (6), the two ends of heat exchange coil pipe (3) all extend through after the second end cap (1); Linking together in sealing shape between described cylinder barrel (5) lower end and the second end cap (1) inner side surface, between cylinder barrel (5) upper end and the first end cap (11) downside, leaving the second spacing (13); There is rod aperture at first end cap (11) center, and there is transparent glass tube (9) in the first end cap (11) outside, and one end surrounding of transparent glass tube (9) is connected to the surrounding of described rod aperture; Piston rod (8) is installed with in rod aperture, piston rod (8) inner end to be stretched in cylinder barrel (5) and is connected with piston (15), form sealing liquid chamber (14) by that section of cylinder barrel (5) inner chamber between piston (15) and the first end cap (11), form media cavity (16) by that section of cylinder barrel (5) inner chamber between piston (15) and the second end cap (1); Described piston rod (8) outer end is stretched in transparent glass tube (9) through after the first end cap (11); The cylindrical of the first end cap (11) has sealing fluid import (7), the import of sealing liquid all communicates with sealing liquid chamber (14) and the first spacing (6); Second end cap (1) has medium entrance (18) and seal fluid outlet (17), described medium entrance (18) and seal fluid outlet (17) are corresponding with the first spacing (6) with media cavity (16) respectively and be communicated with.
2. the differential voltage regulation cylinder of mechanical seal according to claim 1, the overhanging end that it is characterized in that piston rod (8) has liquid level mark block (10).
3. the differential voltage regulation cylinder of mechanical seal according to claim 1 and 2, is characterized in that the first end cap (11) having pressure gauge, thermometer or pressure transmitter mount inlet (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510314713.XA CN104963910B (en) | 2015-06-10 | 2015-06-10 | The differential voltage regulation cylinder of mechanical seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510314713.XA CN104963910B (en) | 2015-06-10 | 2015-06-10 | The differential voltage regulation cylinder of mechanical seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104963910A true CN104963910A (en) | 2015-10-07 |
| CN104963910B CN104963910B (en) | 2017-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510314713.XA Active CN104963910B (en) | 2015-06-10 | 2015-06-10 | The differential voltage regulation cylinder of mechanical seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104963910B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402081A (en) * | 2016-10-28 | 2017-02-15 | 福斯流体控制（苏州）有限公司 | Pressure following sealing liquid isolation system used for mechanical sealing |
| CN106958557A (en) * | 2017-05-04 | 2017-07-18 | 芜湖市海联机械设备有限公司 | A kind of actuating cylinder |
| CN110259755A (en) * | 2019-05-31 | 2019-09-20 | 武汉船用机械有限责任公司 | Hydraulic cylinder |
| CN111963905A (en) * | 2020-08-03 | 2020-11-20 | 西安泵阀总厂有限公司 | Automatic blocking liquid pressure regulating system for pressure double sealing |
Citations (6)
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|---|---|---|---|---|
| JPH112210A (en) * | 1997-06-12 | 1999-01-06 | Sanyo Seiki Kk | Cylinder actuator |
| JP2004011855A (en) * | 2002-06-10 | 2004-01-15 | Smc Corp | Cylinder with speed control mechanism |
| DE102006025696A1 (en) * | 2006-06-01 | 2007-12-06 | Trw Automotive Gmbh | Piston cylinder unit, has piston movable in cylinder, pressure chamber with pressure connector, and pressure limiting pipe attached to valve element in piston |
| CN201891691U (en) * | 2010-11-02 | 2011-07-06 | 中冶连铸技术工程股份有限公司 | Double-acting hydraulic plunger cylinder |
| CN203655776U (en) * | 2013-12-26 | 2014-06-18 | 海卓泰克液压技术（苏州）有限公司 | Variable pitch oil cylinder |
| CN204729385U (en) * | 2015-06-10 | 2015-10-28 | 无锡博伊特科技股份有限公司 | The differential voltage regulation cylinder of mechanical seal |
-
2015
- 2015-06-10 CN CN201510314713.XA patent/CN104963910B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH112210A (en) * | 1997-06-12 | 1999-01-06 | Sanyo Seiki Kk | Cylinder actuator |
| JP2004011855A (en) * | 2002-06-10 | 2004-01-15 | Smc Corp | Cylinder with speed control mechanism |
| DE102006025696A1 (en) * | 2006-06-01 | 2007-12-06 | Trw Automotive Gmbh | Piston cylinder unit, has piston movable in cylinder, pressure chamber with pressure connector, and pressure limiting pipe attached to valve element in piston |
| CN201891691U (en) * | 2010-11-02 | 2011-07-06 | 中冶连铸技术工程股份有限公司 | Double-acting hydraulic plunger cylinder |
| CN203655776U (en) * | 2013-12-26 | 2014-06-18 | 海卓泰克液压技术（苏州）有限公司 | Variable pitch oil cylinder |
| CN204729385U (en) * | 2015-06-10 | 2015-10-28 | 无锡博伊特科技股份有限公司 | The differential voltage regulation cylinder of mechanical seal |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402081A (en) * | 2016-10-28 | 2017-02-15 | 福斯流体控制（苏州）有限公司 | Pressure following sealing liquid isolation system used for mechanical sealing |
| CN106958557A (en) * | 2017-05-04 | 2017-07-18 | 芜湖市海联机械设备有限公司 | A kind of actuating cylinder |
| CN106958557B (en) * | 2017-05-04 | 2018-01-26 | 芜湖市海联机械设备有限公司 | A kind of actuating cylinder |
| CN110259755A (en) * | 2019-05-31 | 2019-09-20 | 武汉船用机械有限责任公司 | Hydraulic cylinder |
| CN111963905A (en) * | 2020-08-03 | 2020-11-20 | 西安泵阀总厂有限公司 | Automatic blocking liquid pressure regulating system for pressure double sealing |
| CN111963905B (en) * | 2020-08-03 | 2021-11-16 | 西安泵阀总厂有限公司 | Automatic blocking liquid pressure regulating system for pressure double sealing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104963910B (en) | 2017-03-15 |
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Denomination of invention: Differential pressure regulating cylinder for mechanical seal Effective date of registration: 20230106 Granted publication date: 20170315 Pledgee: Agricultural Bank of China Limited by Share Ltd. Wuxi Huishan branch Pledgor: WUXI BOIT TECHNOLOGY Co.,Ltd. Registration number: Y2023980030573 |