GB2142413A - Plunger construction for pump - Google Patents
Plunger construction for pump Download PDFInfo
- Publication number
- GB2142413A GB2142413A GB08317839A GB8317839A GB2142413A GB 2142413 A GB2142413 A GB 2142413A GB 08317839 A GB08317839 A GB 08317839A GB 8317839 A GB8317839 A GB 8317839A GB 2142413 A GB2142413 A GB 2142413A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plunger
- ceramic
- mandrel
- forces
- pump
- 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.)
- Withdrawn
Links
- 238000010276 construction Methods 0.000 title claims description 3
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000009172 bursting Effects 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
- F04B53/147—Mounting or detaching of piston rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
- F16B11/008—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing of tubular elements or rods in coaxial engagement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/85—Ceramic-to-metal-connections
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A plunger for a plunger pump, being a composite, reciprocable mechanical component, wherein two members (10, 11) with a gap between them but also in axial contact (12) are joined by an elastomeric bonding material (13) disposed in the gap, whereby forces can be transmitted from one member to the other in one direction through said axial contact and in the opposite direction through the bonding material. Alternative configurations are illustrated in Figs. D and E (not shown). <IMAGE>
Description
SPECIFICATION
Plunger
The invention relates to composite, reciprocable mechanical components, particularly to composite plungers for plunger pumps.
The type of pump that is relevant to the invention is a pump having a reciprocating plunger or piston moving inside a stationary cylinder and carried by a metal cross-head. There is normally a stationary seal located in the cylinder which bears on the outside cylindrical surface of the plunger. On the withdrawal stroke water, or other fluid, is drawn into the cylinder, and on the power stroke the fluid is displaced by the plunger at pressures as high as 1500 bars, though the majority of pumps work at around 250 bars or less.
The plunger is often made of ceramic materials (frequently alumina), since these materials not only withstand the compressive mechanical forces applied to them during the power stroke very well, but also are corrosion resistant, and give a good life to the normally elastomeric seals on which they rub, through the special nature of their surface finish.
There is always a problem of fixing the ceramic
plunger to the cross-head in such a way that
a) The ceramic plunger and the cross-head are coaxial within fine limits (if they are not then poor sealing and possible breakage of the ceramic will occur in service).
b) There is no appreciable tensile stress applied to the ceramic.
c) There is no possible secondary leak path such that the high pressure water or other fluid pumped can contaminate the oil on the cross-head side of the assembly, or build up an internal pressure inside a
hollow ceramic plunger and thus give rise to bursting forces, or simply reduce the efficiency of the
pump by allowing leakage.
Sketches A and B of the accompanying drawings show typical arrangements that are commonly used at present. The arrangement shown in sketch A is an expensive arrangement to make because the inter
nal diameter locating areas and both ends 2,3 of the ceramic 4 have to be ground to fit the plunger
mandrel 5. Also a secondary leakpath exists around the fixing nut 6 at the high pressure end. If the gap
between the steel mandrel and the ceramic is tightly sealed, then there is the risk of breakage of the ceramic due to differential thermal expansion.
The arrangement of mandrel 7 and ceramic 8 shown in sketch B is also expensive, because it is normally necessary to finish the grinding of the ceramic external diameter after the glue filler 9 has set. Any misalignment of parts in this design will give rise to forces which may damage the glue bond and ultimately break the ceramic (axial force on the ceramic on the pressure stroke can be as high as 10 tons).
The aim of the invention is to improve on these prior plungers and give an efficient and economically produced design.
To this end the invention provides a composite,
reciprocable mechanical compnent, particularly a plunger for a plunger pump, wherein two members with a gap betweem then but also in axial contact are joined by an elastomeric bonding material disposed in the gap, whereby forces can be transmitted from one member to the other in one direction through said axial contact and in the opposite direction through the bonding material.
In particular, in a plunger, one member may be a ceramic plunger head and the other a metal mandrel by means of which the plunger is reciprocated.
Thus in particularthe idea isto use a polymeric type material which is preferably vulcanised to provide a flexible elastic joint between the ceramic plunger and the mandrel. Such a construction will better withstand shock and vibration which would otherwise be likely to cause damage. Preferably, the polymeric material is chemically bonded to one or both of the components to prevent their separation or relative movement.
Further advantages of the invention, at least in its preferred forms described below are that: 1) the ceramic part can be made more economically as less expensive grinding proceeses are required;
2) the need for grinding after assembly is eliminated;
3) because the bond is flexible it is able to accommodate thermal expansion differences between the ceramic plunger and the steel mandrel that otherwise might lead to damage;
4) the flexible nature of the joint between the parts will tend to accommodate minor misalignments better than a rigid joint such as commonly used at present.
It may be noted that in all cases there can be ceramic - metal contact at the point at which the axial force is to be transmitted. The polymer only has to be strong enough to withstand the low suction, friction and inertia forces during the induction stroke.
In the accompanying drawings sketches C, D, E illustrate the invention, a steel mandrel being referenced 10 and an alumina ceramic plunger 11 in each case. The mandrels and plungers are in axial contact at 12, and gaps between them are filled with injection moulded rubber 13. The simplicity of the designs may be noted, particularly in sketch E. The design of sketch D is the same as that of sketch B except for the addition of a passage 14 for the injection moulding of the rubber, which passage need not necessarily be in the position shown. Parts are held in accurate register in the injection moulding tool, and so can be made to finished size before assembly.
1. A plunger for a plunger pump, being a composite, reciprocable mechanical component, wherein two members with a gap between them but also in axial contact are joined by an elastomeric bonding material disposed in the gap, whereby forces can be transmitted from one member to the other in one direction through said axial contact and in the opposite direction through the bonding material.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. A plunger for a plunger pump, being a composite, reciprocable mechanical component, wherein two members with a gap between them but also in axial contact are joined by an elastomeric bonding material disposed in the gap, whereby forces can be transmitted from one member to the other in one direction through said axial contact and in the opposite direction through the bonding material.
2. A plunger as claimed in Claim 1 and substantially as described with reference to or as shown by sketches C, D and E of the Drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08317839A GB2142413A (en) | 1983-06-30 | 1983-06-30 | Plunger construction for pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08317839A GB2142413A (en) | 1983-06-30 | 1983-06-30 | Plunger construction for pump |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8317839D0 GB8317839D0 (en) | 1983-08-03 |
GB2142413A true GB2142413A (en) | 1985-01-16 |
Family
ID=10545072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08317839A Withdrawn GB2142413A (en) | 1983-06-30 | 1983-06-30 | Plunger construction for pump |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2142413A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0197178A1 (en) * | 1985-04-10 | 1986-10-15 | Feldmühle Aktiengesellschaft | Production method for pistons of brittle material |
EP0863311A3 (en) * | 1997-03-07 | 1999-11-24 | Shimadzu Corporation | Liquid transfer pump |
DE102006025579B3 (en) * | 2006-06-01 | 2007-12-27 | Zf Friedrichshafen Ag | Piston rod for e.g. passenger car`s vibration damper, has axial transit channel via which mounting screw is guided, where thread connections provided by screw are accessible for adjustment of pre-stressing in each stroke position of rod |
IT201800004176A1 (en) * | 2018-04-03 | 2019-10-03 | PISTON IN CERAMIC MATERIAL | |
IT201900006680A1 (en) * | 2019-05-09 | 2020-11-09 | Annovi Reverberi Spa | PISTON IN CERAMIC MATERIAL |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1367939A (en) * | 1971-08-16 | 1974-09-25 | Jobling & Co James A | Plug devices |
-
1983
- 1983-06-30 GB GB08317839A patent/GB2142413A/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1367939A (en) * | 1971-08-16 | 1974-09-25 | Jobling & Co James A | Plug devices |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0197178A1 (en) * | 1985-04-10 | 1986-10-15 | Feldmühle Aktiengesellschaft | Production method for pistons of brittle material |
EP0863311A3 (en) * | 1997-03-07 | 1999-11-24 | Shimadzu Corporation | Liquid transfer pump |
DE102006025579B3 (en) * | 2006-06-01 | 2007-12-27 | Zf Friedrichshafen Ag | Piston rod for e.g. passenger car`s vibration damper, has axial transit channel via which mounting screw is guided, where thread connections provided by screw are accessible for adjustment of pre-stressing in each stroke position of rod |
IT201800004176A1 (en) * | 2018-04-03 | 2019-10-03 | PISTON IN CERAMIC MATERIAL | |
WO2019193437A1 (en) * | 2018-04-03 | 2019-10-10 | Annovi Reverberi S.P.A. | Piston made of ceramic material |
CN111936771A (en) * | 2018-04-03 | 2020-11-13 | 安诺维雷韦尔贝里有限公司 | Piston made of ceramic material |
US11149850B2 (en) | 2018-04-03 | 2021-10-19 | Annovi Reverberi S.P.A. | Piston made of ceramic material |
CN111936771B (en) * | 2018-04-03 | 2022-08-09 | 安诺维雷韦尔贝里有限公司 | Piston made of ceramic material |
IT201900006680A1 (en) * | 2019-05-09 | 2020-11-09 | Annovi Reverberi Spa | PISTON IN CERAMIC MATERIAL |
Also Published As
Publication number | Publication date |
---|---|
GB8317839D0 (en) | 1983-08-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |