GB2039620A - Compressor or displacement pump - Google Patents
Compressor or displacement pump Download PDFInfo
- Publication number
- GB2039620A GB2039620A GB7943258A GB7943258A GB2039620A GB 2039620 A GB2039620 A GB 2039620A GB 7943258 A GB7943258 A GB 7943258A GB 7943258 A GB7943258 A GB 7943258A GB 2039620 A GB2039620 A GB 2039620A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compressor
- electric motor
- compression
- displacement pump
- displacement
- 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
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 239000010687 lubricating oil Substances 0.000 claims abstract description 11
- 238000003475 lamination Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- 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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
-
- 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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/128—Crankcases
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
A compressor or displacement pump comprises a compression or displacement portion (1) driven through a crank shaft (16) by an electric motor (2) and an undivided casing (3) housing both the motor (2) and the compression or displacement portion (1), the casing having a lubricating oil bath (7) extending substantially the entire length of the casing (3) and into which the electric motor (2) dips. <IMAGE>
Description
SPECIFICATION
Compressor or displacement pump
The invention relates to compressors or displacement pumps, the compression or displacement portion of which is driven by an electric motor coupled to the drive shaft of the compressor or displacement portion.
With commerciallywell-known piston compressors of this type the compression or displacement portion and the electric motor are fitted with their own individual casings, the compressor or displacement pump casing having a tank at the bottom filled with lubricating oil. The rotor shaft extending from the electric motor into the compressor or displacement pump casing for transmission of the drive must be sealed off therefore and a seal located in the dividing wall between two casings is used to achieve this. This seal is subject to wear member and has to be exchanged from time to time. Each time it is replaced, the electric motor arranged in front of it has to be dismantled. Moreover, this design makes it necessary for the lubricating oil to be topped up frequently and this process requires careful supervision.Furthermore, dissipation of the resultant heat from the compressor gives rise to considerable difficulties.
The invention seeks to provide a better construction for a compressor or displacement pump, which should make it possible to dissipate the heat more advantageously and make it easier to maintain and repair.
According to the invention, there is provided a compressor or displacement pump comprising a compression or displacement portion driven by a crank shaft and an electric motor coaxial with the crank shaft, wherein an undivided common drive casing is provided for the compression or displacement portion and the electric motor, and a lubrication oil bath is provided extending substantially the entire length of the casing and into which the electric motor dips.
The drive casing which houses the electric motor together with the compression or displacement part enables an enlargement of the lubricating oil bath over the entire available length of the casing.
Preferably an additional balance bore in the stack of stator laminations andzor a balance channel in the drive casing is also used. It is apparent from this that the heat arising in the compressor or displacement device may also be dissipated by means of the electric motor dipping in the lubricating oil bath. At the same time there may be substantial reduction in noise. Furthermore the seal which, previously, was present between the compressor or displacement part and the electric motor may be moved to the
B-side or the outside end of the electric motor where it is much more easily accessible for occasions when it has to be exchanged. Similarly the possibility of a largerquantity of lubricating oil makes it possible to check the oil less frequently and thus the danger of the apparatus running dry may be as good as eliminated.
The shorter type of construction of the compressor or displacement pump which has become possible has the advantage that the fan normally provided on the B-side or the outside of the electric motor may act directly on the compressor head inasmuch as its mutual spacing have become considerably smaller.
In addition, the rotor shaft of the electric motor and the crankshaft of the compressor part may be constructed as a single piece drive shaft which is mounted only at its two ends. Moreover, it is possible to allow the flywheel mass of the compressor part to lie in the coil winding head of the stack of stator laminations, facing the crankshaft of the compressor, and to achieve savings in space in this way too.
Finally, the vent necessary in the common drive casing of the compressor part and the electric motor for the purpose of equalising the pressure, may be moved to the B-side or outside end of the electric motor. This makes it possible to reduce the oil escaping from the vent because there is no spray from the oil bath at this point, whereas there is spray in the crank chamber of the compressor part.
The invention will now be described in greater detail by way of example, with reference to the drawings, in which:
Figure 1 shows the axial section through a piston compressor in accordance with the invention, and
Figure 2 shows a section on the line A-B of Figure 1.
A piston compressor comprises a compressor part 1 and an electric motor part 2 driving it. These parts are housed in a common drive casing 3 which is not subdivided and which carries a compressor head 4.
The casing 3 is closed at both ends by bearing plates 5 and 6 and inside it houses a lubricating oil bath 7.
This lubricating oil bath 7 into which the electric motor 2 dips is designed to extend along the entire available length of the drive casing 3 in order to improve the dissipation of heat from the compressor. For this purpose an equalising bore 9 is provided in the stack of stator laminations 8 of the electric motor 2 as shown in Figure 1 or an equalising running at the lowest level of the drive casing 3 as can be seen from Figure 2.
A drive shaft 13 is supported in bearings 11 and 12 only at its two ends and forms both the rotor shaft 14 for the rotor 15 which rotates in the stack of stator laminations 8 of the electric motor 2 and the crankshaft 16 of the compressor part 1. It is therefore constructed in one piece. While a piston rod 18 which moves a compressor piston 17 is mounted on the crankshaft 16 at one end, a fan wheel 19 which cools the electric motor 2 is located on the other end of B-side and of the rotor shaft 14 and serves to dissipate the heat from the compressor which has been absorbed by the lubricating oil bath 7. At the same time a flow of air produced by the fan wheel and this air is directed by an appropriately shaped fan cover 20 onto the compressor head 4 so that it is also cooled directly thereby.
The flywheel mass 21 of the compressor part 1 may lie within the coil winding head 22 of the stack of stator laminations 8, facing the crankshaft 16, because of the individual construction of the drive casing 3. This makes the construction length of the compressor or displacement device still shorter.
Moreover, it is possible to move the vent 23, which is required to equalise the pressure in the drive casing 3, to the outer end of the electric motor 2 and thus to reduce the outlet of sprayed oil significantly. A slide ring seal 24 which is to be exchanged from time to time as a wear member and is now located in the rear bearing plate, 6, may also be replaced very easily, since only the fan wheel 19 and the fan cover 20 have to be removed from the drive shaft 13 or the drive casing 3 in order to do this.
Claims (7)
1. A compressor or displacement pump comprising a compression or displacement portion, driven by a crank shaft and an electric motor coaxial with the crank shaft, wherein an undivided common drive casing is provided for the compression or displacement portion and the electric motor, and a lubrication oil bath is provided extending substantially the entire length of the casing and into which the electric motor dips.
2. A compressor or displacement pump as claimed in Claim 1 wherein a bore hole for balancing the lubricating oil is provided in a stack of stator laminations for the electric motor.
3. A compressor or displacement pump as claimed in Claim 1 or2 wherein, a balance channel is provided in the stock of stator laminations for the motor for the lubricating oil bath in the common casing the balance channel running at least over the length of the stack of stator laminations at its lowest region.
4. A compressor or displacement pump as claimed in Claim 1,2 or 3, wherein the rotor shaft for the electric motor and the crankshaft of the compression or displacement portion comprises a single piece drive shaft and means are provided for mounting the drive shaft only at its two ends.
5. A compressor or displacement pump as claimed in any of the Claims 1 to 4, wherein a flywheel mass for the compression or displacement portion lies within a coil winding head of the electric motor facing the crankshaft.
6. A compressor or displacement pump as claimed in any of Claims 1 to 5, wherein a vent for equalising the pressure in the common drive casing is located at the end of the electric motor away from the compression or displacement portion.
7. A compression or displacement pump substantially as described herein with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782854519 DE2854519A1 (en) | 1978-12-16 | 1978-12-16 | COMPRESSOR OR DISPLACER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2039620A true GB2039620A (en) | 1980-08-13 |
| GB2039620B GB2039620B (en) | 1983-05-11 |
Family
ID=6057475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7943258A Expired GB2039620B (en) | 1978-12-16 | 1979-12-14 | Compressor or displacement pump |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT363163B (en) |
| BE (1) | BE880333A (en) |
| DE (1) | DE2854519A1 (en) |
| FR (1) | FR2444175A1 (en) |
| GB (1) | GB2039620B (en) |
| IT (1) | IT1120399B (en) |
| NL (1) | NL7908544A (en) |
| SE (1) | SE437859B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT387677B (en) * | 1981-04-18 | 1989-02-27 | Kaercher Gmbh & Co Alfred | ENGINE PUMP UNIT FOR A HIGH PRESSURE CLEANING DEVICE |
| WO2002057630A1 (en) * | 2001-01-17 | 2002-07-25 | Active Tools A/S | Air compressor unit |
| WO2006066597A1 (en) * | 2004-12-22 | 2006-06-29 | Active Tools A/S | A compression chamber unit and a method for forming such unit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3419177C1 (en) * | 1984-05-23 | 1985-01-31 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Drive device with a rotary drive motor |
| ES534631A0 (en) * | 1984-07-26 | 1985-10-16 | Gabarros Rovira Salvador | COMPRESSOR COMPRESSOR APPARATUS FOR COMPRESSED AIR |
| DE3513472C2 (en) * | 1985-04-15 | 1995-04-27 | Heilmeier & Weinlein | Hydraulic motor-pump unit |
| FR2622064A1 (en) * | 1987-10-16 | 1989-04-21 | Normandie Moteurs Electr | Electric machine with cooling by liquid fluid |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2283024A (en) * | 1938-12-01 | 1942-05-12 | Westinghouse Electric & Mfg Co | Air conditioning apparatus |
| US2583583A (en) * | 1948-10-20 | 1952-01-29 | John R Mangan | Compressor pump |
| FR1017693A (en) * | 1950-05-12 | 1952-12-17 | Improvements to dynamos intended to recharge accumulators | |
| US2741424A (en) * | 1951-06-22 | 1956-04-10 | Servel Inc | Refrigeration |
| US2751145A (en) * | 1952-10-21 | 1956-06-19 | Gen Motors Corp | Refrigerating apparatus |
| US3008629A (en) * | 1957-10-03 | 1961-11-14 | Carrier Corp | Compressor |
| DE1093387B (en) * | 1957-12-14 | 1960-11-24 | Linde S Eismaschinen Ag Zweign | Lubricating device for motor compressors of refrigeration machines of small and medium power using oil conveyor discs |
| GB1248914A (en) * | 1967-12-04 | 1971-10-06 | Dewandre Co Ltd C | Improvements in or relating to boosted hydraulic systems |
| US4097185A (en) * | 1976-09-13 | 1978-06-27 | Tecumseh Products Company | Lubricating device |
| US4131396A (en) * | 1977-04-07 | 1978-12-26 | Sundstrand Corporation | Hermetic compressor lubrication system with two-stage oil pump |
-
1978
- 1978-12-16 DE DE19782854519 patent/DE2854519A1/en not_active Withdrawn
-
1979
- 1979-11-22 AT AT0742579A patent/AT363163B/en not_active IP Right Cessation
- 1979-11-23 NL NL7908544A patent/NL7908544A/en not_active Application Discontinuation
- 1979-11-29 BE BE0/198348A patent/BE880333A/en not_active IP Right Cessation
- 1979-12-07 FR FR7930054A patent/FR2444175A1/en active Granted
- 1979-12-11 IT IT04848/79A patent/IT1120399B/en active
- 1979-12-11 SE SE7910172A patent/SE437859B/en unknown
- 1979-12-14 GB GB7943258A patent/GB2039620B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT387677B (en) * | 1981-04-18 | 1989-02-27 | Kaercher Gmbh & Co Alfred | ENGINE PUMP UNIT FOR A HIGH PRESSURE CLEANING DEVICE |
| WO2002057630A1 (en) * | 2001-01-17 | 2002-07-25 | Active Tools A/S | Air compressor unit |
| WO2006066597A1 (en) * | 2004-12-22 | 2006-06-29 | Active Tools A/S | A compression chamber unit and a method for forming such unit |
| CN101087952B (en) * | 2004-12-22 | 2010-12-01 | 冠翔（香港）工业有限公司 | Compression chamber unit and method of forming such a unit |
| US7900550B2 (en) | 2004-12-22 | 2011-03-08 | Active Tools International (Hk) Ltd. | Compression chamber unit and a method for forming such unit |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7910172L (en) | 1980-06-17 |
| ATA742579A (en) | 1980-12-15 |
| IT7904848A0 (en) | 1979-12-11 |
| NL7908544A (en) | 1980-06-18 |
| FR2444175A1 (en) | 1980-07-11 |
| GB2039620B (en) | 1983-05-11 |
| IT1120399B (en) | 1986-03-19 |
| FR2444175B3 (en) | 1981-10-23 |
| AT363163B (en) | 1981-07-10 |
| SE437859B (en) | 1985-03-18 |
| BE880333A (en) | 1980-03-17 |
| DE2854519A1 (en) | 1980-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |