EP0666961B1 - Air motor with means to prevent freezing - Google Patents
Air motor with means to prevent freezing Download PDFInfo
- Publication number
- EP0666961B1 EP0666961B1 EP94921742A EP94921742A EP0666961B1 EP 0666961 B1 EP0666961 B1 EP 0666961B1 EP 94921742 A EP94921742 A EP 94921742A EP 94921742 A EP94921742 A EP 94921742A EP 0666961 B1 EP0666961 B1 EP 0666961B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust
- air
- cylinder
- conduit
- control valve
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B11/00—Reciprocating-piston machines or engines without rotary main shaft, e.g. of free-piston type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B31/00—Component parts, details, or accessories not provided for in, or of interest apart from, other groups
- F01B31/02—De-icing means for engines having icing phenomena
Definitions
- This invention relates to an air motor of the kind comprising a cylinder, a piston movable within the cylinder, a piston rod coupled to the piston and extending from the cylinder, a control valve which controls the admission of compressed air to the opposite ends of the cylinder in turn, an actuating mechanism for the valve, said actuating mechanism acting to alter the setting of the control valve whereby as the piston attains a predetermined position as it approaches one end of the cylinder, the control valve will operate to admit compressed air to the one end of the cylinder to achieve reverse motion of the piston and vice versa, and means for allowing air to exhaust from the ends of the cylinder in turn.
- Such motors are well known in the art for driving reciprocating pumps, in particular pumps which deliver paint to a supply manifold.
- the aforesaid control valve also acts to control the escape of the exhaust air from the ends of the cylinder.
- the temperature of the air can fall to the extent that moisture in the air freezes and the ice formed can hinder the operation of the control valve and also cause a reduction in the effective cross sectional area of the various passages which convey the exhaust air thereby resulting in a reduction in the operating speed of the motor.
- the reduction in speed results in a reduced pressure in the aforesaid supply manifold which is unacceptable.
- the return stroke of the piston may be delayed leading to unacceptable fluctuation in the pressure in the manifold.
- US Patent No 3635125 discloses an air motor in which an exhaust muffler is provided with a flexible cover which can be flexed by back pressure in the exhaust to release ice formed in an outlet of the muffler.
- the object of the present invention is to provide an air motor of the kind specified in a simple and convenient form.
- an air motor of the kind specified comprises a pair of exhaust conduits communicating with the opposite ends of the cylinder respectively, a pair of exhaust control valves for controlling the flow of air through said conduits respectively, said exhaust control valves being responsive to the setting of said first mentioned control valve, each of the exhaust conduits being constructed so that as the exhaust air flows therethrough a substantial proportion of the air expansion takes place in a heat exchanger forming a part of the conduit removed from the exhaust control valve, said heat exchanger being configured to transfer ambient heat to the air expanding in said part of said conduit.
- the drawings illustrate an air motor for actuating a double acting piston pump which is intended to supply paint under pressure to a paint manifold which conveys the paint to a plurality of spray guns.
- the air motor comprises a hollow cylinder 10 which is sandwiched between upper and lower end walls 11, 12, these components being secured together by tie bolts.
- the lower end wall 12 is adapted to be secured to a mounting structure which also carries the pump and conveniently the motor is mounted above the pump.
- a control valve housing 15 in which is formed a valve chamber which houses a control valve in the form of a slide valve member 16.
- a further valve housing 28 is also mounted on the upper end wall a further valve housing 28 to be described.
- the valve member 16 by reason of a spring loaded detent mechanism (not shown) has an upper stable position in which it is shown in the drawing, and a lower stable position.
- the slide valve member 16 is movable between these positions by an actuating mechanism in the form of an actuating rod 17 which extends downwardly into the piston rod 13.
- a reduced portion of the actuating rod carries upper and lower abutment collars 18, 19 which are held in spaced relationship by a compression spring.
- the upper abutment collar 18 is engagable with a collar 20 secured within the piston rod and the lower abutment collar 19 is engagable with a step 21 defined in the piston rod.
- the operation of the actuating mechanism is such that with the valve member 16 in its upper position, air is supplied to the upper portion of the cylinder to move the piston downwardly.
- the collar 20 will engage with the upper abutment collar 18 and with continued movement of the piston the valve member 16 will move to its lower stable position so that air is supplied to the lower portion of the cylinder.
- the piston as a result moves upwardly and the process is repeated when the lower abutment collar 19 is engaged by the step 21 on the piston rod.
- Air under pressure from an external source is conveyed to a central port 22 in the valve housing 15. Conveniently the air is conveyed by an external pipe 23 which extends alongside the cylinder to an air inlet union 24 carried by the lower end wall 12. In its upper stable state the slide valve member connects the central port 22 with an upper port 25 and in its lower stable position the central port is connected to a lower port 26.
- the further valve housing 28 defines in conjunction with an insert 40 a valve chamber which contains a diaphragm 32 formed from synthetic resin material.
- the insert 40 has a circumferential groove 41 which by way of a transfer port 30 communicates with the upper portion of the cylinder.
- the insert 40 is provided with a central opening through which extends an exhaust conduit in the form of an exhaust pipe 31.
- the pipe 31 at its inner end is engageable by the diaphragm 32.
- Surrounding the inner end portion of the exhaust pipe is an annular recess 42 which is formed in the insert and the recess communicates with the circumferential groove by way of a plurality of blind drillings 43 which are formed in the inner end face of the insert, the drillings being formed before machining of the groove and recess.
- the effect of the drillings and the recess is to produce a discontinuous support surface for the outer portion of the diaphragm.
- the adjacent end wall of the further valve housing is recessed to allow for movement of the diaphragm away from the end of the pipe 31.
- a passage 29 formed in the further valve housing 28 connects the port 25 with the valve chamber, the entrance to the passage being enlarged to accommodate of a support insert 32A which is provided with a plurality of through apertures.
- a similar valve 33 is mounted on the lower end plate 12, this valve being connected to the lower port 26 of the slide valve by way of an external pipe 34.
- the valve 33 is provided with an exhaust pipe 35 and the two exhaust pipes are connected to an exhaust manifold 36 which leads to atmosphere through a silencer (not shown).
- valves operate very quickly in response to the change in position of the slide valve member 16 so that the pressure fluctuation in the paint manifold is minimised.
- the upper exhaust pipe 31 extends through a bell shaped cover 44 which extends downwardly to adjacent the lower end plate 12.
- the cover may have an internal coating of a sound deadening medium.
- the two exhaust pipes 31 and 35 are machined from solid material and for substantially half their length define a passage or as shown, a pair of passages 37 of reduced cross sectional area as compared with the remaining portion 38 of the passage.
- the passages 37 extend from the end of the pipe within the valve chamber and the reduced cross section of the passages ensure that the expansion of the air as it leaves the cylinder, tends to take place in the portion 38 of the passage. This of course is remote from the associated valve housing and outside the cover 37.
- the expansion of the air produces the cooling effect mentioned but the risk of ice formation within the passage 38 is reduced by the provision of integral fins 39 on the exhaust pipe.
- the fins assist heat exchange between the atmosphere and the wall of the pipe so that in use the risk of ice formation on the inner wall of the exhaust pipe is minimised.
- the risk of restriction to the flow of exhaust air is therefore minimised.
- the risk of ice formation within the exhaust control valve is minimised by ensuring that so far as possible, the air expands within the exhaust pipe.
- the main control valve controls only the admission of air to the cylinders there is no risk of ice formation within the control valve.
- the construction described has significant advantages over the known constructions however, in particularly severe operating conditions there may be some ice formation in the exhaust control valves.
- the formation of ice can be minimised by introducing air into the valve chamber. This air can be obtained from the supply and may or may not be heated. It will be understood that the supply of such air is to be avoided if possible since it represents an energy loss.
- the main valve deals with the admission of air to the opposite ends of the cylinder and also the exhaust of air therefrom.
- the air is exhausted into the space within the cover and is a source of considerable noise.
- the air contains fine droplets of oil in order to provide for lubrication of the various parts, the oil is deposited in the vicinity of the valve and tends to be carried out and deposited on the floor around the motor and pump.
- the exhaust air is conveyed away and there is a considerable reduction in the noise generated and furthermore there is no deposition of oil in the vicinity of the motor.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Description
Claims (7)
- An air motor comprising a cylinder (10), a piston (14) movable within the cylinder (10), a piston rod (13) coupled to the piston (14) and extending from the cylinder (10), a control valve (16) which controls the admission of compressed air to the opposite ends of the cylinder (10) in turn, an actuating mechanism (17) for the valve (16), said actuating mechanism (17) acting to alter the setting of the control valve (16) whereby as the piston (14) attains a predetermined position as it approaches one end of the cylinder (10), the control valve (16) will operate to admit compressed air to the one end of the cylinder (10) to achieve reverse motion of the piston (14) and vice versa, a pair of exhaust conduits (31, 35) communicating with the opposite ends of the cylinder (10), a pair of exhaust control valves (28, 33) for controlling the flow of air through said exhaust conduits (31, 35) respectively, and said exhaust control valves (28, 33) being responsive to the setting of said first mentioned control valve (16), the air motor being characterized in that each of said exhaust conduits (31, 35) is constructed so that as the exhaust air flows therethrough a substantial proportion of the air expansion takes place in a heat exchanger (38,39) of the conduit (31, 35) removed from the respective exhaust control valve (28, 33), said heat exchanger being configured to transfer ambient heat to the air expanding in said part of said conduit.
- An air motor according to Claim 1, characterized in that each exhaust conduit (31, 35) has an initial portion (37) through which the exhaust air flows as it leaves the respective exhaust control valve, of reduced cross sectional area as compared with the remaining portion (38) of the exhaust conduit.
- An air motor according to Claim 1, characterized in that said initial portion of the conduit is defined by a plurality of passages (37).
- An air motor according to any one of Claims 1 to 3, characterized in that said heat exchanger (38,39) of each exhaust conduit is provided with a plurality of fins (39) to assist heat exchange between the ambient atmosphere and the wall of the conduit.
- An air motor according to Claim 4, characterized in that the exhaust conduits and fins are machined from solid material.
- An air motor according to any one of the preceding claims, characterized in that said exhaust control valves are diaphragm valves.
- An air motor according to any one of the preceding claims, characterized in that said first mentioned control valve (16) and one of said exhaust control valves (28) are mounted on an upper end wall of the cylinder within a cover (50) extending downwardly around the cylinder (10), the exhaust conduit (31) associated with said one exhaust control valve (28) passing through the cover (50), at least said portion (38) of the conduit being exterior of the cover (50).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9315736 | 1993-07-29 | ||
GB939315736A GB9315736D0 (en) | 1993-07-29 | 1993-07-29 | Motor |
PCT/GB1994/001624 WO1995004208A1 (en) | 1993-07-29 | 1994-07-28 | Air motor with means to prevent freezing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0666961A1 EP0666961A1 (en) | 1995-08-16 |
EP0666961B1 true EP0666961B1 (en) | 1999-04-14 |
Family
ID=10739651
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94921742A Expired - Lifetime EP0666961B1 (en) | 1993-07-29 | 1994-07-28 | Air motor with means to prevent freezing |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0666961B1 (en) |
AU (1) | AU7234494A (en) |
DE (1) | DE69417867T2 (en) |
GB (1) | GB9315736D0 (en) |
WO (1) | WO1995004208A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009544897A (en) | 2006-07-26 | 2009-12-17 | グラコ ミネソタ インコーポレーテッド | Pneumatic motor exhaust system with ice resistance and low noise |
CN103233778B (en) * | 2013-04-22 | 2016-02-10 | 安徽农业大学 | A kind of ecp motor through piston type air compressor transformation |
CN115288799A (en) * | 2018-01-15 | 2022-11-04 | 固瑞克明尼苏达有限公司 | Compressed air driven motor |
CN111396136A (en) * | 2020-04-20 | 2020-07-10 | 中国船舶重工集团长江科技有限公司 | Pneumatic motor with dead-point-free exhaust reversing mechanism |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3635125A (en) * | 1969-03-21 | 1972-01-18 | Nordson Corp | Double-acting hydraulic pump and air motor therefor |
US3675732A (en) * | 1971-05-17 | 1972-07-11 | Nordson Corp | Muffler for pneumatic motor |
JPH02245401A (en) * | 1989-03-17 | 1990-10-01 | Nippon Gurei Kk | Antifreezing device for air motor |
-
1993
- 1993-07-29 GB GB939315736A patent/GB9315736D0/en active Pending
-
1994
- 1994-07-28 DE DE69417867T patent/DE69417867T2/en not_active Expired - Fee Related
- 1994-07-28 EP EP94921742A patent/EP0666961B1/en not_active Expired - Lifetime
- 1994-07-28 AU AU72344/94A patent/AU7234494A/en not_active Abandoned
- 1994-07-28 WO PCT/GB1994/001624 patent/WO1995004208A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP0666961A1 (en) | 1995-08-16 |
DE69417867T2 (en) | 1999-10-14 |
DE69417867D1 (en) | 1999-05-20 |
GB9315736D0 (en) | 1993-09-15 |
WO1995004208A1 (en) | 1995-02-09 |
AU7234494A (en) | 1995-02-28 |
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