US1944648A - Pump - Google Patents

Description

L. SAUSSARD 1,944,648

PUMP

Filed April 5, 1932 4 Sheets-Sheet 2 Jan. 23, 1934.

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PUMP

Filed April 5, 1932 4 Shetzs-Sheet 3 M VeNTmQ M 3 w 0 i. E S 3 Q on we ww om 3 Hmflm HHMMH U U .fi.... m aw 3 Q em 5m Jan. 23, 1934. SAUSSARD 1,944,648

PUMP

Filed April 5, 1932 4 Sheets-Sheet 4 w v 7 w w.

IIIIII/III 4 N LID Patented Jan. 23, 1934 PATENT OFFICE PUMP Louis Saussard, Paris, France, assignor to Societe Anonyme Pour Tons Appareillages Mecaniques, Levallois Perret, France Application April 5, 1932, Serial No. 603,387, and in France April 10, 1931 9 Claims.

Such pumps are of the volumetric type, and it Y is necessary, in order to avoid accidental overpressures upon'delivery, to provide them with safety devices so arranged as to automatically connect the delivery conduit to the suction conduit when these overpressures reach a definite value.

For that purpose, use is generally made of a by-pass provided with a loaded valve and connected in parallel with the pump between the inlet and delivery conduits.

The pump, according to the invention, has a device for putting it out of action and mounted within the latter. This device is mainly characterized by the fact that one of the plates on which slide the side faces of the inner and intermediate pistons is movable parallel to the axis of the pump. Suitably arranged conduits cause the same pressure to exist behind this plate than upon suction, and a suitable returning device holds it in position during normal working.

If the pressure, upon delivery, exceeds a definite value, the above plate moves by tensioning its returning device and automatically puts the pump out of action by causing the various com- .partments of the frames to communicate with each other.

Other features of the invention, allowing in particular to use the above movable plate for causing the pump to cooperate with an emergency pump adapted to replace it in case of damage, will be described hereinafter.

The accompanying drawings illustrate, by way of example only, various forms of carrying out the subject-matter of the invention.

Figs. 1, 2 ilustrate a first form of construction.

Fig. 1 is a longitudinal section thereof.

Fig. 2 is a section thereof perpendicular to the axis.

Figs. 3-4 and 5-6 are similar views of a second and of a third form of construction, respectively.

Fig. '7 is a diagram showing the combination of the pump according to Figs. 5 and 6 with an auxiliary or safety pump.

The pump illustrated in Figs. 1 and 2 is adapted to provide very high pressures and to support high stresses.

For that purpose, the eccentric 1a of the shaft N (01. 10342) This invention has for its object improvements 1 which drives the inner piston 2 is of relatively great length; the piston 2 is provided with two side extensions 2a which cover all this length.

The members 1a, 2, are thus in contact through large surfaces, and the first one can transmit to the second one high stresses without causing excessive strains or rendering the lubrication more difficult. 1

The extensions 2a of the piston .2 extend in eccentric bores of rings 4, 5 mounted on the shaft 1 and driven by the movement of rotation of the latter through the medium of keys 6.

The outer faces of these rings are turned concentric with the shaft, and are journalled respectively in the casing 7 and in a sleeve 8 which can slide longitudinally without rotating relatively to this casing. The movement of this sleeve is guided by a claw 9, the head of which fits into a groove 10 provided in the outer face of the sleeve.

The face of the sleeve 8 which is opposite the inner piston 2 presses a perfectly plane plate 15 on the corresponding side faces of this piston, of the intermediate piston 11 and of the outer frame 12 so as to provide a fluid-tight joint.

As the sleeve 8, this plate can slidelongitudinally on the ring 5.

A housing 13a, provided between the plate 13 and the casing, allows this sliding movement.

The opposite end of the sleeve 8 carries an abutment 14 arranged in a chamber 15 of the casing, in which chamber opens the delivery conduit 16 of the pump.

In this chamber is moreover mounted a'case 1'7 having waved side walls, similar to those used in aneroid barometers.

During normal working, the side walls of this case are held at a constant distance apart by a suitable inner balancing device; when the pressure, upon delivery, increases, these side walls move towards each other.

One of the side faces of the said case is secured to the end of the abutment 14; the other face is normally held stationary by a fixed abutment 18, and the case 1'7 exerts on the sleeve 8 and on the plate 13 a definite pressure. This pressure can moreover be adjusted by means of a sleeve 19 screwed on the end of the casing 7, and rigid with a bolt 20 which is screwed in the end of abutment 18.

The screw-threads of the sleeve 19 and of the bolt 20 are of reverse pitches and have slightly different values, so that the manipulation of the sleeve causes very slight longitudinal displacements of the abutment 18, and that it is possible 110 to effect the adjustment with the required accuracy.

During normal working, the tension of the case 17 holds the plate 13 in the position illustrated.

If the pressure, upon delivery, increases, it causes the flattening of the case 17, and a displacement of the sleeve 8 towards the left.

This displacement establishes between the sleeve 8 and the plate 13 a communication between the chamber 13a and the suction conduit 21 of the pump, by means of passage-ways such as 22, 23 provided in the casing 7 and in the outer frame 12; owing to this arrangement, the plate 13 can move freely towards the left under the action of the overpressure and puts the pump out of action.

This putting out of action can be further facilitated, by providing holes in the plate 13, at

such places that they do not prevent the normal operation of the pump, and through which" holes the liquid delivered by the movable frames can issue freely.

At the place where the shaft 1 passes through the pump casing is arranged a stufling-box which can be adjustably tightened; this stufling-box has a plastic packing 24 arranged in a recess of the casing 7 and clamped against the bottom of this recess by a ring 25 sliding on the shaft and held by a nut 26 screwed on the casing 7.

This nut carries a finger 27 which extends into a longitudinal groove 28 provided in a control cap 29 pivotally mounted on the casing 7.

The above apparatus is more particularly adapted to be used in plants having a vertical driving shaft 1.

In this case, the upper edge of the cap 29 is provided with a cup adapted to receive the lubricating oil from the upper bearing of the shaft.

The form of construction illustrated in Figs. 3 and 4 also comprises a movable plate 13. In this form of construction this plate is held in position, during normal working, by a returning spring 31 compressed between the said plate and the pump casing.

As in the first form of construction, an empty space 13a allows it to move longitudinally under the action of an overpressure.

This space 13a is put in communication with the suction conduit through a passage 3233 provided with a suitably loaded valve 34 which opens towards the suction side.

In case of overpressure. upon delivery, the plate 13 slides towards the right in Fig. 3.

overpressure in chamber 13a is avoided by the opening of the valve 34, so that the plate 13 can freely move and put the pump out of action.

The pump illustrated in Figs. 5 and 6 also comprises, on the suction side 21, a plate 13 arranged in a similar manner to that above described.

Moreover, the plate 35, arranged on the other side of the pistons 2, 11, can also move longitudinally in a housing 35a communicating with the delivery conduit 37 through passages 38. This plate 35 is normally held in position by a returning spring 39.

The said plate 35 is moreover provided with oriflces 40 formed at the level of the fixed frame 12, and covered by this frame when the plate is in the position illustrated.

This pump is adapted to cooperate with an emergency pump 52 (Fig. 7), connected to the delivery conduit 37.

When the pump operates normally, the plate 35 is held in position by the delivery pressure and by its returning spring 39, and fits in a fluid-tight manner against the members with which it cooperates.

If, on the other hand, the main pump is stopped, and the emergency pump is in use, the latter causes a suction at 37, and moves the plate 35 and compresses the spring 39.

The main pump is then put out of action, and the liquid directly passes, through the orifices 40, chamber 35a and passage-ways 39, into the conduit 3'7 and into the auxiliary pump.

The plate 35 then acts as a suction valve.

The pump 52 can be mounted in series upon' the conduit 37, if it is so adapted as to allow the free passage of the fluid delivered by the main pump in motion even when the said pump 52 is stopped; or it is mounted, as shown in Fig. 7, in derivation upon the conduit 37,-"-a'non-return valve 53 .,loeing then'disposed in the said conduit between the suction pipe 54 and the delivery pipe 55 of the pump 52; in this case, the fluid delivered by the main pump in motion passes through the check valve 53 when the pump 52 is stopped; when, on the contrary, the main pump is stopped and the pump 52 set in motion, the latter sucks the fluid through the main pump and delivers the same at 55 into the delivery conduit, the check valve 53 remaining closed.

If the main pump is arranged approximately at the level of the tank containing the liquid to be pumped-this plate also constitutes a foot valve.

The form of construction illustrated in Figs. 5 and 6 comprises moreover an air compressor of the same kind as the main pump, that is to say constituted by pistons 41, 42 in the shape of frames sliding in each other, the piston 41 being moved in the piston 42 by means of an eccentric 43 rigid with a hollow shaft 44, and the piston 42 sliding in a fixed body or frame 45.

The shaft 44 is arranged in alignment with the shaft 1 of the pump and is coupled with it, on the side of the delivery chamber 15 of the said pump, by a cross pin 46, in an easily removable action of a spring 49. In this partition are provided the air suction orifices 50 of the compressor, which orifices open into a chamber 51 surrounding the shaft 44.

It results therefrom that the small quantity of liquid which might pass from the delivery chamber 15 about the shaft 44 would enter the chamber 51 and would be sucked with the air by the compressor. This arrangement is particularly suitable in gasoline dispensing apparatus in which the air compressed by the compressor is led into a gasoline tank.

It is to be understood that the various forms of construction described above by way of example can be modified as far as their details and essential arrangements are concerned without departing thereby from the scope of the present invention.

For instance, this pump can be devised in such a manner that the distortion of the returning device urging the movable plate or plates such as 13 owing to an overpressure upon delivery, may have the effect, not of allowing the displacement of this plate owing to the difference of the pressure respectively exerted on each of its faces, but of determining this displacement.

In a pump of the type illustrated in Figs. 1, 2, for instance, such a device can be very easily providedb utilifing, between the sleeve 8 and the plate 13, such a connection that the sleeve 8 drives the plate with it during its sliding movement towards the left of Fig. 1, and by providing conduits suitably arranged for avoiding a back-pressure behind this plate, in the chamber 13a.

A device of this type can of course also be employed for controlling a plate such as 35.

I claim:

1.- A pump comprising a shaft carrying an eccentric and provided with inlet, distributing and delivery conduits, an inner frame mounted on the eccentric of this shaft, an outer frame slidably mounted on this inner frame, the said frames having inlet and exhaust conduits provided in their walls, two side plate members between which the frames slide, one at least of these plate mem I bers being adapted to slide parallel to the axis 'bf' the shaft, a manometricdevice interposed between a bearing member and the plate member, and adapted to press this cheek member aga'mst the corresponding side faces of the frames, to be subjected to the delivery pressure of the pump, and to become distorted and allow the plate member to move away from the frames when the said pressure reaches a definite maximum.

2. A pump comprising a shaft carrying an eccentric and provided with inlet, distributing and delivery conduits, an inner frame mounted on the eccentric of this shaft, an outer frame slidably mounted on this inner frame, the said frames having inlet and exhaust conduits provided in their walls, two side plate members between which the frames slide, one at least of these plate members being adapted to slide parallel to the axis of the shaft, a manometric device, connecting means between this manometric device and the plate member, the said manometric device being adapted to press this cheek member against the corresponding side faces of the frames, to be subjected to the delivery pressure of the pump and to become distorted and move the plate member away from the frames when the said pressure reaches a definite maximum.

3. A pump comprising a stationary casing having suction and delivery conduits, a shaft carrying an eccentric, pumping elements moved in the said casing by the said shaft in a plane which is perpendicular to its axis, two side walls between which said pumping elements slide, one of these walls being axially movable in the easing, resilient means adapted to press the said movable wall against one side of the said pumping elements, the chamber situated within the easing outside the said movable wall being in com munication with the suction conduit of the casing, so that the fluid contained in the said chamber may always pass to the suction itself even when the said wall bears against the pumping elements.

4. A pump comprising a stationary casing, having suction and delivery conduits, a shaft carrying an eccentric, pumping elements moved in the said casing by the said shaft in a plane which is perpendicular to its axis, two side walls between which said pumping elements slide, one of these walls being axially movable in the casing, resilient means adapted to press the said movable wall against one side of the said pumping elements, a conduit connecting the said suction conduit with the chamber situated within the casing outside the said movable wall, and a check valve disposed in the said connecting conduit, adapted to allow the fluid contained in the said chamber to pass from the latter into the suction conduit.

5. A pump comprising a shaft carrying an eccentric having inlet, distributing and delivery conduits provided therein, an inner frame mounted on the eccentric of this shaft, an outer frame slidably mounted on this inner frame, a casing in which the said outer frame slides, the said frames having inlet and outlet conduits provided in their walls, two side walls between which the said frames slide, one at least of these walls being adapted to slide axially in a chamber of the casing, a resilient element adapted to press the said movable wall against the said frames and connecting means between this chamber and the suction of the pump, these means being adapted to allow the contentswof the saidchamber vtoalwaysfreely flow toward the suction even when the said movable wall-bears against the said frames.

6. A pump comprising a shaft carrying an eccentric having inlet, distributing and delivery conduits provided therein, an inner frame mounted on the eccentric of this shaft, an outer frame slidably mounted on this inner frame, a casing in which the said outer frame slides, the said frames having inlet and exhaust conduits provided in their walls, two side walls between which the said frames slide, one at least of these walls being adapted to slide axially in a chamber of the casing, a resilient element adapted to press the said movable wall against the said frames, a conduit adapted to cause this chamber to communicate with the suction of the pump and, in this conduit, a check valve opening to the suction of the pump.

7. A pump comprising a shaft carrying an eccentric having inlet, distributing and delivery conduits provided therein, an inner frame mounted on the eccentric of this shaft, an outer 118 frame slidably mounted on this inner frame, a casing in which the said outer frame slides, the said frames having inlet and exhaust conduits provided in their walls, two side walls between which the said frames slide, one at least of 120 these side walls being adapted to slide axially in a chamber of the casing, a resilient element adapted to press the said movable wall against the said frames, the said inner frame having side tubular extensions which surround the eccentric of the shaft, rotary bearings surrounding the shaft and the said tubular extensions, and sleeves surrounding the said bearings, the inner and outer surfaces of the said extensions being so adjusted as to be in contact respectively with the periphery of the eccentric and with the inner surface of the bearings.

8. A pump comprising a stationary casing having suction and delivery conduits, a shaft carrying an eccentric, pumping elements moved in this casing by the said shaft in a plane perpendicular to its axis, two walls axially movable in the casing, resilient means adapted to press the said movable walls against the opposite sides of the said pumping elements, the chambers re- 11.! maining within the casing outside the said movable walls communicating respectively with the suction and the delivery.

9. The combination of a main pump comprising a stationary casing having suction and delivery conduits, pumping elements sliding in this stationary casing, two walls in this casing between which the said pumping elements slide and which are adapted so as to be able to move slightly apart from the said elements, resilient 2 means adapted to press the said walls against the said elements, the spaces in the casing outside the said walls and in which said walls can be pushed back from said elements communicat- 5 ing respectively with the suction and delivery conduits, and an auxiliary pump the suction side of which is connected to the delivery side of the the latter is stopped.

LOUIS SAUSSARD.

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