FR2547362A1 - MONOCYLINDRICAL OR MULTICYLINDRICAL RADIAL PUMP - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS A SINGLE OR MULTI-CYLINDRICAL RADIAL PUMP INCLUDING A BODY 1 IN WHICH IS ROTATED A SHAFT 2 CARRYING AT LEAST ONE ECCENTRIC OR A CONTROL CAM 3, AT LEAST A PISTON 13 SLIDING UP WITH RESPECT TO BODY 1 AND SUBJECT TO THE ACTION OF ELASTIC MEANS 14 TENDING TO APPLY IT TO THE ECCENTRIC, AND A DISCHARGE DEVICE INCLUDING A VALVE SEAT 18, A VALVE 21 REQUESTED TO ITS SEAT BY ELASTIC MEANS 26, A VALVE CAGE 24 AND AN OUTLET PLUG-FITTING 30. ACCORDING TO THE INVENTION THE PISTON 13 IS SLIDING FITTED IN A FACTORY BORE 12 DIRECTLY IN THE PUMP BODY 1, AND THIS BORE 12 IS EXTENDED BY A SECOND BORE 16 OF LARGER DIAMETER IN WHICH IS PLACED. THE DISCHARGE DEVICE, THIS BEING HELD IN POSITION AGAINST THE ELASTIC MEANS BY THE CONNECTION PLUG 30 WHICH IS TIGHTLY FIXED IN THIS SECOND BORE 16.

Description

Single or multi-cylinder radial pump.

  The present invention relates to a radial pump comprising a body in which is mounted rotatably a shaft carrying at least one eccentric or a control cam, at least one piston slidably mounted relative to the body and subjected to the action of elastic means tending to apply it on the eccentric, and a delivery device comprising a valve seat, a valve biased towards its seat by elastic means, a cage

  valve and an outlet plug-fitting.

  It relates to a pump of this type in which it is easy to replace the defective parts and which, when it is multicylindrical, can easily be adapted to the needs of use, which allows to manufacture it in large series, to

a reduced cost price.

  The pump according to the invention is characterized in that the udder is slidably mounted in a bore machined directly into the pump body, and in that this bore is extended by a second bore of larger diameter in which is disposed

  the delivery device, the latter being held in positior against the elastic means by the plug-fitting which is sealed in this second bore.

  In the case of a multicylindrical pump, the pump body comprises a series of holes in each of which can be mounted a piston, elastic return means and a discharge device, and each of the common discharge devices that, downstream of the valve, with a conduit opening into a chaml common to all the delivery devices In these cor ditions, it is possible to replace the plugs-fittings, except for one, by simple plugs The different er sebles The cylinder-piston works in parallel and delivers the liquid to the remaining connections. It is also possible, if desired, to remove bores with a simple plug from the piston, its return means and the corresponding delivery device. Non-limiting examples of embodiments of the pump according to the invention are described below with reference to the accompanying drawings in which: FIG. 1 is an axial sectional view of a pump single cylinder; Figure 2 shows the discharge valve of the pump seen from below; Figure 3 is a plan view of the valve cage; Figure 4 is an elevation view, partly in section,

a multicylindrical pump.

  As it is shown in Figures 1 to 3, the pump according to the invention comprises a body 1 in which is rotatably mounted a shaft 2 carrying an eccentric 3 on which are mounted a ring 4 and a wear ring 5 held by two washers 6. The shaft 2 rests in two plain bearings 7 and 8 mounted one

  directly in the body 1, the other in a ring 9 forming a spacer.

  In the chamber 10 surrounding the eccentric 3 open on the one hand an intake duct 11 and on the other hand a radial bore 12 which is arranged opposite the eccentric and in which is slidably mounted a piston 13 This piston is constituted by a blind tube whose closed face is held in abutment against the eccentric 3 by a spring 14 Its cylindrical face has holes 15 uncovered or not depending on the position of the piston and pro20 pres close to the chamber 10 in communication with the inside the piston. The bore 12 is extended by a bore 16 of greater diameter to which it is connected by a shoulder 17 and which forms

  housing for the delivery device of the pump.

  This delivery device comprises a valve seat 18, made of sintered steel, which bears on the shoulder 17 and serves as a stop for the spring 14. This seat has a diameter smaller than that of the bore 16 so that an annular chamber 19 is formed around the seat It has a central bore 20 which can be closed by a valve 21 and lateral grooves 22 connecting the discharge

  from the pump to the annular chamber 19.

  The valve 21 is movable inside a chamber 23 formed in a valve cage 24 made of sintered steel. The latter comprises a central bore 25 which extends the chamber 23 and may be blind, but is open in the example of illustrated embodiment; this bore contains a spring 26 tending to apply the valve 21 to its seat 18 and has a smaller diameter than the chamber 23 to which it is connected by a shoulder 32 The cage

  Valve 24 has lower grooves 27, lateral 28 and upper 40 29.

  The valve seat 18 and the valve cage 24 are maintained

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  in the bore 16 by a plug-fitting 30 which is screwed into the body 1 and on which the spring 26 bears. This plug has an outlet bore 31 and is extended at its part facing the discharge device by a blind ring 30 a whose inner diameter is adjusted to hold the seat 18 and its cage 24 in place while its outside diameter is adjusted to crush an O-ring 33 which ensures

  the sealing of the discharge To facilitate the assembly and disassembly of the discharge assembly, prints can be printed to the ring 30a, so that the plug 30, the valve cage 24, the valve seat 18 , the valve 21 and the spring 26 constitute a modular assembly.

  In operation, the liquid in the chamber 10 passes inside the piston 13 through its holes 15, when the piston is in the down position. When the piston is then pushed back by the eccentric 3, the liquid is trapped at the interior of the piston and discharged by the latter It pushes the valve 21, which is applied on the shoulder 30a by closing the

  25, and flows to the outlet bore 31 by the grooves 27, 28 and 29.

  FIG. 4 shows another embodiment in which the pump is multicylindrical. In this case, the body 1 comprises several radial bores 12 in each of which is slidably mounted a piston 13 and each of which is associated with a delivery device 25 maintained by a plug-fitting 30 with its blind ring 30 But the body has ducts 34 which put the chambers 19 in communication with the same annular chamber 35 coaxial with the shaft 2 The different pump backs are also interconnected In this case it is possible to replace one or more plugs 30 with a plug

  which closes the bore 16, possibly leaving in place the pistons 13, the seats 18 and the cages 24; the different pump discharges work in parallel and pump the liquid into the remaining connections.

  It goes without saying that the present invention should not be considered as limited to the two embodiments described and

  represented, but covers, on the contrary, all variants.

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Claims (5)

  1 radial pump mono or multicylindrical comprising a body 1 in which is rotatably mounted a shaft 2 carrying at least one eccentric or a control cam 3, at least one piston 13 slidably mounted relative to the body 1 and subject to ac5 tion elastic means 14 tending to apply to the eccentric, and a discharge device comprising a valve seat 18, a valve 21 biased towards its seat by elastic means 26, a valve cage 24 and a plug-fitting of outlet 30, characterized in that the piston 13 is mounted grouting 10 in a bore 12 machined directly into the pump body   1, and in that this bore 12 is extended by a second bore 16 of larger diameter in which the delivery device is arranged, the latter being held in position against the elastic means by the connecting plug 30 which is sealed in this second bore 16.   2 pump according to claim 1, characterized in that the valve cage 24 comprises a central bead 25, open or blind, provided with an inner shoulder 32 and ensuring the centering of the   valve 21 and its return spring 26.   3 pump according to one of the preceding claims, characterized in that the valve cage 24 has grooves of   passage 27, 28 and 29 respectively on its lower surface, on   its lateral surface and on its upper surface.   4 Pump according to one of the preceding claims, carac25 terérised in that the valve seat 18 has lateral grooves 22.   Pump according to any one of the preceding claims, characterized in that the plug-fitting 30 is extended to   its portion facing the discharge device by a blind ring 30 has sealing 30 and now in place the seat 18 and his cage 24.