FR2668556A1 - PRESSURE CHAMBER BODY AND MOTOR PUMP GROUP USING SUCH BODY. - Google Patents

Abstract

The casing of a pressurised chamber comprises an integrally cast rotor shell centred on the rotor and having an inlet connection, at least one peripheral outlet connection and one open face designed to be sealed by a peripheral edge resting on a support casing. It comprises an outer shell 17, designed to rest axially by means of a central annular section 40 surrounding the inlet connection 18 on the annular outer face 43 of the rotor shell 15 and a front bearing section is fitted with at least two legs or bearings 51, 52 intended to permit the fixing of the outer shell 17 on the support casing 7a by means of fixing elements 55, 56. Application on pump casings of plastic or composite material affording excellent corrosion and abrasion resistance but more limited mechanical strength.

Description

PRESSURE CHAMBER BODY AND MOTOR PUMP GROUP

USING SUCH BODY

  The present invention relates to a pressure chamber body, in particular to a pump body consisting of a monobloc rotor casing, generally annular in shape centered on the rotor and having: an inlet connection opening at center of an annular outer face, at least one peripheral outlet connection and an open face intended to be closed by the support of a peripheral rim on a support body. It also concerns the pump units

using such pump bodies.

  While medium and high power pumps still use conventional and resistant materials such as steel, cast iron, bronze, for rotor and stator parts, low power pumps are becoming more and more common. in domestic life, use

  already largely synthetic materials such as

  plastics used, for example, to

  washing machines operating under low pressure.

  On the other hand, for the higher pressures and longer operating times corresponding, for example, to the central heating circulators, it has not been possible until now to produce pump casings of this type made of plastic or plastic material. Composite replacing the bronze or cast iron used until now In addition to the problems of resistance to pressure, there are, in fact, problems of cantilever mounting of the pump unit which is located

  actually attached to a rigid support by the pump body.

  The present invention aims at making it possible to produce pressurized chamber bodies such as pump bodies made of plastics material or composite material (reinforced with fibers) which is highly resistant to corrosion and, where appropriate, to abrasion, and much less expensive to achieve than traditional foundry materials and that can withstand not only the pressure forces but also the mechanical efforts of fixing a pump set on a

  rigid support and the stresses caused by the connections

  from the pump to the fluid circuits served.

  For this purpose, according to the invention, the pressurized chamber body comprises an outer one-piece outer casing more resistant and rigid than the rotor casing and adapted to bear axially, by a central annular portion.

  surrounding the inlet connection, on the outside

  of the rotor casing and at least partially surrounding the periphery of the rotor casing, excluding the peripheral output connection or connections, by a connecting portion connecting a front support portion and the central annular portion and said front support portion

  is equipped with at least two legs or supports intended to

  the fastening of said outer casing to said support body by fixing members such as screws by applying the rotor casing in a sealed manner, by its

  peripheral rim, on the support body.

  In order to obtain a better transmission of the pressing force exerted by the outer casing on the rotor casing, the lugs or supports are each associated with bearing surfaces of the outer casing on a flexible carrying surface. outside the peripheral rim of

the rotor envelope.

  According to another embodiment of the invention, the connecting part of the one-piece outer casing projects at least two front fixing bosses of said outer casing on an outer support. Each fixing boss comprises a bore substantially parallel to the outer casing. rotor shaft and adapted to receive a fastening rod such as

bolt or screw.

  The charge of the whole of a pump unit can thus be transmitted to an external support directly by the portion of the outer casing which provides the connection between the central annular portion of the outer casing and the support body formed in general. by the envelope of a

  electric motor much heavier than the pump itself.

  The connecting portion advantageously has a bell shape whose flared central portion is traversed by at least one cut open on the front support edge and allowing the passage of a peripheral outlet fitting of

the rotor envelope.

  According to another embodiment of the pressure chamber according to the invention, the central annular portion is traversed by the inlet fitting which it surrounds by an open sleeve portion which ends on the outside with a flange adapted to resting on the outer edge of said inlet fitting, leaving free the passage of a connecting pipe to the inlet fitting The flange projects slightly inwardly of an outlet bore formed in the inlet fitting, in order to retain axially in position a joint

  annular sealing ring disposed in said outlet bore.

  According to yet another embodiment of the invention,

  the one-piece rotor casing is made of a mat-

  flexible and resistant to corrosion by the vehicle liquid

  driven by the pump, for example of plastic or composite material based on fibers, and cooperates with a pump rotor centered and guided on the inner outlet of the inlet connection and the rotor casing is devoid of any means of fixation or fixing accessory such as tab and drilling but has an open outer face of flange adapted to cooperate sealingly with a fixing ring

  of the drive motor casing.

  According to yet another embodiment of the invention,

  the outer casing is made in one piece by molding in a metal such as an aluminum alloy capable of receiving

self-tapping screws.

  In a pump unit comprising a rotor pump unit mounted cantilevered on the shaft of an electric drive motor and an electric motor unit consisting of a rotor tube sealingly enclosing the rotor and its bearings and 'a stator housed in an engine casing, the

  pump rotor mounted on the motor rotor is housed within the

  of a pressure chamber body according to the embodiments which have just been described and whose one-piece outer casing is fixed rigidly to a crown of

  the engine casing by sealing the container

  rotor lug on the engine casing so as to delimit

  a pressure chamber containing the pump rotor and

inside the rotor tube.

  Other purposes, advantages and features appear

  when reading the description of an embodiment

  of the invention, made without limitation and with reference to the accompanying drawing in which: Figure 1 shows a longitudinal section along the axis of the pump rotor and motor, a pump unit for heating circulator comprising a pump body

  realized according to the invention, the connections

  mechanical and fluid elements of this group being shown in fragmentary views; Figure 2 shows an end view of the open side of the outer casing of the pump body; Figure 3 shows the section along the plane III-III of Figure 2; FIG. 4 represents the section along the IV-IV planes

of Figure 2.

  FIG. 1 shows a complete pump unit forming a heating circulator. The pump rotor 1 provided with centrifugal fins 1a is fixed in rotation and in axial position (by claws) at the end of a pump shaft. rotor 2 which carries the rotor 3 of the electric drive motor 4 of the pump This electric motor 4 comprises a stator 5 which is sealingly insulated from the rotor 3 by a non-magnetic and non-magnetic metal air gap tube 6 and which is surrounded by a rigid metal casing 7 surmounted by a terminal box 8 and forming a motor casing The casing 7 has, on the side of the pump rotor, a ring 7 open on the electric motor and sealingly closed on the stator 5 until to the air gap tube 6 (through the O-ring 10) by a sheet metal flange 9 which engages at its periphery in a centering bore 7b of the ring 7a and which carries a friction bearing 11 ensuring at the same time the

  axial guidance of the rotor shaft 2.

  The pump rotor 1 is housed in a pump body 12 intended to form the pump volute and with which it cooperates to generate an overpressure on the fluid normally aspirated by a suction pipe 13 and discharged by a pump.

  discharge pipe 14 The pump casing 12 is

  killed, according to the invention, by assembling two one-piece parts: on the one hand, a rotor casing 15 of generally annular shape and centered on the rotor 1 by an inner sleeve 16 and, on the other hand, an envelope outer 17 more resistant and stiffer than the envelope 15 and realized

  here cast metal alloy, especially aluminum alloy

  minium. The rotor casing 15 is provided, in the axis, with a connection 18 for entering the fluid to be pumped. This connection 18 is formed by a bore 18 formed inside a sleeve 19 that protrudes. at the center of the annular outer face of the rotor casing The bore 18a is extended outwards by a bore of larger diameter 18b

  intended to serve as a seat for a sealing O-ring

  20 and, inwardly, by the inner sleeve 16 which

  is housed in the inlet bore 21 of the rotor 1 to the

centrifugal fins.

  A substantially cylindrical ring-shaped portion 22

  the rotor casing 15 is directed towards the metal casing

  7 surrounding the rotor 1 and ends with an open face 23 (see Figures 3 and 4) which bears on respective bearing faces 24 and 25 of the flange 9 and the carcass 7, the seal being assured between face 24 and

  the flange 9 by interposition of an annular seal

  In fact, the open face 23 terminates in a short sleeve section 26 which engages inside the centering bore 7b formed in the carcass 7 and which terminates in a front face provided with support. The sleeve portion 26 extends outwardly by a bearing shoulder 27 on the face 25 of the carcass 7 which corresponds to a flange 28 projecting from a weakened surface.

  height outside the substantially cylindrical ring 22.

  The face of the rim 28 facing the opposite side to the

  green 23 is here inclined to provide a surface of por-

  stage 29 whose function will be described later.

  The rotor casing 15 has outlet connections

  of fluid opening on its periphery A connection of

  30, closed in use by a threaded plug, is provided at the bottom of the substantially cylindrical portion 22 A connection of

  31 is provided at the top of the compartment.

  22 and comprises a lateral orifice 32 forming a tangential start of a pump volute 33 delimited by an annular rib 34 projecting internally and a sleeve connection 31a provided with a cylindrical bore 35 for sealing the discharge pipe 14 equipped, if necessary, with a seal

O-ring 36.

  The outer shell 17 has a complementary shape

  to that of the rotor casing 15, centered on the opening

  aspiration 18 a, 16 and showing a part of

  sleeve 38 which surrounds the sleeve 19 and ends with a

  edge 39 which protrudes slightly beyond the bore 18b of the sleeve 19 to axially retain the O-ring 20, without

  however, come into contact with the suction pipe 13.

  The envelope 17 continues after the sleeve 38 by a central annular portion 40 which is provided with external ribs 41 and adapted to bear axially, directly or as shown, via an inner annular rib 40a, on the convex central reach 42 of the face

  outer ring 43, here partially O-ring, of the

rotor wheel 15.

  The annular portion 40 continues here with a connecting surface 44, partially toric, by a connecting portion 45 in the general shape of a cylindrical ring surrounding the substantially cylindrical ring 22 of the rotor casing 15. This portion 45 has cutouts for leave out the outlet connections of the casing 15 A cutout 37 (see FIG. 4) allows the drain connector to project outwardly 30 To accommodate the discharge connection 31, a wider cutout 46 is provided ( see Figures 2 and 3) and between the cutouts 37 and 46, the connecting portion 45 of generally cylindrical shape, is shaped in two substantially semicylindrical portions 45a and 45b (see the two parts shown in Figure 4) which is terminate frontally by two flanges 47 and 48 constituting a front support portion The flanges 47 and 48 respectively comprise an inner bearing 49 and 50 forming a

  bearing surface intended to cooperate with the wear surface

  ge 29 formed on the flange 28 of the rotor casing 15 In two diametrically opposite zones on each of the flanges 47 and 48 is provided, integral with the flanges, a respective lug or support 51, 52 provided with fixing means on the carcass rigid metal 7 of the support body motor The fastening means are constituted here by a hole or bore 53, 54 for the passage of a fixing screw 55, 56 on corresponding lugs 57, 58 of the casing 7 of the motor, to with the help of nuts 59, 60 Bores 53, 54 can be replaced by tapped holes directly receiving a fixing screw whose head is arranged on the motor side

electric 4.

  Each of the two parts is substantially hemicylindri

  45 a, 45 b of the connecting portion 45 comprises at least one cylindrical fixing boss 61, 62, 63 (see the three bosses in Figure 2) integrally molded with the corresponding connecting portion 45 a or 45 b and with the party

  annular central 40 continuous and reinforced by the nerves

  41 Each fixing boss 61, 62, 63 has a

  central bore 64 substantially parallel to the rotor axis 65.

  The generally cylindrical bore 64, if necessary with a screw-engaging pilot hole 66, is generally foundry-cast with the outer casing 17 made of a much more rigid aluminum alloy than the casing. rotor 15 but relatively softer than steel The bore 64 is provided with a thread in which is engaged a screw 67 for fixing the pump unit on a support structure 68 such as a boiler body L rotor casing 15 being made of a relatively soft material, it would be possible to provide smooth bores 64 in which

  would come to engage a self-tapping screw.

  The assembly and operation of the pump unit according to the invention will now be described. The entire electric motor being prepared and mounted, it is equipped with the pump rotor 1 mounted cantilever at the end of the pump. 2 The outer casing 17 surrounds the rotor casing 15 which is thus positioned in position.

  rotation by engagement of the peripheral output connections

  30 and 31 in the corresponding cutouts 37 and 46.

  The outer casing 17 is positioned axially with respect to the rotor casing 15 by axial support of the annular rib 34 on the convex surface 42 of the outer annular face 43 of the casing 15. The bottoms of the cutouts 37 and 46 then come into contact with each other. in close proximity to the outer surface of the corresponding connectors 30 and 31 without however coming into contact with them. At the same time, the flange 39 is placed in the immediate vicinity of the end.

  of the sleeve 19 by axially trapping the O-ring 20.

  The bearing surfaces 49 and 50 also come in close proximity to the conical bearing surface 29 formed on the rim 28 of

the rotor casing 15.

  The rotor casing 15 thus being equipped with its outer casing 17, is then carefully engaged on the rotor 1 by ensuring that its inner sleeve 16 engages well in the inlet bore 21 of the pump rotor 1 to center the latter, and that the sleeve portion 26 engages inside the centering bore 7b to the abutment of the seal of the bearing face of the section 26 on the peripheral surface of support 24 of the flange 9 The tightness of the pressure chamber 69 containing the pump rotor 1 is then ensured with respect to the stator of the electric motor which is isolated from the rotor by the rotor tube 6 resting on the parts of the stator through two seals

  O-rings (the seal 10 and the seal 10 a).

  The fastening lugs 51 and 52 can then be tightened on the corresponding lugs 57 and 58 of the motor casing 7 by engaging the screws 55 and 56 in the corresponding holes 53, 54 and tightening them by the nuts 59. , 60 The slight deformation, during the tightening, of parts of

  substantially hemicylindrical linkage 45 a and 45 b of the enven-

  rotor loppe 15, that at the same time as the annular abutment surface of the rib 40a is applied to the convex central surface 42 of the annular outer face 43 of

  the rotor casing 17, the bearing surfaces 49 and 50 come into contact with each other.

  firmly abut the bearing surface 29 of the flange 28 thereby limiting the compressive deformation of the cylindrical ring portion 22 of the rotor casing 15, much more

  flexible and flexible as the outer shell 17.

  The pump assembly thus mounted comprises a flexible pump body inside, to cooperate well with the rotor 1, a material resistant to aggression of the liquid transported (here hot water) and not creating electrical torque with the pump rotor also made of composite plastic material (generally in two parts welded by ultrasonic friction) The outer casing 17 protects the rotor casing 15 with respect to external mechanical aggression and allows its fixation rigid to a support or a support structure, so as to support the external cantilever

  electric motor much heavier than the pump.

  To connect the pump set assembled according to the invention

  its fluid inlet and outlet connections, the body

  pump can be engaged axially by its internal bore.

  18 a on the suction pipe 13 already in place, the

  fixing screw 67 are then screwed into the tapping bore

  dice 64 corresponding bosses 61, 62 or 63 brought opposite

  of these screws, to the engagement on the suction pipe 13.

  When the motor pump unit is rigidly fixed in position on the suction pipe 13, it is then possible to engage a discharge pipe 14 provided with its O-ring seal 36, in the cylindrical bore 35 of the discharge connection 31 A seal ring could also be permanently placed in an annular groove at

inside the bore 35.

  When the pump mounted works, it generates in the pressure chamber 69 an overpressure which tends to inflate the rotor casing 15 Fortunately, in the mode of

  embodiment according to the invention, it is surrounded directly

  Wherever there are important sections capable of inducing high pressure stresses, by the rigid outer casing 17 only are subjected to the action of the pressure without the reinforcement of the outer casing 15, the

  peripheral connectors 30 and 31 which have either

  thicknesses (connection 30), reinforcements and ribs (connection 31) allowing them to withstand the action of the

pressure.

  In some embodiments, it is possible to provide for the manufacture of a first type of pump (eg, washing machine drain pumps) operating at low pressure and at moderate liquid temperatures and having only a rotor casing. plastic and / or composite, fixed on the frame or the engine support by simple or easily removable means such as pivoting flanges or rollbars A second type of

  manufactured pump uses the plastic rotor shell

  and / or composite, reinforced by the monobloc outer casing according to the invention for conveying fluids under

  pressure and / or at higher temperatures.

  which has been shown for a single-stage single-stage pump

  rotor can, of course, be used for multi-purpose

  staged with multiple rotors in series on the same motor shaft and the electric actuating motor 4 can be

  replaced by an engine of another type, for example,

internally.

  Of course, the present invention is not limited to the embodiments described and shown but it is capable of numerous variants accessible to the man of

  art without departing from the spirit of the invention.

he

Claims (10)

  1. Pressurized chamber body, in particular pump body, consisting of a rotor casing, integral, annular generally centered on the rotor and having an inlet connection opening at the center of an annular outer face, at the least one output peripheral connection and one open face intended to be closed by pressing a peripheral rim on a support body, characterized in that   has an outer shell (17) monobloc more resistant   and rigid than the rotor casing (15) and adapted to bear axially, by a central annular portion (40) surrounding the inlet fitting (18), on the outer face   ring (43) of the rotor casing (15) and to be   at least partially at the periphery of the rotor casing (15) excluding the at least one peripheral outlet connection (s) (30, 31) by a connecting portion (45) connecting a portion of front support (47, 48) and the central annular portion (40) and in that said front support portion (47, 48) is provided with at least two lugs or supports (51, 52) for fixing of said outer casing (17) on said support body (7 a) by applying fastening means such as screws (55, 56), the rotor casing (7) in a sealed manner by its flange   peripheral (23) on the support body (7).   2 chamber body according to claim 1, characterized   rised in that the legs or supports (51, 52) are associated   each to bearing surfaces (49, 50) of the outer casing   (17) on a carrying surface (29) provided on the outside   interior of said peripheral rim (28) of the envelope of rotor (15).   3. Chamber body according to claim 1 or 2, characterized in that the connecting portion (45) of the envelope   one-piece outer surface (17) projecting at least two bosses   ges (61, 62, 63) for front fixing of said envelope   on an outer support (68).   4. Chamber body according to claim 3, characterized   characterized in that each fixing boss (61, 62, 63) has a bore (64) substantially parallel to the rotor axis (65)   and adapted to receive a fixing rod (67).   5. Pressure chamber body according to any one   conque of claims 1 to 4, characterized in that said   connecting portion (45) of the outer casing has a bell-shaped, the flared central portion of which is traversed by at least one cutout (37, 46) open on the front support edge (47, 48) and allowing the passage a connection of   peripheral output (30, 31) of the rotor casing.   6 Pressure chamber body according to any one   one of claims 1 to 5, characterized in that   the central annular portion (40) of the outer casing (17) is traversed by the inlet fitting (18) and is surrounded by an open sleeve portion (38) which terminates externally by a flange (39); ) able to surround the outer edge of said inlet fitting, leaving free the passage of a conduit of   connection (13) to the inlet fitting (18).   7. Pressure chamber body according to the claim   6, characterized in that the flange (39) overflows slightly   inwardly of an outlet bore (18b) in the inlet fitting (18) so as to axially retain in position an annular seal (20) disposed in said output bore (18b).   8. Pressure chamber body according to any one   one of claims 1 to 7, characterized in that   monoblock rotor wheel (15) is made of a flexible and corrosion-resistant material by the liquid carried by the pump, for example, made of plastic or composite material based on fibers, and cooperates with a rotor of   pump (1) centered and guided on the internal outlet (man-   16) of the inlet connection (18) and that the rotor housing (15) is devoid of any means and any attachment accessories such as tab or bore but has an open outer face of the flange (23). adapted to cooperate sealingly with a fixing ring (7 a) of the envelope (7) drive motor.   9. Pressure chamber body according to any one   one of claims 1 to 8, characterized in that the   external veloppe (17) is made in one piece by molding in a metal such as an aluminum alloy capable of receiving screws self-tapping steel.   Motor pump unit comprising a rotor pump unit mounted cantilevered on the shaft of an electric drive motor and an electric motor unit consisting of a rotor tube sealingly sealing the rotor and its bearings and a stator housed in an engine casing,   characterized in that the pump rotor (1) mounted on the shaft   motor (2) is housed inside a chamber   under pressure according to one of claims 1 to 9 and   the one-piece outer casing (17) is rigidly attached to a ring gear (7a) of the motor casing (7) by sealingly applying the rotor casing (15) to the casing   motor (7) so as to delimit a chamber under pres-   (69) containing the pump rotor (1) and the interior of the rotor tube (6).