JPS5828438B2 - centrifugal pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to centrifugal pumps, particularly water pumps for vehicles.

This type of pump consists of a housing, a shaft rotatably disposed in the housing by means of bearings, a foil having a boss attached to the shaft, an intermediate ring for one force, and an intermediate ring fixed to a flexible member for the other force. a seal having a friction ring elastically pressed against the seal;
The intermediate ring and the flexible member are fixed to each coupling member, one of the coupling members is mounted in a groove in the housing and engages a shoulder of this groove, and the other coupling member is fixed to the foil boss and Φ something is known.

Conventionally, such pumps are assembled by successively providing a shaft with a bearing in the pump housing, a seal, an intermediate ring, and a foil at the end.

This method of assembly has various drawbacks, including the difficulty of assembling the various components with the necessary tolerances for satisfactory operation.

Therefore, the friction surfaces of various rings and intermediate rings must remain completely clean against scratches.
Side stop is ensured.

Moreover, such an approach is expensive due to its complexity and results in a large amount of waste.

Finally, management is complicated by the large number of parts.

The object of the invention is to provide a pump of the above-mentioned type in which the bearing shaft, the seal, the intermediate ring and the foil are formed as a unit so that it can be installed in a single assembly step in a two-pump housing. The aim is to eliminate the shortcomings in

To this end, in the pump according to the invention, the foil has a plurality of angularly disposed openings, one of the connecting members having a radial thrust surface facing the opening, and one of the connecting members having a radial thrust surface facing the opening. A retaining member having a fixed axial position is provided to retain the assembled sealing device during assembly within the housing.

The shaft, foil, intermediate ring and seal are made as a unit that is assembled before being installed within the pump housing.

This installation process is carried out by means of a mandrel having a plurality of fingers arranged in such a way that the projecting fingers can cross the opening in the foil and engage the thrust surface to install one of the connecting members into the groove. It is done in a very simple manner.

The invention will be better understood from the following description of some embodiments, taken in conjunction with the accompanying drawings, in which: FIG.

The pump shown in FIG. 2 has a housing 1 in which the unit shown in FIG. 1 is provided.

A sealing plate provided on the housing 1 after the unit is installed is not shown.

The unit in FIG. 1 has a shaft 2 with a bearing, a sealing device formed by a seal and an intermediate ring, and a foil.

The bearing has two rows of balls 3a, 3b provided between a cage 4 and a groove 5 formed in the shaft 2, the cage 4 being tightly fitted into a hole 6 in the housing 1.

Two transverse seals 7.8 are provided to prevent the grease contained within the bearing from leaking to the outside.

The foil 10 is attached to a boss 11 fixed to the shaft 2 at the end of the shaft 2 remote from the bearing.

The foil 10 is of the type described in French Painting Patent No. 1,300,199 and has a stamped metal flange with alternating protruding sectors 13 and hollow sectors 14.

The opening 15 improves efficiency as described in the above-mentioned patents and allows for the installation of the unit in the manner described below.
is provided in the hollow sector 14.

The foil 10 is attached to a steel boss 11 attached to the shaft 2 by caulking and brazing.

The sealing device comprises an intermediate ring 16 as a movable part attached to the shaft 2 via a sleeve 17, and a thick external extension part 2 provided in a recess 9 of the housing 1 with a shoulder 9'.
1 and the intermediate ring 16 so that it comes around the seal.
It has a friction ring 19 as a fixed part added to the pump housing, which is attached to a flexible member 20 having a spring 22 that presses the ring 19 against the pump housing.

In FIG. 1, the sealing device is shown in the released state and in the form of a stamped metal part, but is assembled by means of an engagement body formed by a centrifugal ring 27, which can be made of plastic material or molded elastomer. .

The outer extension part 21 of the seal has the opening 1 of the durbin on the foil side.
5 forms a radially facing thrust surface, the force side terminating on the foil side by a flange 25 forming an engagement surface for engaging the shoulder 9'.

The mandrel MG used for attachment has a nose G in contact with the end of 32 and as many fingers D as there are openings 15 in the foil.

The addition process is as follows.

2) The pump housing 1 is heated in a dryer to a temperature compatible with the materials used and which can be between 120 and 160°C.

2) The unit is placed on the mandrel M and the fingers D of the mandrel M are introduced into the openings 15 of the foil.

3) Pump housing 1 in which the hole 6 is enlarged by expansion
is secured to the low-pressure or hydraulic slide in such a way that it is exactly centered and properly aligned with the unit.

4) The pump housing 1 is lowered onto the unit by the mandrel M into a relative axial position determined in particular by the ends of the fingers D and the extensions E.

The axial distance between the end faces of the fingers D and the end faces of the nose C is such that, once the unit is installed in position, the distance between the shoulder 9' and the contact surface between the intermediate ring 16 and the friction ring 19 is The spring 22 is compressed to a size indicated by the distance L (FIG. 2).

This dimension must be fixed because the sufficient operation of the sealing device depends on it.

This installation process involves adding the cage 4 in the hole 6 of the barrel and 77 [1] of the outer extension part 21 of the seal in the groove 9 of the housing 1.
Heat and adjustment of the compression force exerted by the spring 22 can be performed at the same time.

Once the unit is assembled 5, the seal is removed from the centrifugal ring 27 and directed into the opening 28 which releases the liquid droplets, and an air population 29 is formed in the pump housing.

This allows checking the condition of the sealing device and prevents condensation which could endanger the bearing.

When the pump housing 1 is cooled down, the bore 6 is contracted and the cage 4 of one bearing is radially tightened to ensure optimal operation of the bearing.

Furthermore, since the forces used for installation are low, there is no risk of damaging the bearing due to excessive axial stresses.

Once the mandrel M has been removed 5, it is only necessary to fasten side stop plates (not shown) to the housing 1 to have the pump ready for use.

The pump is therefore constructed with a non-electrical, simple, single-operation device that ensures precise adjustment of the seal compression.

Furthermore, the use of the described unit further simplifies storage problems.

4-7 show another embodiment of a pump according to the invention.

In the embodiment according to FIG. 4, the cage 3 whose end 61 is a bearing
1 and has a flange 62 at the other end serving as the flange 25 of the embodiment shown in FIGS. 1 and 2.
This will hold the seal in place.

7 langes 62 compress rubber O-rings 63 to provide a static seal within pump housing 31.

The seal has a metal box 51 fastened to a flexible member 50 and secured to a shoulder 64 of a spacer 60.

In this example, the seal is shown sized in the operating position prior to assembly of the pump.

The spacer 60 is an opening 58,59 in the pump housing 31.
The openings 68 and 69 are provided perpendicularly to the axial direction, and water droplets are removed by a centrifugal ring 57.

In this embodiment, the mounting mandrel M only has fingers D that are directly engaged with the flange 62.

Therefore, the thrust of the shaft 32 is no longer necessary since the joint is already installed.

The foil 40 (M), unlike the foil 10 of FIG.

Another preferred embodiment of the invention is shown in FIG. 5, in which the length of the pump housing can be made sufficiently short.

Ball bearings 73a, 73b are held in place in the usual manner by snap rings 75a, 75b and spacers 76 provided within box 74.

Seals 77,78 prevent leakage of the grease necessary for bearing lubrication.

Box 74 has an extension 90 which serves the same function as shoulder 64 of spacer 60 of FIG.

The extension 90 terminates in a flange 92 which acts as an engagement during installation of the extension 90 into the pump housing 71 and compresses a seal 93 forming a static seal.

The box 74 has an opening 58 , 59 provided in the axial direction towards the centrifugal ring 57 .

The mandrel M is the same as that in FIG. 4, and the axially arranged seals are secured together before assembly.

The arrangement of FIGS. 6 and 7 is the same as that of FIGS. 4 and 5, the difference being that the intermediate ring is fixed to the pump housing and the seal is fixed to the shaft.

Therefore, the seal rotates and the intermediate ring remains stationary.

It can be seen from FIG. 6 that intermediate ring 116 is secured to spacer 130 by attachment to shoulder 134 via resilient seal 121 and flexible member 120 is added to shaft 102.

In the configuration of FIG. 7, intermediate ring 156 is similarly attached to extension 150 of box 145 to which the cage of bearing 144 is attached.

[Brief explanation of the drawing]

1 is an axial cross-sectional view of an embodiment of the unit according to the invention consisting of a shaft, a seal, an intermediate ring and a foil; FIG.
3 shows an end view of the central part of the mounting mandrel, and FIGS. 4 to 7 show a second embodiment showing an alternative embodiment. It is a figure similar to the figure. In the diagram, 1...- Housing, 2... Shaft, 3
a. 3b...Ball, 4...Cage, 5...
・・・Groove, 7, 8... Seal, 9...
Recessed part, 9'...Shoulder part, 10...Foil, 11...Boss, 16...Intermediate ring, 17...Sleeve , 19...Friction ring, 20...Flexible member, 25...
・Flange.

Claims (1)

[Claims] 1 Housing 1 and bearings 3a, 3 inside this housing.
b, a foil 10 with a shaft 2 rotatably mounted by 4 and a boss 11 fixed to this shaft; - an intermediate ring 16 on the force and fixed on a flexible member 20 on the other hand, said intermediate ring; a sealing device having a seal with a friction ring 19 elastically pressed against the intermediate ring and a flexible member (and each connecting member (which is fixedly attached to one connecting member 2).
1 is installed in the recess 9 of the housing and engages with the shoulder 9' of the recess, the other connecting member 17 is fixed to the foil boss, and the foil has a plurality of angularly arranged The coupling member 21 has an opening, the coupling member 21 is provided with a radial thrust surface facing the opening, and is provided with a retaining member 27 having a fixed axial position relative to the shaft, the retaining member being located within the housing of the sealing device. A spring-loaded flexible member is engaged to assemble and hold the sealing device prior to installation of the sealing device to the housing, and a flexible member engages a shoulder of the housing during installation of the sealing device to the housing. This is a type of centrifugal pump that compresses the spring and separates the sealing device from the holding member.] - A type of centrifugal pump that allows for a suitable space between the housing and the sealing device.