DE1528640A1 - A heating circulation pump without a stuffing box with plain bearings made of a very hard, preferably sintered material - Google Patents

Description

Heating circulation pump without a pot buff with plain bearings from a sear hard, preferably sintered one

Jerkstoff »

The invention "relates to a glandless Heating circulation pump with plain bearings made of a very hard, preferably sintered material, the bearing parts of which are made from consist of this material and one bearing part on the two shaft ends of the pump shaft and the other bearing part is arranged in the pump housing.

Known circulating pumps of this type without a stuffing box are preferably used in heating systems. The bearings are water-lubricated, but very sensitive to contamination of the water. Even if all installation work is properly carried out, it is not closed. avoid that ! residues of many kinds remain. This can be foundry sand from cast parts or cast radiators , but it can also be scale that has remained in the steel pipes, and welding

009829/0212

© AD

residues arise that are found during the laying of the Lead formed, it can also be sand and mortar from construction work or lime in the heating water. Against all of these impurities are the plain bearings of the circulation pumps, mostly from the conventional ones. Bearing materials such as bronze, Coal or plastic are still sensitive, despite appropriate efforts. Mostly it works it is not possible to free the system from dirt particles and dirt traps such as sieves also do not feed the desired successes. The sieves can become clogged with alluvial debris. The bearings must Occasionally run dry, for example Avas when installing the pump or at higher water temperatures. The pump bearings should also be used against the proportion of solder grease in the heating water, which is due to its special composition attacks both coal and bronze bearings, be insensitive. Eventually, bad parts will also go through unwanted differences in the material composition causes which are the cause of premature bearing wear.

It is, for example, an elastic mounting of Shafts and axles with G-Ieitlager "belcannt, whereby the rubber-elastic fastening of a bearing bush

0Ö9829 / 0212 - 3 -

. BAD OF ² UGfNAL

"Ceramic material in a housing". 3s . So this is primarily a elastic mounting, but not around ■ -a cardanic Suspension of the bearing bush ". In the case of a cardanic movement of the shaft, the massive Rubber parts on 'this shaft considerable back-up : Forces that result in too high edge pressure and thus too considerable Wear the layer. Also, time this known storage. The disadvantage that a radial Wellenvers3, ts is easily possible under load. .

3s is also known a "reduction in the bearing load of a dielectric motor running in liquid, in particular for liquid circulating pumps and under water drive, see German patent specification 1 113 54P * Not designated ring-shaped elements provided. These elements are not suitable for a cardanic suspension, since the bushings they carry are axially fixed to the housing. This known bearing is therefore only suitable for absorbing purely radial displacements.

The same also applies to another known circulation pump, whose pump body with which the impeller drives

009829/0212 / -

152864G

Benden electric motor is releasably connected, between. whose stator and rotor a can and sealing elements are arranged, see the German G-erauchsmusterschrift 1 895 968. This is because ring-shaped elements are provided, which are likewise only purely radial Allow movements of the bearing bushes - as the latter is axiol are firmly clamped to housing parts.

By the ESB- ^ irmenschriften 1126.21 and 1126.22 are Circulation pumps without a stuffing box known for extreme operating conditions. This includes a complex coolant circuit provided that the entire Hotor part recorded. In addition, the pump housing is designed with a relatively large Viand thickness, which indicates operating pressures. The shaft is supported by two completely separate bearing systems. One system contains two purely radial bearings, the second system a pure axial bearing. The bearing bushes of the radial bearings are fitted in the housing. This snug fit must inevitably be very tight in order to prevent radial fluttering of the known relays. A cardanic movement option is therefore for this camp excluded. The two tracks continue to show. of the well-known axial bearing in the area of their Contact with the housing or with the housing cover annular elements. However, these cannot

00982970212 - - 5 -

15286 4C

_ 5 -

serve for cardanic suspension of the pump shaft, v / eil the already existing radial bearings a cardanic Do not allow movement of the same. Otherwise is the drawing of the company font is very indistinct, so that it is not exactly clear whether these annular elements may not only have a sealing function. A description is not attached to these three company honors.

The same applies to KSB's corporate publications 1127.21 and 1127.23, and show the pumps illustrated therein the already mentioned bearing construction, as far as this can be inferred from the company documents.

Through the magazine "Power Design and Equipment Application Section ", May 1962, pages 59-61." is it known da, ß with water-lubricated pump bearings the Combination of bearing and journal from the same, very hard material shows good results. The material with the best results it is generally referred to as "carbide". Obviously, this is a Hard metal, such as a tungsten carbide. This magazine However, i3t cannot be inferred whether this is known Pump is a heating circulation pump of the cooling water of the particular pollution mentioned subject.

009829/0212 _r JL -, "---,

BATH ORIGINAL

152864C

• Ml fi ". _Lmm

In the magazine "Kernenergie", 5th year, 1962, issue 1, pages 9 and 11, the material Al ₀ O _{7 is} mentioned in addition to many other 'material combinations /

- ■ 2 3

In table 2 on page 11 you can find the Successfully tested combinations, however, only one, with one and the same for the bearing bush and bearing journal Material, namely "titanium carbide T-77" was used. ' The two aluminum oxides as bearing bushes were used paired with a bearing pin made of "3? irthite H-13", Pirthite has the composition $ 13 Go, rest Wc and should be a Be carbide.

The invention is based on the object, the stuffing boxless heating circulation pump of the type mentioned so to improve that a perfectly flawless puncture even with a relatively high degree of soiling of the Heating water is guaranteed. -

The solution to this problem by the invention consists in that the sliding bearing parts of the pump shaft and of the pump housing, as is known per se, the same composition and have the same hardness of their material that all bearing parts made of a single material are preferred Sindered Od-Alujninium-Oxyd of high purity exist and that the outer bearing part in the pump housing can be gimbaled, but includes purely radial displacement,

009829/0212 V - ~ ^Ί "

is formed and arranged. This also makes the G-risk of edge pressure avoided with rigid Installation of the logger is possible and the cause may be that dirt particles can easily get into the storage compartment in this case can get. In this respect, the all-round spatial jiev / eglieh ^ eit de-o outer-bearing part is in harmony important with the selection of storage materials.

The invention assumes that the -Ausv. ^r e2il of Lagerv / erkstoffkombinationen not bring an increase in VerschleiiSfestigkeit, as previously believed erroneously even in hard metal. By contrast with the previous view, the invention now achieves a surprisingly high and almost unlimited wear resistance, in particular against dirt particles in the heating water.

In a further embodiment of the invention it is provided that an O-ring. or a similar easy mobility permitting singing element, predominantly provided with a spherically curved surface, is the bearing of the pump shaft about, in the middle of the bearing and is enclosed by a hole in the pump housing and at least has a line contact.

It can be provided in an advantageous manner that

009829/0212 - 8

- 3 - ■

the on: imhmebohrung in the i-map housing has an inwardly directed "approach and the bearing has a .bund and the end faces heider receive the liiugelement between them .; As a result, the intermediate element, which ensures the cardanic mobility of the pump bearing, is arranged largely protected, The suction element can consist of a suitable plastic, but it can also be largely inelastic, so that the line contact and the easy movement in all directions of the bearing is maintained for long years of operation. which only needs to be a few degrees or sometimes only degree minutes, but must be able to take place so easily that no greater force is required for adjustment than is normally equivalent to acting as a bearing load on the sliding surface of the bearing known elastic mountings of bearings do not meet this condition, namely has an elastic If there is surface contact with the element, the adjustability is limited, so that the restoring forces that the bearing must absorb increase, which can go so far that such a design is tantamount to a rigid structure. But then the very hard bearing materials would not be usable, in which only the knowledge according to the invention becomes valid that G-guide surfaces

0098 29/0212 - 9 -

the same hardness the Yorteile in terms of wear still greatly enlarge. That according to the invention used high purity OC aluminum oxide as the bearing material the same hardness results in excellent behavior, especially in the case of: Presence of wear-resistant I components in the pumped medium and shows a clear Superiority over those previously used in the circulating pump system Storage materials. In addition, with this material there is no risk of alloy fluctuations, that of multi-material materials, including hard metals reckon, cause for hardship may vary. However, the optimum effect is achieved when the Storage throw material of the bearing parts sliding on top of one another Pump shaft and the pump housing have the same composition and have the same hardness. This preferred bearing material can also be relatively easy and process them cheaply into the bushings and sleeves and washers required for the construction of the bearing by sintering and bring it into lorm. The bearings of the invention are therefore also highly economical.

Further advantages and details of the invention emerge from the description of some exemplary embodiments which now follows referring to the drawing. In this demonstrate: *

009829 / Ö212

" ¹⁰ J ^

152864C

- ίο -

• Pig. 1 a stopper-free circulation pump with both F / ellenenden arranged bearings of the invention Training and arrangement.

Pig. 2 shows the schematic representation of the bearing arrangement according to Iig. 1 in. Enlarged scale schematically with a hinge lernent with a double diametral .Line contact,

5 ¹ Ig. 3 shows a modified embodiment of the bearing according to Pig. 1 and 2 with a suction element with line contact on the pump housing and

IPig. 4 shows a modified embodiment of Pig. 3 with one Ring element with. Line at the warehouse.

The one in the Pig. 1 shown heating circulation pump has the Pump housing 1, its suction side with 2 and its pressure side is designated by 3. The motor housing 4 is flanged to the pump housing. The stator of the motor is denoted by 5 and its rotor by 6. The rotor sits on the pump shaft 7 j the one on the side of the pump housing 1 carries the pump impeller 8, which is fixed to the pump shaft connected is. The two shaft ends are pegs 9 and 10 formed whose diameter is small? is as that of the pump shaft 7. There are washers on these journals

003829/0212, - 11 -

; ■■ "■■ ■ · ■ .:;,. SsÄD QHlGiMAi

1528B4G

1 ι aufgerite.ckt .. which rest against the face of the l '/ ellonabsataes, also wear these Zs.pfen a preferably' glued-on sleeve 12. The. The disk 11 and the sleeve 12 form the bearing part connected to the shaft. Lie hörisοntal arranged pump shaft? - is in the two. Bearings 13 gelc.gert, for gimbals are designed to be movable. The bearing 13 has a collar 14 towards the rotor. An Ilingeleraeiit sits approximately in the middle of the bearing on the inconsistent rope of the bearing. '\'} _t that in the I? ir :. 1 and 2 represented as O-ILin ^ iat. ". Ijer Hing-15 is preferably made of a suitable. Plastic which is largely unelaBtisch and the bearing 15 surrounds by Linienberühruns' \ G. The cv / eite line contact 17 is located diametrically to the inner line contact 16. This second Lfinienberührung has Eingelemer_t on Purapengehaus e 1, which here is provided with a receiving bore 18. This receiving bore is offset in diameter and has an inwardly directed base 19. The O-hanging 15 lies between the opposing end faces 20 and 21 on the collar 1.4 and on the base 19.

The bearing parts 11, 12 and 13 consist of a very hard, preferably sintered material and preferably made of Oc-aluminum oxide of high purity, that for everyone Bearing parts same composition and same hardness lia, t.

: '■ 009829/0212

152864C

- i 9

jji? Leiden other embodiments according to the Pi; .. 5 and ■ - ■; differ from that according to Pig. 1 and 2 only with regard to the! Shape of the! ^r dn '. elements. Grr-'ä £ der.:msf uhrform after Pig. ?. has-ur-.σ i.iix> .r element 'i5a has a spherical surface on its outer circumference and has only one line surface, 17, ra; rilich B, n housing 1, while the ring element V'jii with A cylindrical inner surface rests on the bearing 15. This shape of the jingle element is reversible. According to rig .

In general, the double line touch according to the embodiment of the J? Ig. 1 and 2, however, give the gate move. The agreement reached by the IiiiiigeleLient light kardanisc-he BeweglicM ^j: However ince 'de' s bearing part 13 includes at existing all-round mobility a purely radiale'Bewegung of La-gers, so that · the. central! management of the Pvjnpenwelle gev / älirleistet remains.

- Patent claims: -

- 15 -

■■ ^; - " - ■ '■ ■; ■

0098 29/0212

Claims (6)

- 13 - 3025 '. V / u ".. ■ ■ T 15 - 23 540.5 a te il ta η s ρ r "U. che: ./GtopiTDÜcIisenlose Helzimgsuniwälzpiunpe with plain bearings made of a very hard, -foraugsWeise sintered material The fact that the bearing parts (11, 12, 13) of the pump shaft (7) "and the pump housing (1), as is known per se", which end up sliding on one another, have the same composition and the same hardness of their material Bearing parts consist of a 3i) instoff material, preferably sintered QC -aluminum oxide of high purity, and that the outer bearing part (13) is designed and arranged in the pump housing so that it can move gimbally, but excludes purely radial displacement. 2. Circulation pump according to claim 1, characterized geke η η ζ ei ch η et that an O-input or a similar easy mobility permitting, predominantly with 009829/0212 ^ 152864C spherically curved surface versehercfb iiiragelement. (15, 15a, 15b) the. Bearing (.13) of the riimpenwelle approximately in the middle of the bearing and enclosed by a bore (18) in the pump housing (1) " and has at least one line!) 3. Circulation pump according to claim 2, d a d li r c h g e mark t that the ring element "(i ^ 'b) has line contact (16) on the bearing (13). 4. Circulation pump according to claim 2, - d a d u r c h; g e k e η η ζ e i c h η e t that the ring element (15a) Line contact (17) on the pump housing (1). 5. Circulation pump according to claim 2, dadurchge Ic e 'η η ζ calibration η e t - ", - that the" ring element. (15) has line contact (16, 17) on the bearing (15) and on the pump housing (1). 6. Circulation pump according to claims 2- 5 »thereby g e k e η η ζ e i c h η e _t that the mounting hole (18) in the pump housing (1) has an inwardly directed projection (19) and the bearing (13) has a collar (.14) the end faces (20, 21) of both receive the ring element (15, 13a, 15 "b) between them. 003829/0212 Blank page