阅读说明：本技术 具有双壳式间隙罐的磁耦合泵 (Magnetic coupling pump with double-shell type gap tank ) 是由 T·埃施内尔 于 2019-06-06 设计创作，主要内容包括：本发明涉及一种磁耦合泵(1),其具有：泵壳体(3)；封闭所述泵壳体(3)的壳体盖(4)；和间隙罐(5),所述间隙罐具有金属的内罐(6)和陶瓷的外罐(7),在所述外罐上构造有法兰(8)。本发明的任务是,给出一种相对于现有技术改进的泵,所述泵提供简单且可靠的结构,并且能够实现不复杂且快速的制造、装配和维护。尤其应给出一种可靠且能量高效的泵。为此,本发明提出,所述内罐(6)与所述壳体盖(4)焊接,并且所述外罐(7)通过所述法兰(8)上的夹紧环(9)抵着所述壳体盖(4)被夹紧。(The invention relates to a magnetic coupling pump (1) comprising: a pump housing (3); a housing cover (4) closing the pump housing (3); and a gap pot (5) having a metallic inner pot (6) and a ceramic outer pot (7), on which a flange (8) is formed. The object of the present invention is to provide an improved pump in relation to the prior art, which provides a simple and reliable construction and enables uncomplicated and rapid manufacturing, assembly and maintenance. In particular, a reliable and energy-efficient pump should be provided. For this purpose, the inner vessel (6) is welded to the housing cover (4), and the outer vessel (7) is clamped against the housing cover (4) by means of a clamping ring (9) on the flange (8).)

1. A magnetic coupling pump (1) having:

-a pump housing (3);

-a housing cover (4) closing the pump housing (3); and

-a gap pot (5) having a metallic inner pot (6) and a ceramic outer pot (7) on which a flange (8) is formed,

characterized in that the inner vessel (6) is welded to the housing cover (4) and the outer vessel (7) is clamped against the housing cover (4) by means of a clamping ring (9) on the flange (8).

2. Pump (1) according to claim 1, characterized in that the pump (1) has a drive (10) and a rotor (11), between which the gap pot (5) is arranged, wherein the rotor (11) is supported in the gap pot (5) by means of a pump support device (12), wherein the pump support device (12) is fastened on the housing cover (4).

3. Pump (1) according to claim 2, characterized in that the pump support means (12) is fastened to the housing cover (4) by means of a threaded connection (13).

4. Pump (1) according to one of claims 1 to 3, characterized in that a flat seal (14) is arranged between the flange (8) of the outer tank (7) and the housing cover (4).

5. Pump (1) according to claim 4, characterized in that the clamping ring (9) exerts a pretension on the flat seal (14).

6. Pump (1) according to one of claims 1 to 5, characterized in that a pressure monitoring line (15) is formed in the housing cover (4), which opens into an intermediate space (16) between the inner tank (6) and the outer tank (7).

7. Pump (1) according to claim 6, characterized in that a pressure sensor (17) for pressure monitoring of the intermediate space (16) is connected to the pressure monitoring line (15).

8. Pump (1) according to one of claims 1 to 7, characterized in that the inner tank (6) is formed of a nickel-based alloy.

9. Pump (1) according to one of claims 1 to 8, characterized in that the outer tank (7) is formed from zirconium oxide.

10. Pump (1) according to one of claims 1 to 9, characterized in that a flat seal (18) is arranged between the housing cover (4) and the pump housing (3), wherein a fastening (19) of the housing cover (4) on the pump housing (3) exerts a pretension on this flat seal (18).

Technical Field

The invention relates to a magnetic coupling pump having a pump housing which is to be received, a housing cover which closes the pump housing, and a gap pot which has a metallic inner pot and a ceramic outer pot, on which a flange is formed.

Background

It is known from the prior art that in magnetic coupling pumps, when a high degree of reliability is required, the gap pot is constructed in a two-shell manner with an inner pot and an outer pot. Two gap cans are provided, one inside the other, each of which is designed for the operating conditions. The system remains sealed when one of the two gap cans is damaged. A disadvantage of these double-walled gap cans is that the eddy current losses during operation are doubled. The energy consumption of a correspondingly equipped magnetic coupling pump is therefore significantly higher. Heating of the gap tank also causes the transport medium to boil. Furthermore, the outer tank is not flushed with the conveying medium and must be cooled accordingly. The cooling of the outer vessel is usually performed by metal contact with the inner vessel, to which heat is transferred. The ceramic configuration of the outer vessel reduces heating and improves energy efficiency because no eddy current losses occur in the ceramic material of the outer vessel. The residual heating of the metal inner vessel can be controlled by cooling with the medium delivered.

The double-shell gap tanks known to date, which have a metal inner tank and a ceramic outer tank, have the disadvantage that their construction is complicated, so that the production, assembly and maintenance of the respective pump is complicated. In particular, the structure of double-shell gap tanks made of different materials is often difficult to seal, so that the reliability increase achieved by double-shell gap tanks is offset by the additional sealing area.

Disclosure of Invention

The object of the present invention is therefore to provide an improved pump which offers a simple and reliable construction and which enables uncomplicated and rapid manufacture, assembly and maintenance. In particular, a reliable and energy-efficient pump should be provided which also meets the DIN/ISO 2858 standard, for example.

This object is achieved by a pump having the features of claim 1.

According to the invention, a simple and reliable construction can be provided in a magnetic coupling pump of the type mentioned at the outset by welding the inner vessel to the housing cover and clamping the outer vessel against the housing cover by means of a clamping ring on the flange. Welding the inner vessel to the housing cover allows savings on otherwise common seals between components. Such a seal as a weak point in the construction can therefore be dispensed with, and the inner vessel is simply and sealingly connected to the housing cover by means of a weld seam. By clamping the outer vessel against the housing cover by means of a clamping ring on the flange, the ceramic outer vessel can be fixed to the housing cover without complication to form a double-shell gap vessel. The assembly of the pump is simplified in particular by: the housing cover can be preassembled with the two tanks of the gap tank as a unit in a simple and trouble-free manner.

Advantageous embodiments and embodiments of the invention result from the dependent claims. It should be noted that the features listed individually in the claims can also be combined with one another in any and technically meaningful manner, and thus represent further configurations of the invention.

According to an advantageous embodiment of the invention, the pump has a drive and a rotor, a gap pot being arranged between the drive and the rotor, the rotor being supported in the gap pot by a pump bearing, the pump bearing being fastened to the housing cover. By fastening the pump bearing on the housing cover, a particularly compact design of the magnetic coupling pump can be achieved. Since the pump bearing is fastened to the housing cover, which also carries the two tanks of the gap tank in the double-shell design, a very short design is obtained in comparison with the prior art, which, despite the double-shell design of the gap tank, is almost indistinguishable from the design of a pump with a single-shell gap tank. This has the following advantages: pumps with a double-shelled gap can also be produced, for example, according to the DIN/ISO 2858 standard. The proposed pump can thus be exchanged simply in a connection-compatible manner with a conventional pump having a simple gap pot.

Particularly preferred is an embodiment in which the pump bearing is fastened to the housing cover by a screw connection. With such a threaded connection, the pump bearing can be fastened very simply to the housing cover and can be removed simply for maintenance work.

A particularly advantageous embodiment of the invention provides that a flat seal is arranged between the flange of the outer vessel and the housing cover. By arranging a flat seal between the flange of the outer vessel and the housing cover, a reliable seal can be achieved. The assembly of the flat seal is significantly simpler than the O-ring seals typically used in the prior art. Thereby, on the one hand, the manufacturing and assembly of the proposed pump is simplified, and on the other hand, the structure is made easier to maintain. Furthermore, flat seals are cheaper and also suitable for higher temperatures. In particular, flat PTFE-based seals can be used, which are distinguished by high media resistance, high temperature resistance, high sealing ability which can be achieved, and good ageing and weathering resistance.

In an advantageous embodiment, the clamping ring exerts a pretensioning on the flat seal. The flat seal is clamped by a clamping ring between the flange and the housing cover, i.e. in the flange connection. By applying a pretension to the flat seal, a reliable sealing of the gap between the outer vessel and the housing cover can be achieved by the flat seal. By applying a pretension to the flat seal, slipping of the seal between the components forming the sealing gap can be avoided, which improves the operational reliability of the pump.

A particularly advantageous embodiment of the invention provides that a pressure monitoring line is formed in the housing cover, which opens into the intermediate space between the inner tank and the outer tank. By forming the pressure monitoring line in the housing cover, the space existing between the inner tank and the outer tank can be provided with pressure monitoring. Damage to the gap pot can be easily ascertained by such pressure monitoring. If the pressure in the intermediate space is atmospheric pressure, damage or malfunction of the outer tank can be inferred. Such damage of the outer vessel may occur, for example, when the bearing is damaged, which leads to mechanical contact between the drive and the outer vessel. If the pressure in the intermediate space is at the level of the transport medium present in the inner vessel, it can be concluded that the inner vessel is destroyed by wear, corrosion or mechanical contact with the rotor and that there is transport medium in the intermediate space. In this way, it is possible to detect a fault very easily during operation of the pump, so that a damaged pump can be replaced quickly, i.e. before the medium flows out of the pump into the environment.

According to a preferred embodiment of the invention, a pressure sensor for monitoring the pressure in the intermediate space is connected to the pressure monitoring line. By arranging the pressure sensor on the pressure monitoring line, an automated pressure monitoring of the intermediate space in the gap tank can be achieved. Thus, the damage of the inner or outer vessel can be determined very quickly, so that the renewal of the gap vessel can be started immediately. Environmental damage caused by operation of a damaged pump can thereby be reduced.

Particularly advantageous is an embodiment which provides that the inner vessel is formed from a nickel-based alloy. Forming the inner vessel from a nickel-based alloy has different advantages. With such a nickel-based alloy, a small wall thickness of the inner vessel can be achieved with high strength, in particular high hardness, and good corrosion resistance. It is also advantageous that no hydrogen embrittlement occurs with such materials, so that the hydrogen-containing medium can also be reliably transported by a pump having a corresponding inner tank.

A particularly advantageous embodiment of the invention relates to: the outer can is formed of zirconia. The outer can formed of zirconia has not only improved corrosion resistance but also high compressive strength. The wall thickness of the outer vessel can be made relatively small, so that the gap between the drive and the rotor can be kept narrow, which is advantageous for the efficiency of the pump. Particularly advantageous is a low eddy current loss, which is determined by the ceramic material, i.e. the electrically non-conductive material. In addition to mechanical strength even at higher pressures and higher temperatures, zirconia is also very wear resistant.

In an advantageous embodiment, a flat seal is provided between the housing cover and the pump housing, wherein the fastening of the housing cover to the pump housing exerts a pretensioning on the flat seal. By arranging a flat seal between the housing cover and the pump housing, a simple and reliable sealing of the pump can be ensured during assembly and maintenance. The inexpensive flat seal can be positioned particularly simply between the pump parts, and an excellent sealing effect can be reliably achieved by the pretensioning applied to the flat seal.

The invention may relate to a rotary pump or may also relate to a progressive cavity pump or other magnetically coupled pump.

Drawings

Further features, details and advantages of the invention emerge on the basis of the following description and the accompanying drawings which illustrate embodiments. In all the figures, objects or elements corresponding to each other are provided with the same reference numerals. The figures show:

figure 1 is a cross-sectional view of a pump according to the invention,

figure 2 is a view of the gap can,

figure 3 is a cross-sectional view of the gap can,

FIG. 4 is a side view of a gap can, an

Figure 5 a detailed cross section of the gap can.

Detailed Description

In fig. 1, a pump according to the invention is shown, generally indicated by reference numeral 1. The illustrated pump 1 is configured as a magnetic coupling pump 1. In the embodiment shown, the pump 1 is configured as a rotary pump. The pump 1 has a housing 3 in which an impeller 2 driven by magnetic couplings 10, 11 is accommodated. The pump housing 3 is closed on its right by a housing cover 4, on which a gap pot 5 is arranged, which is positioned between the drive 10 and the rotor 11 of the magnetic couplings 10, 11. The gap can 5 has a metal inner can 6 and a ceramic outer can 7. A flange 8 is formed on the ceramic outer vessel 7. By means of this flange 8, the outer vessel 7 is braced against the housing cover 4 by means of a clamping ring 9. For this purpose, the clamping ring 9 has a bolt collar 20, by means of which the clamping ring 9 is screwed to the housing cover 4. The flange 8 on the outer vessel 7 is fastened to the housing cover 4 by screwing the bolt ring 20. The metal inner vessel 6 is welded to the housing cover 4 and thus forms a unit with the housing cover 4. A weld is applied around the opening of the inner vessel 6 and thus sealingly secures the housing cover 4 to the inner vessel 6. A flat seal 14 is arranged between the housing cover 4 and the flange 8 of the outer vessel 7, which flat seal seals the gap between the inner vessel 6 and the outer vessel 7 against the housing cover 4. For this purpose, the clamping ring 9 exerts a pretension on the flat seal 14 and ensures a high sealing effect. By fastening the outer vessel 7 to the housing cover 4 by clamping with a clamping ring 9, a gap pot 5 can be realized very simply, which has a metal inner vessel 6 and an outer vessel 7 made of ceramic material, which is placed over the metal inner vessel. The sealing is achieved by means of a flat seal 14 between the housing cover 4 and the outer vessel 7, which results in a reliable seal even in the event of temperature fluctuations which have different effects on the material of the outer vessel 7 and the inner vessel 6. The inner vessel 6 is preferably formed of a nickel-based alloy. This may be, for example, alloy 718, Inconel 718 or Nicofer5219Nb or Hastelloy C-4. The outer can 7 is preferably formed of zirconia (ZrO 2). As can be further seen from fig. 1, the rotor 10 of the magnetic coupling 10, 11 is supported in the gap pot 5 by means of a pump support 12. The pump support 12 is connected to the housing cover 4. By fastening the pump bearing 12 to the housing cover 4, a particularly compact design of the pump shown here can be achieved, since the pump bearing 12 is arranged in the gap pot 5 of the double-shell embodiment. The pump shaft 21, which transmits the rotational movement from the rotor 10 to the impeller 2, can thereby be made particularly short. This compact design makes it possible to compactly design a magnetic coupling pump 1 equipped with a double-shell gap can 5 in order to meet the chemical standard DIN/ISO 2858. The pump 1 shown is therefore particularly suitable for increasing the operational reliability in a production plant of the chemical industry. The pump 1 shown here can be used in a compatible manner as a replacement for other pumps, for example pumps with a single-shell gap can. The pump support 12 is fastened to the housing cover 4 by means of a screw connection 13. This allows the pump support device 12 to be assembled very simply. During maintenance work, the pump support device 12 can also be separated from the gap pot 5 very simply. Fig. 1 also shows that a pressure monitoring line 15 is inserted into the housing cover 4. The pressure monitoring line 15 opens into an intermediate space 16 formed between the inner tank 6 and the outer tank 7. The pressure exerted in the intermediate space 16 can be monitored by means of a pressure monitoring line 15 which opens into the intermediate space 16. Thus, it is possible to simply determine the unsealing or the breakage of the inner and outer tanks 6 and 7. A pressure sensor 17, which enables automatic pressure monitoring, can be connected to the pressure monitoring line 15 for pressure monitoring of the intermediate space 16. For sealing the pump 1, a further flat seal 18 is arranged between the housing cover 4 and the pump housing 3. The housing cover 4 is pressed against the pump housing 3 by its fastening 19 and thus a pretension is applied to the flat seal 18 arranged between the pump housing 3 and the housing cover 4. The pump housing 3 can thereby be reliably sealed.

Fig. 2 shows the gap pot 5 according to fig. 1 in a perspective view. It can be seen that the clamping ring 9 is pretensioned by the bolt collar 20, with which the flange 8 of the outer vessel 7 is clamped against the housing cover 4. A pressure transmission line 22, which is connected to the pressure sensor 17, leads laterally from the housing cover 4. The pressure transmission line 22 opens into the intermediate space 16 between the inner tank 6 and the outer tank 7 via a pressure monitoring line 15 (fig. 1) formed in the housing cover 4. This enables the pressure monitoring of the intermediate space 16.

In fig. 3, a sectional view of the gap pot 5 according to fig. 2 is shown in section. As can be seen from this illustration, the clamping ring 9 clamps the flange 8 of the outer vessel 7 against the housing cover 4, which is welded to the inner vessel 6 by means of the welded connection 23. The clamping ring 9 exerts a pretension on a flat seal 14 arranged between the housing cover 4 and the outer vessel 7. The clamping ring 9 is pretensioned by the tightening of the bolt ring 20.

Fig. 4 shows another view of the gap can 5. In a side view, a part is shown in section so that the pressure monitoring line 15 formed in the housing cover 4 can be seen.

This cut-away area is shown in more detail in fig. 5. It can be seen how the pressure monitoring line 15 opens into the intermediate space 16 between the inner tank 6 and the outer tank 7. This enables the pressure monitoring of the intermediate space 16 between the inner tank 6 and the outer tank 7 of the gap tank 5. In this detail view, it is also clear that a flat seal 14 is arranged between the flange 8 of the outer vessel 7 and the housing cover 4, to which flat seal a clamping ring 9 is applied by tightening via a threaded ring 20. The weld 23 between the inner vessel 6 and the housing cover 4 can also be clearly seen in fig. 5. It can be seen that the weld seam 23 is configured as a fillet weld seam and is therefore easy to manufacture. In addition, the fillet weld provides a reliable seal and fastening between the housing cover 4 and the inner vessel 6.

List of reference numerals

1 Pump

2 impeller

3 Pump case

4 casing cover

5 gap pot

6 inner tank

7 outer pot

8 Flange

9 clamping ring

10 drive device

11 rotor

12 pump support device

13 screw connection

14 first flat seal

15 pressure monitoring pipeline

16 intermediate space

17 pressure sensor

18 second flat seal

19 fastening part

20 bolt ring

21 pump shaft

22 pressure transfer line

23 welded connection