Pump comprising a fixing device

Abstract

The present invention relates to a pump (10) comprising at least one fastening device (22) for attaching the pump (10) to an external stable element (24), the pump (10) comprising, for fastening the pump (10) with the fastening device (22), at least one opening (26) in a component of the pump (10) which faces the external stable element (24) when the pump (10) is in an upright position on the external stable element (24), wherein the fastening device (22) comprises at least one threaded fastener (28), a first elastic element (30) and a second elastic element (32), wherein the first and second elastic elements (30, 32) have an opening (34) for the threaded fastener (28), wherein the threaded fastener (28) is inserted through the openings (26, 34) of the first elastic element (30), the second elastic element (32) and the component of the pump (10) which includes the opening (26),and wherein the pump component (10) which includes the opening (26) is sandwiched between the first elastic member (30) and the second elastic member (32). Abstract Figure: Figure No. 1,

Description

Title of the invention: Pump comprising a fixing device Technical field

[0001] The invention relates to a pump comprising a fixing device for attaching the pump to an external stable element. Background to the invention

[0002] Pumps are known in the prior art and are generally used to move fluids such as liquids and gases by mechanical action. So-called centrifugal pumps are used to transport fluids by converting rotational kinetic energy into hydrodynamic energy of the fluid flow. The rotational energy usually comes from a motor or electric motor. Centrifugal pumps are commonly used for pumping water, wastewater, agriculture, petroleum, and petrochemical applications. Centrifugal pumps are often chosen for their high flow capacity, compatibility with abrasive solutions, mixing potential, as well as their relatively simple engineering.

[0003] The mechanical action of the pump can cause vibrations of the pump and its components. In many cases, these vibrations are undesirable because they waste energy, create unwanted noise, put stress on the material and can weaken it. The weakening of the material can in turn cause the pump to fail and / or make it unsafe to use.

[0004] It is therefore necessary to reduce vibrations in pumps and / or to reduce the impact of vibrations. Description of the invention

[0005] In view of this situation, the present invention aims to provide a safer pump and / or a pump having a longer service life.

[0006] Accordingly, the object is achieved by a pump comprising at least one fastening device for attaching the pump to an external stable element, the pump comprising, for attaching the pump with the fastening device, at least one opening in a component of the pump which faces the external stable element when the pump is in an upright position on the external stable element, wherein the fastening device comprises at least one threaded fastener, a first elastic element and a second elastic element, wherein the first and second elastic elements have an opening for the threaded fastener, the threaded fastener being inserted through the openings of the first elastic element, the second elastic element and the component of the pump which has the opening, and the component of the pump which has the opening being sandwiched between the first elastic element and the second elastic element.

[0007] Preferably, the pump is configured to transport a fluid by converting mechanical energy of the pump into hydraulic energy of the fluid.

[0008] One aspect of the proposed solution is to provide a pump with a fastening device comprising the first elastic element, the second elastic element and the threaded fastener, and to arrange the fastening device such that the component of the pump which comprises the opening and which faces the external stable element when the pump is in an upright position on the external stable element is sandwiched between the first elastic element and the second elastic element. This preferably means that the connection of the pump to the external stable element via the threaded fastener inserted into the openings is not a rigid connection, but rather an elastic connection via the two elastic elements.

[0009] Sandwiching the pump component that includes the opening between the first elastic member and the second elastic member has the effect of shifting high vibration energy to a lower frequency and damping the amplitude. This prevents material weakening and improves pump safety. In addition, since the pump experiences less vibration, expansion and contraction stresses on the piping attached to the pump are reduced. Since material weakening is reduced, the pump has a longer service life.

[0010] In the context of this application, the external stable element is an element to which the pump is attached. Preferably, the external stable element has a much higher mass than the pump itself, so that the displacement of the external stable element under the effect of vibrations of the pump is negligible. The external stable element may, for example, be the floor itself or a mounting platform rigidly fixed to the floor.

[0011] Preferably, the pump is attached to the external stable element by securing the threaded fastener in the external stable element and / or on the external stable element. Preferably, the threaded fastener is configured as a screw, which can engage in the external stable element. Alternatively, the threaded fastener is preferably configured as a bolt, which can be secured to the external stable element using a nut.

[0012] In the case where the pump is attached to the external stable element, one of the first or second elastic elements is preferably located below the pump element which includes the opening and the other elastic element is preferably located above the pump element which includes the opening. The terms "above" and "below" are understood with respect to the direction of the gravitational force. In the following, the elastic element located above the pump element which includes the opening is referred to as the first elastic element, while the elastic element located below the pump element that includes the opening is called the second elastic element. Preferably, the second elastic element is located between the pump element that includes the opening and the external stable element.

[0013] According to a preferred embodiment of the invention, the pump element which comprises the opening is in contact with the first elastic element and the second elastic element. In other words, the pump element which comprises the opening is preferably not only sandwiched between the two elastic elements, but also comes into contact with both elastic elements. In other words, there is preferably no additional element between the pump element which comprises the opening and the first elastic element, nor between the pump element which comprises the opening and the second elastic element. This simplifies the fixing device and reduces costs.

[0014] According to another preferred embodiment of the invention, the fastening device further comprises a washer, preferably a rigid and / or metallic washer, and wherein the washer is sandwiched between a head of the threaded fastener and one of the first or second elastic elements. Since the fastening of the pump to the external stable element is preferably carried out by the threaded fastener, an additional washer - preferably a rigid washer, made of a rigid material such as metal - allows the load of the threaded fastener to be distributed more evenly on the elastic element and, in particular, on the first elastic element. Furthermore, the washer allows the use of threaded fasteners with heads of different shapes.

[0015] According to another preferred embodiment of the invention, the washer is in contact with the head of the threaded fastener and one of the first or second elastic elements. In other words, there is preferably no additional element between the washer and the head of the threaded fastener, nor between the washer and the first elastic element.

[0016] According to another preferred embodiment of the invention, the first or second elastic element is configured as an elastic washer. The elastic washer is preferably in contact with the rigid and / or metallic washer and the pump component that includes the opening. Preferably, the first elastic element - i.e. the elastic element located above the pump component that includes the opening - is configured as an elastic washer. This has the advantage of requiring only a small support surface for the elastic washer on the pump component that includes the opening.

[0017] According to another preferred embodiment of the invention, the component of the pump which faces the external stable element when the pump is in a vertical position comprises several openings and the pump comprises a fixing device for each opening. In other words, it is preferable that the pump is fixed to the external stable element at several fixing points. Thus, the pump preferably comprises for each opening a threaded fixing, a first elastic element - preferably the elastic washer - and preferably a rigid washer.

[0018] In this context and with regard to the second elastic element, it is possible for the pump to comprise a second elastic element for each opening. It is also possible for the pump to comprise a second elastic element for several openings - and preferably a second elastic element for all openings of the pump component that faces the external stable element when the pump is in an upright position. In the first variant, the second elastic element preferably comprises a single opening. In the second variant, the second elastic element comprises several openings, in particular preferably as many openings as the pump component that faces the external stable element.

[0019] As regards the second elastic element, it is generally possible that it is also configured as an elastic washer. However, according to a preferred embodiment of the invention, one of the first or second elastic elements - preferably the second elastic element - is configured as an elastic plate and preferably comes into contact with the external stable element, when the pump is in a vertical position on the external stable element. The attachment of the pump to the external stable element is thus particularly easy.

[0020] In this context and according to another preferred embodiment of the invention, the elastic plate has the same shape as a contact area of ​​the pump component which comprises the opening towards the external stable element. Preferably, the elastic plate has several openings. Thus, preferably, the pump is not supported point by point by multiple second elastic elements at the attachment points, but the entire contact area is supported by the second elastic element. Furthermore, having one elastic plate in the shape of the contact area instead of several second elastic elements makes it easier to attach the pump to the external stable element, since the alignment of the pump and in particular the openings in the pump component to the second elastic element is simplified.

[0021] As regards the material of the elastic elements, it is preferred that the first and / or the second elastic element is made of a polymer, a thermoplastic elastomer, a natural or synthetic rubber, EPDM, PET, silicone rubber, polyamide, PE, IIR, nitrile rubber, vulcanized rubber and / or mixtures thereof.

[0022] Thermoplastic elastomers are a type of material that behaves like an elastomer at room temperature, but can be processed at elevated temperatures like a thermoplastic. Thermoplastic elastomers thus have the ability to be stretched to moderate elongations and, after removal of the constraint, to essentially return to their original shape. They can further be processed as a molten material at high temperature. The use of thermoplastic elastomers for the first and / or second elastic elements makes the production of the first and / or second elastic element easier and more cost-effective.

[0023] Natural rubber, also called latex or rubber, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds.

[0024] A synthetic rubber is an artificial elastomer. Synthetic rubbers are polymers synthesized from petroleum by-products. Preferred synthetic rubbers are styrene-butadiene rubber (SBR), EPDM, nitrile or silicone rubber.

[0025] EPDM, also known as EPDM rubber (ethylene-propylene-diene monomer rubber) is a terpolymer of ethylene, propylene and a third diene. The third diene is preferably ethylidene norbornene (ENB), dicyclopentadiene (DCPD) and / or vinyl norbornene (VNB).

[0026] PET - short for polyethylene terephthalate - is a polyester composed of repeating units (Cio H8 O4).

[0027] Silicone rubber is a polysiloxane, i.e. a polymer composed of siloxane -R2 Si-O-SiR2 -, where R is an organic group. Methyl-vinyl silicone rubber - or VMQ for short - is particularly preferred. This is a silicone rubber in which some of the organic groups are methyl groups and others are vinyl groups.

[0028] Polyamide is a polymer whose repeating units are linked by amide bonds.

[0029] PE, short for polyethylene (IUP AC name: polyethene or poly(methylene)), is a polymer with the chemical formula (C2 H4)n. PE is usually a blend of similar ethylene polymers, with different values ​​of n.

[0030] IIR, the abbreviation for isobutylene isoprene rubber, is also called butyl rubber and is a copolymer of isobutylene and isoprene, preferably 95% to 99% isobutylene and 1% to 5% isoprene.

[0031] Preferably, the first and / or second elastic member are made of nitrile rubber and / or vulcanized rubber. Nitrile rubber, also known as nitrile-butadiene rubber (NBR), is a synthetic rubber derived from acrylonitrile (ACN) and butadiene. Other rubbers cured by a vulcanization process may also be used for the first and / or second elastic member.

[0032] The first and / or second elastic element may also comprise a porous material, i.e., a material containing many small gas bubbles. This can improve vibration damping.

[0033] It has been found that the hardness of the material of the first and / or second elastic element strongly affects the effect of the fixing arrangement. In this regard and according to another preferred embodiment, the shore hardness of the first and / or second elastic element is between 50 and 80, preferably between 60 and 70, and more preferably 70 + 5 according to ASTM D2240 type A.

[0034] It is not only the hardness of the material that can affect the vibrations, but also the thickness of the first and second elastic element. It is also preferable that the thickness of the first and / or second elastic element is between 3 and 8 mm. Preferably, the thickness of the first elastic element - preferably the elastic washer - is between 3 and 6 mm, preferably between 3 and 4 mm. Preferably, the thickness of the second elastic element - preferably the elastic plate - is between 4 and 8 mm, preferably between 6 and 8 mm.

[0035] Preferably, the thickness of the first and / or second elastic element and the Shore hardness of the first and / or second elastic element are adapted to the mass of the pump and / or to the contact surface of the pump element which comprises the opening towards the external stable element. It has been found that there is an interaction between the hardness of the first and / or second elastic element, the thickness of the first and / or second elastic element, the contact area of ​​the pump element which comprises the opening towards the external stable element and therefore also the area of ​​the second elastic element configured as an elastic plate, and the mass of the pump.

[0036] According to another preferred embodiment of the invention, the fastening device further comprises a rigid sleeve for limiting the torque of the threaded fastener. Preferably, the rigid sleeve is a metal or plastic sleeve. Preferably, the rigid sleeve is arranged around the threaded fastener and, preferably, around the shaft of the threaded fastener. Preferably, the rigid sleeve is placed in the opening of the pump component that faces the stable external element. Preferably, the rigid sleeve extends over a threaded fastener length corresponding to the sum of the thicknesses of the first elastic element, the second elastic element and the pump component comprising the opening and facing the stable external element. The rigid sleeve is further configured as a pipe. It has been found that the torque applied by the threaded fastener influences the properties of the first and / or the second elastic element.

[0037] Preferably, the torque applied by the threaded fastener is adapted to the thickness of the first and / or second elastic element and to the Shore hardness of the first and / or second elastic element. Preferably, the torque applied by the threaded fastener is between 5 and 10 Nm, and preferably between 8 and 10 Nm. Limiting the torque to these values ​​is particularly easy to achieve with the rigid sleeve.

[0038] In general, it is possible for the pump element that faces the external stable element when the pump is in an upright position on the external stable element and that includes the opening to be part of a pump housing or to be rigidly attached to the pump housing.

[0039] In this regard and according to another preferred embodiment of the invention, the pump component which comprises the opening is a pump plate. The attachment of the pump to the external stable element is thus particularly easy. The plate can be integrated into the pump body or be rigidly connected to the pump body. In this context, the second elastic element, configured as an elastic plate, preferably has the same shape as the pump plate.

[0040] Preferably, the pump comprises a pump body forming a pump chamber, wherein the pump chamber comprises a suction opening for drawing fluid into the pump chamber and an outlet opening for releasing fluid from the pump chamber, and wherein the component of the pump that faces the external stable member when the pump is in an upright position on the external stable member is part of the pump body or is rigidly joined to the pump body.

[0041] Another preferred solution is that the pump comprises a motor with a motor housing, and wherein the component of the pump that faces the external stable member when the pump is in an upright position on the external stable member is part of the motor housing or is rigidly connected to the motor housing.

[0042] According to another preferred embodiment of the invention, the pump is configured as a centrifugal pump, and preferably as a vertical pump, and particularly preferably as a stand-alone vertical pump.

[0043] Centrifugal pumps have the advantage of being able to provide high flow rates, being compatible with abrasive solutions, having a high mixing potential and being relatively simple to design. Centrifugal pumps transport fluid by converting rotational kinetic energy into hydrodynamic energy of the fluid flow. The rotational energy is preferably provided by the motor to rotate an impeller located in the pump chamber. The fluid preferably enters the rapidly rotating impeller along its axis and is expelled by centrifugal force along its circumference through the tips of the impeller blades. This action of the impeller increases the velocity and pressure of the fluid and directs it towards the outlet.

[0044] Vertical pumps are generally used to extract fluid from a reservoir or deep well. Preferably, the pump motor is mounted above- above the pump body.

[0045] In particular for self-contained vertical pumps, it has been found that the shore hardness of the first and / or second elastic element of 50 to 80, preferably 60 to 70, and more preferably 70 + 5 according to ASTM D2240 type A, the thickness of the first elastic element - preferably the elastic washer - of 3 mm to 6 mm, preferably 3 mm to 4 mm, the thickness of the second elastic element - preferably the elastic plate of 4 mm to 8 mm, preferably 6 mm to 8 mm, and the limitation of the torque of 5 Nm to 10 Nm and preferably 8 Nm to 10 Nm, are particularly advantageous. However, the hardness and thickness of the first and / or second elastic element may vary depending on the mass of the pump. Brief description of the drawings

[0046] In the following, the invention is explained in more detail with reference to the accompanying drawings which are based on preferred embodiments by way of example.

[0047] In the drawings:

[0048] [Fig.l] [Fig.l] shows an exploded view of a pump comprising a fixing device, according to a preferred embodiment of the invention;

[0049] [Fig.2] [Fig.2] shows a perspective view of the pump according to the operating mode lization of [Fig.l];

[0050] [Fig.3] [Fig.3] shows a sectional view along line AA of [Fig.2]; and

[0051] [Fig.4] [Fig.4] shows a sectional view along line AA according to another preferred embodiment of the invention. Detailed description of the embodiments

[0052] [Fig.l] shows a pump 10 in an exploded view according to a preferred embodiment of the invention and [Fig.2] shows the same pump in a perspective view.

[0053] The pump 10, designed as a self-contained vertical pump, is adapted to transport a fluid by converting the mechanical energy of the pump into hydraulic energy of the fluid. The pump 10 comprises a pump body 12 forming a pump chamber 14. The pump chamber 14 comprises a suction opening 16 for sucking the fluid into the pump chamber 14 and an outlet opening 18 for releasing the fluid from the pump chamber 14. The pump body 12 is rigidly joined to a plate 20 of the pump 10. The plate 20 is oriented towards the floor when the pump 10 is in a vertical position on the floor.

[0054] The pump 10 comprises a fixing device 22 for attaching the pump 10 to an external stable element 24 - in this case the floor. Furthermore, the plate 20 of the pump 10 comprises four openings 26, in each corner an opening 26 for fixing the pump 10 to the floor.

[0055] In this embodiment, the fastener 22 comprises a threaded fastener 28, a first elastic member 30 and a second elastic member 32. As can be seen in Figures 1 and 2, the first elastic member 30 is configured as a washer, while the second elastic member 32 is configured as an elastic plate. The first elastic member 30 and the second elastic member 32 are made of rubber and have a shore hardness of 70 according to ASTM D2240 Type A. The first elastic member 30 has a thickness of 3 mm and the second elastic member 32 has a thickness of 6 mm.

[0056] The first elastic element 30 and the second elastic element 32 have an opening 34 for the threaded attachment 28.

[0057] Furthermore, as can be seen in [Fig. 2], the threaded fastener 28 is inserted through the openings 34, 26 of the first elastic element 30, the second elastic element 32 and the plate 20. Since the second elastic element 32, i.e. the elastic plate, has the same shape as the contact area of ​​the plate 20, it also has four openings 34, corresponding to the openings 26 of the plate 20. The second elastic element 32 comes into contact with the floor 24 as well as with the plate 20 when the pump 10 is in a vertical position.

[0058] [Fig. 3] shows a sectional view along line AA of [Fig. 2]. As is particularly easy to recognize in [Fig. 3], the plate 20 is sandwiched between the first elastic element 30 and the second elastic element 32.

[0059] In this exemplary embodiment, the fastening device 22 further comprises a metal washer 36. The metal washer 36 is sandwiched between the head 38 of the threaded fastener 28 and the first elastic element 30 and comes into contact with the head 38 of the threaded fastener 28 and the first elastic element 30. Furthermore, the plate 20 is in contact with the first elastic element 30 and the second elastic element 32.

[0060] Furthermore, in this exemplary embodiment, the torque of the threaded fastener 28 of the fastening device 22 is limited to 8 Nm to 10 Nm. This is symbolized in [Fig.2] by the arrow 40.

[0061] [Fig.4] shows another sectional view along line AA of another mode of preferred embodiment of the invention. In this embodiment, compared to the embodiment illustrated in Figures 1 to 3, the fixing device 22 further comprises a rigid sleeve 42 for limiting the torque of the threaded fastener 28. The rigid sleeve 42 is arranged around a rod of the threaded fastener 28. The length of the sleeve 42 corresponds to the sum of the thicknesses of the first elastic element 30 - i.e. the elastic washer - of the second elastic element 32 - i.e. the elastic plate - and of the plate 20. Thus, the rigid sleeve 42 ends with the metal washer 36 at the top and with the floor 24 at the bottom.

[0062] The described model is only an example which can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a particular exemplary embodiment can be used independently or in combination with other features in any other embodiment. Any feature described for an exemplary embodiment of a particular category can also be used correspondingly in an embodiment of another category.

[0063] List of reference symbols

[0064] Pump 10

[0065] Pump body 12

[0066] pump chamber 14

[0067] suction opening 16

[0068] opening of the outlet orifice 18

[0069] plate 20

[0070] fixing device 22

[0071] external stable element, floor 24

[0072] openings of plate 26

[0073] threaded fixing 28

[0074] first elastic element 30

[0075] second elastic element 32

[0076] opening of the first and second elastic elements 34

[0077] metal washer 36

[0078] head of the threaded fastener 38

[0079] arrow, torque limitation symbol 40

[0080] sleeve 42

Claims

Claims

1. A pump (10) comprising at least one fastening device (22) for attaching the pump (10) to an external stable element (24), • the pump (10) comprising, for fastening the pump (10) with the fastening device (22), at least one opening (26) in a component of the pump (10) which faces the external stable element (24) when the pump (10) is in an upright position on the external stable element (24), • wherein the fastening device (22) comprises at least one threaded fastener (28), a first elastic element (30) and a second elastic element (32), • wherein the first and second elastic elements (30, 32) have an opening (34) for the threaded fastener (28), • wherein the threaded fastener (28) is inserted through the openings (26, 34) of the first elastic element (30), the second elastic element (32) and the component of the pump (10) which includes the opening (26),and • wherein the pump component (10) which includes the opening (26) is sandwiched between the first elastic element (30) and the second elastic element (32).,

2. Pump (10) according to the preceding claim, wherein the component of the pump (10) which comprises the opening (26) is in contact with the first elastic element (30) and the second elastic element (32).

3. A pump (10) according to any preceding claim, wherein the fastener (22) further comprises a washer (36), preferably a rigid washer and / or a metal washer, and wherein the washer (36) is sandwiched between a head (38) of the threaded fastener (28) and one of the first or second resilient members (30,32).

4. Pump (10) according to one of the preceding claims, wherein one of the first or second elastic elements (30) is configured as an elastic washer.

5. Pump (10) according to one of the preceding claims, in which the component of the pump (10) which faces the external stable element (24) when the pump (10) is in an upright position comprises a plurality of openings (26) and wherein the pump (10) comprises a fixing device (22) for each opening (26).

6. Pump (10) according to one of the preceding claims, wherein one of the first or second elastic elements (32) is configured as an elastic plate, and preferably contacts the external stable element (24), when the pump (10) is in a vertical position on the external stable element (24).

7. Pump (10) according to the preceding claim, wherein the elastic plate has the same shape as a contact area of ​​the component of the pump (10) which comprises the opening (26) with the external stable element (24).

8. A pump (10) according to any preceding claim, wherein the first and / or second resilient member (30, 32) comprises a polymer, a thermoplastic elastomer, EPDM, PET, silicone rubber, polyamide, PE, IIR, nitrile rubber, vulcanized rubber and / or mixtures thereof; and / or wherein the shore hardness of the first and / or second resilient member (30, 32) is between 50 and 80, preferably between 60 and 70, according to ASTM D2240 Type A.

9. A pump (10) according to any preceding claim, wherein the fastening device (22) further comprises a rigid sleeve (42) for limiting the torque (40) of the threaded fastener (28).

10. A pump (10) according to any preceding claim, wherein the component of the pump (10) which comprises the opening (26) is a plate (20) of the pump (10), and / or the pump (10) is configured as a centrifugal pump, preferably as a vertical pump and, more preferably, as a stand-alone vertical pump.