ES2932751T3 - Bomb - Google Patents

Abstract

The invention relates to a pump with a system of evacuation channels (6) by means of which a rotor chamber (5) is washed, in which a rotor (4.1) of the drive motor (4) is mounted in such a way rotating to circulate a supply element (3.3) of a pump device (3) to drive. (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Bomb

The invention relates to a pump for hygiene sensitive applications and to a method for operating a pump.

Pumps for hygiene sensitive applications are already known. DE 102019 102073 A1 describes a gear pump in which a partial volume flow of the conveyed fluid is diverted into a rotor space on the pressure side in order to wash it with the fluid.

A significant drawback of the known pump is that the flushing of the rotor space is insufficient and indefinite.

Document EP 3115609 A1 describes a self-cleaning pump in which the medium used to flush the rotor space is taken from the suction side of the pump, fed via a riser pipe in the area of the rotor axis of rotation next to rotor and, after flowing around the rotor at the rotor underside, is returned to the suction side of the pump to be pressurized by a main pump medium and fed to the pressure side of the pump.

US 3,986,797 A describes a magnetic pump in which part of a magnetic coupling is passed through by a flushing medium.

Proceeding from this, it is the object of the invention to specify a pump that allows an improved washing of the rotor space while at the same time being highly efficient.

The object is solved by a pump having the features of independent claim 1. A method of operating a pump is the subject of independent claim 13. Preferred embodiments are the subject of the dependent claims.

According to a first aspect, the invention relates to a pump for transporting a fluid, in particular a liquid. The pump comprises a transport channel through which a fluid can be delivered. The transport channel has a pump inlet and a pump outlet. A pumping device is provided to transport the fluid between the inlet of the pump and the outlet of the pump. The pumping device has a suction side and a pressure side. The pumping device consists of two rotary conveying elements that fit together and by means of which a fluid flow is generated.

In addition, a drive motor is provided, which is coupled to the at least one transport element in order to rotate it. The drive motor has a rotor and a stator. The rotor of the drive motor is provided in a rotor space that is closed off by fluid from the environment.

The pump also features a flushing channel system for flushing the rotor space with the conveyed fluid, the flushing channel system comprising an inlet to the rotor space and an outlet to the rotor space. The flushing channel system is designed in such a way that the entire fluid flow is conveyed from the pressure side of the pumping device to the inlet of the rotor space, which is arranged on an upper side of the rotor space leading away of the pumping device and, after flowing around the rotor, is transported through the outlet of the rotor space to the outlet of the pump. The outlet of the rotor space is arranged on an underside of the rotor space facing the pumping device.

The technical advantage of the pump is that by diverting the fluid flow from the pressure side of the pump to the top of the rotor and placing the outlet of the rotor space at the bottom of the rotor space, i.e. in the opposite side of the rotor, an effective washing of the rotor space is achieved, which leads to better hygienic conditions. Furthermore, the Applicant has recognized that due to the rotational movement of the rotor, the fluid is transported outwards from the inlet of the rotor space due to centrifugal force, which leads to a higher efficiency of the pump and also to a better cleaning effect in the rotor gap.

According to an exemplary embodiment, a first section of the washing channel of the washing line system runs along the axis of rotation of the rotor, in particular in such a way that the first section of the washing line is in the form congruent with the axis of rotation of the rotor. As a result, the fluid flow can be centrally guided through the rotor to allow the fluid to exit at the top of the rotor.

According to an exemplary embodiment, the first section of the washing channel is tubular with a circular outer cross section, and the first section of the washing channel forms a bearing shaft for the rotor. In particular, the first section of the washing channel is arranged in the pump in a rotationally fixed manner, ie it does not rotate with the rotor of the drive motor and thus forms a fixed axis of rotation for the rotor.

According to an exemplary embodiment, at least one transport element is designed at least in sections as a hollow shaft and is rotatably mounted in the first section of the washing channel of the washing channel system. As a result, the transport element can be slid over the first section of the channel of washing and turning around this first section of the washing channel. Preferably, a plain bearing is formed between the transport element and the first section of the washing channel. The transport element forms a first journal bearing part on the inside and a second journal bearing part on the outside of the first section of the washing channel. The pump can be designed in such a way that a liquid film (formed from the pumped liquid) is formed between the transport element and the first section of the washing channel.

According to an exemplary embodiment, the hollow shaft of the transport element is coupled to the rotor in order to introduce a torque of the drive motor into the transport element.

Preferably, the hollow shaft protrudes into the rotor at least in sections, in particular the hollow shaft penetrates completely or essentially completely into the rotor. In this way, the hollow shaft forms a plain bearing with a large surface area between the transport element and the first section of the washing channel, which serves as a support point for the rotor.

According to an exemplary embodiment, the rotor is pushed and/or pressed against the hollow shaft. In this way, the torque can be introduced safely and technically easily into the transport element.

According to an exemplary embodiment, the inlet of the rotor space is provided centrally in the region of the upper side of the rotor facing away from the pump device. As a result, the fluid is introduced into the rotor space above the rotor and has to flow downward through the outer surfaces of the rotor to reach the outlet of the rotor space.

According to an exemplary embodiment, the rotor space is designed in such a way that the fluid supplied to the rotor space through the rotor space inlet is deflected radially outward in the rotor space relative to the axis of rotation of the rotor and is discharged downward through the outer surface of the rotor in the direction of the exit of the rotor space. Due to this flow around the rotor, a sufficiently good flushing of the rotor space without dead spaces is achieved. Also, this flow around the rotor improves the efficiency of the pump due to its rotating motion.

According to the invention, the flushing channel system is designed in such a way that the entire flow of fluid carried by the pumping device is delivered to the inlet of the rotor space. This has the technical advantage that a large volume flow is conveyed through the rotor space, which significantly improves the flushing effect.

The fluid is led from the pressure side of the pumping device through a multi-angled flush channel section along the axis of rotation of the rotor, is introduced into the rotor space above the rotor and, after flowing around the rotor, it is fed to the outlet of the pump through the outlet of the rotor space. In other words, the flushing channel system forms a section of the conveying channel between the pump inlet and the pump outlet, through which the entire flow of fluid conveyed by the pumping device is conducted with the purpose of in order to evacuate the space of the rotor sufficiently well and to achieve the lowest possible pressure drop throughout the system of washing channels. According to an exemplary embodiment, the transport elements are formed by two toothed wheels. This makes it possible to achieve an effective pumping effect.

According to an exemplary embodiment, a hood-like cover is provided, which encloses the rotor space at the top and around the circumference and delimits it in a fluid-tight manner from the surroundings. In this way, a fluid-tight rotor housing can be achieved in a simple technical way, so that it can be rinsed without any fluid escaping.

According to an exemplary embodiment, the stator of the drive motor is arranged circumferentially around the hood-like cover. Therefore, the drive motor extends beyond the cover, that is, a first part, namely the rotor, is provided inside the cover and a second part, namely the stator, is provided outside. the cover. According to another aspect, the invention relates to a method for operating a pump. The pump includes a transport channel through which a fluid can be delivered, the transport channel having a pump inlet and a pump outlet. Between the pump inlet and the pump outlet, there is a pump device for supplying the fluid, which has a suction side and a pressure side. The pumping device has two rotating conveying elements that engage with each other and by means of which a fluid flow is generated. The transport elements are driven by a drive motor which is motorly coupled to the at least one transport element in order to rotate it. The drive motor has a rotor and a stator, the rotor of the drive motor being arranged in a rotor space that is fluidly sealed from the environment. The rotor space is washed with the fluid transported through a system of washing channels. The flushing channel system comprises a rotor space inlet and a rotor space outlet, wherein the fluid flow is conveyed from the pressure side of the pumping device to the rotor space inlet, which is arranged in an upper side of the rotor space facing away from the pumping device and, after flowing around the rotor, is conveyed through the rotor space outlet to the pump outlet, the space outlet being arranged of the rotor on an underside of the rotor space facing the pumping device.

The technical advantage of the process is that by diverting the fluid flow from the pressure side of the pump to the top of the rotor and placing the outlet of the rotor space at the bottom of the rotor space, i.e. on the side opposite of the rotor, an effective washing of the rotor space is achieved, which leads to better hygienic conditions. Furthermore, the Applicant has recognized that due to the rotational movement of the rotor, the fluid is transported outwards from the inlet of the rotor space due to centrifugal force, which leads to a higher efficiency of the pump and also to a better cleaning effect in the rotor gap.

According to an exemplary embodiment of the method, the fluid for washing the rotor space is conveyed along the axis of rotation of the rotor to an upper side of the rotor space which is remote from the pumping device and, after flowing around of the rotor along the top of the rotor and the peripheral surface of the rotor, it is discharged at the outlet of the rotor space. Due to this flow around the rotor, a sufficiently good flushing of the rotor space without dead spaces is achieved.

According to the invention, the entire flow of fluid delivered by the pump device is introduced from the pressure side of the pump device through a section of the wash channel with multiple angles along the axis of rotation of the rotor by above the rotor in the rotor space and, after flowing around the rotor, is fed to the pump outlet through the rotor space outlet. As a result, the rotor space can be flushed sufficiently well and the lowest possible pressure drop across the flush channel system can be achieved.

Within the meaning of the invention, the expressions "approximately", "substantially" or "around" mean deviations from the exact value in each case by /- 10%, preferably by /- 5% and/or deviations in the form of changes which are negligible for the function.

Other developments, advantages and possible applications of the invention also result from the following description of exemplary embodiments and from the figures.

The invention is explained in more detail below by means of a figure of exemplary embodiments. The figure shows an example of a sectional view of a pump 1 with a flushing channel system 6 for sweeping a rotor space 5. The pump 1 can be used in particular in hygiene sensitive applications with a hermetic sealing requirement. The pump 1 can be, in particular, a coffee machine pump, ie it can be provided for use in a machine that prepares a coffee drink, in particular a fully automatic coffee machine.

The pump 1 includes a pumping device 3 that is driven by a drive motor 4. The pump device 3 comprises a pump inlet 2.1 and a pump outlet 2.2, a pump channel 2 running between the pump inlet 2.1 and a pump outlet 2.2, in which the pump device 3 supplies a fluid, in particular a liquid (indicated by the arrows). For conveying the fluid, two interlocking and rotating conveying elements 3.3 are provided, which rotate in opposite directions and thus generate a fluid flow through the pumping channel 2. The conveying elements 3.3 can be formed, for example, by gears, so that the pump 1 is a gear pump.

To drive the conveying elements 3.3, a drive 4 is provided comprising a rotor 4.1 and a stator 4.2. The rotor 4.1 of the drive 4 is coupled to one of the conveying elements 3.3 in order to drive this conveying element 3.3 in rotation. The other transport element 3.3 is also driven by the meshing of the transport elements 3.3, so that the transport elements 3.3 rotate in opposite directions.

The pump 1 is constructed essentially as a sandwich and consists of a first lower pump part 1.1, a second middle pump part 1.2 and a third upper pump part 1.3, the second pump part 1.2 being arranged between the first and third part 1.1, 1.3 of the bomb. The first part 1.1 of the pump comprises the pumping device 3 with the conveying elements 3.3, which are configured, for example, as gear wheels, by means of which the fluid is sucked in or pressurized. The pump inlet 2.1 and the pump outlet 2.2 are preferably also provided in the first part 1.1 of the pump.

The second part 1.2 of the pump is designed as a separating device. It is essentially plate-shaped and separates the first pump part 1.1 from the third pump part 1.3. The second pump part 1.2 is fluidtightly connected to the first pump part 1.1 by means of a seal 8. The third pump part 1.3 comprises the drive motor 4, which is provided to drive the pumping device 3 by means of a motor. The third pump part 1.3 has a cover 7, which is designed as a hood and is connected to the second pump part 1.2 in a fluid-tight manner by means of a gasket 9. The cover 7 encloses together with the second part 1.2 of the pump a rotor space 5 in which the rotor 4.1 of the drive motor 4 is housed. The rotor space 5 is designed to be fluid-tight with respect to the environment and is designed to allow the fluid delivered by the pumping device 3 to flow through it to flush the rotor space 5. The rotor 4.1 can comprise one or more permanent magnets.

The stator 4.2 is provided circumferentially around the cover 7. The stator 4.2 is thus arranged outside the space 5 of the rotor through which the fluid flows. The stator 4.2 can have several current-carrying windings or coils by means of which the rotor 4.1 can be rotated.

The pump hygiene concept, in particular the flushing concept for flushing the rotor space 5, is described in more detail below:

The pumping device 3 has a suction side 3.1 and a pressure side 3.2, both provided in the first part 1.1 of the pump. The suction side 3.1 is arranged upstream of the pair of conveying elements 3.3 viewed in the direction of fluid flow, the pressure side 3.2 is arranged after the pair of conveying elements 3.3 viewed in the direction of fluid flow.

In order to flush the rotor space 5, in the illustrated exemplary embodiment, the entire flow of fluid conveyed by the pumping device 5 is conducted through the rotor space 5. After leaving this rotor space 5, the fluid flow is conveyed to the outlet 2.2 of the pump. The path of the fluid is represented in the figure by the plurality of arrows.

In order to direct the flow of fluid through the space 5 of the rotor, the pump 1 has a system 6 of flushing channels. The flushing channel system 6 is designed in such a way that the fluid is conveyed from the pressure side 3.2 of the pumping device 3 to a rotor space inlet 6a which is provided in the upper part of the rotor space 5 . The fluid flow is then diverted in such a way that it flows along the upper part 4.1.1 of the rotor and the outer surface 4.1.3 of the rotor and exits through the outlet 6b of the rotor space, which is provided below the rotor. 4.1, in the direction of the outlet 2.2 of the pump. The flushing channel system 6 thus forms part of the pumping channel 2, since all the fluid delivered by the pumping device is conducted through the space 5 of the rotor, and not just a fraction of the fluid flow.

In more detail, the washing channel system 6 has a first section 6.1 of the washing channel. This first section 6.1 of the washing channel runs along the axis of rotation DA of the rotor 4.1, ie the central longitudinal axis of the first section 6.1 of the washing channel coincides with the axis of rotation DA of the rotor 4.1. The inlet 6a of the rotor space is formed by the free end of the first section 6.1 of the washing channel, which is arranged in the region of the upper side of the rotor space 5. In this way, the fluid can flow through the rotor 4.1 along its central vertical axis through the first centrally arranged washing channel section 6.1.

The first section 6.1 of the washing channel is straight and is preferably designed as a round tube. In this way, the first section 6.1 of the washing channel forms a fixed axis as a support point around which the rotor 4.1 of the drive motor 4 can rotate.

As can be seen in the figure, at least one transport element 3.3 has a hollow shaft 3.3.1. The transport element 3.3 has, for example, in a lower area a gear-shaped section from which the hollow shaft 3.3.1 protrudes upwards. For example, the gear-shaped section and the hollow shaft 3.3.1 are sections of a one-piece conveying element 3.3.

The conveying element 3.3, in particular the gear-shaped section and the hollow shaft 3.3.1, has an internal longitudinal bore which is adapted to the outer diameter of the first section 6.1 of the washing channel, so that the conveying element 3.3 transport can rotate around the first section 6.1 of the washing channel after it has been placed.

The conveying element 3.3, in particular the hollow shaft 3.3.1, has such a length that it protrudes through the second pump part 1.2 into the third pump part 1.3. The length of the hollow shaft 3.3.1 is preferably adapted to the length of the first section 6.1 of the washing channel in such a way that the hollow shaft 3.3.1 and the first section 6.1 of the washing channel end at the same height or essentially at the same height in the upper region. The first washing channel section 6.1 is preferably longer than the conveying element 3.3, so that the fluid is introduced into the first washing channel section 6.1 through a washing channel section that is already inclined several times below element 3.3 of transport. The fluid stream preferably flows through the conveying element 3.3 over its entire length.

In order to drive the transport element 3.3 by the drive motor 4, the rotor 4.1 is preferably connected to the hollow shaft 3.3.1. In particular, the rotor 4.1 has a central opening into which the hollow shaft 3.3.1 protrudes at least in sections. Preferably, the rotor 4.1 slides or presses on the hollow shaft 3.3.1. In this way, the driving force of the rotor 4.1 can be transferred to the transport element 3.3.

As described above, the inlet 6a of the rotor space is provided in the upper region of the rotor space 5 or in the region of the upper side 4.1.1 of the rotor.

In order to achieve the best possible flow through the rotor space 5 without dead spaces, the rotor space outlet 6b is provided in the lower region of the rotor space 5, ie below the rotor 4.1. Therefore, the fluid must flow around the rotor 4.1 from the rotor space inlet 6a provided in the upper region of the rotor space 5 to reach the rotor space outlet 6b.

In particular, the pump 1 is designed in such a way that the fluid is diverted radially outward from the inlet 6a of the rotor space, that is, the fluid flows radially outward from the center of the rotor 4.1 at its upper side 4.1.1 (ie radially relative to the axis of rotation DA of the rotor 4.1). Between the cover 7 and the upper side 4.1.1 of the rotor, a space is formed through which the fluid can flow.

Next, the fluid flow is diverted again by the cover 7 in such a way that the fluid flows downwards from the upper part 4.1.1 of the rotor through a space formed between the cover 7 and the outer surface 4.1.3 of the rotor. After flowing around the rotor 4.1, the fluid reaches the outlet 6b of the rotor space and from there leaves through another section of the washing channel to the outlet 2.2 of the pump.

The invention has been described above using exemplary embodiments. It goes without saying that numerous changes and modifications are possible without leaving the scope of protection defined by the patent claims.

List of reference signs

1 pump

1.1 first part of the bomb

1.2 second part of the bomb

1.3 third of the bomb

2 transport channel

2.1 pump inlet

2.2 pump outlet

3 pumping device

3.1 suction side

3.2 pressure side

3.3 transport element

3.3.1 hollow shaft

4 drive motor

4.1 rotor

4.1.1 upper side of the rotor

4.1.2 underside of rotor

4.1.3 outer surface of the rotor

4.2 stator

5 rotor space

6 channel washing system

6th rotor space inlet

6b rotor space outlet

6.1 first section of the washing channel

7 deck

8 board

9 board

DA axis of rotation

Claims (13)

1. Pump comprising: - a transport channel (2) through which a fluid can be transported, with a pump inlet (2.1) and a pump outlet (2.2), where between the pump inlet (2.1) and the outlet (2.2) ) of the pump a pumping device (3) is provided for conveying the fluid, which has a suction side (3.1) and a pressure side (3.2); - wherein the pumping device (3) has two rotating conveying elements (3.3) coupled together, by means of which a fluid flow is generated; - a drive motor (4) that is motorly coupled to at least one conveying element (3.3) in order to rotate it, wherein the drive motor (4) has a rotor (4.1) and a stator (4.2) , wherein the rotor (4.1) of the drive motor (4) is provided in a rotor space (5) that is fluid-sealed from the environment; - where the pump (1) has a system (6) of washing channels to wash the space (5) of the rotor with the transported fluid, where the system (6) of washing channels comprises an inlet (6a) of the rotor space and an exit (6b) from the rotor space; characterized because The flushing channel system (6) is designed in such a way that the fluid flow is conveyed from the pressure side (3.2) of the pumping device (3) to the inlet (6a) of the rotor space, which is arranged on an upper side of the rotor space (5) facing away from the pumping device (3) and, after flowing around the rotor (4.1), is conveyed through the outlet (6b) of the rotor space to the outlet ( 2.2) of the pump, wherein the outlet (6b) of the rotor space is arranged on an underside of the rotor space (5) in front of the pumping device (3), and where the system (6) of channels of flushing is designed in such a way that the entire flow of fluid carried by the pumping device (3) is introduced into the space (5) of the rotor on the pressure side (3.2) of the pumping device (3) through a section of the washing channel with multiple angles along the axis of rotation (DA) of the rotor above the rotor (4.1) and, after flowing to Around the rotor (4.1), it is fed to the outlet (2.2) of the pump through the outlet (6b) of the rotor space. Pump according to claim 1, characterized in that a first section (6.1) of the flushing channel of the flushing channel system (6) runs along the axis of rotation (DA) of the rotor (4.1) in such a way that the first section (6.1) of the washing channel is congruent with the axis of rotation (DA) of the rotor (4.1). Pump according to claim 2, characterized in that the first section (6.1) of the washing channel is tubular with a circular outer cross section and the first section (6.1) of the washing channel forms a supporting shaft of the rotor (4.1). ). Pump according to Claim 2 or 3, characterized in that at least one conveying element (3.3) is designed at least in sections as a hollow shaft (3.3.1) and is rotatably mounted in the first section (6.1). of the washing channel of the system (6) of washing channels. Pump according to claim 4, characterized in that the hollow shaft (3.3.1) of the conveying element (3.3) is coupled to the rotor (4.1) in order to transmit power from the drive motor (4) to the element ( 3.3) of transport. Pump according to claim 4 or 5, characterized in that the rotor (4.1) is plugged and/or pressed onto the hollow shaft (3.3.1). Pump according to one of the preceding claims, characterized in that the inlet (6a) of the rotor space is provided centrally in the region of the upper side (4.1.1) of the rotor that is remote from the pump device (3). Pump according to one of the preceding claims, characterized in that the rotor space (5) is designed in such a way that the fluid supplied to the rotor space (5) via the rotor space inlet (6a) is deflects radially outward in the space (5) of the rotor relative to the axis of rotation (DA) of the rotor (4.1) and through the outer surface (4.1.3) of the rotor downwards in the direction of the outlet (6b) of the rotor space. Pump according to one of the preceding claims, characterized in that the conveying elements (3.3) are two interlocking gear wheels. Pump according to one of the preceding claims, characterized in that a cover (7) in the form of a hood is provided, which encloses the rotor space (5) on the upper side and on the circumference and delimits it in a leaktight manner. fluids to the environment. Pump according to claim 10, characterized in that the stator (4.2) of the drive motor (4) is arranged circumferentially around the hood-like cover (7). 12. Procedure for operating a pump (1) comprising a transport channel (2) through which a fluid can be transported, wherein the transport channel (2) has a pump inlet (2.1) and an outlet ( 2.2) of the pump, wherein, between the inlet (2.1) of the pump and the outlet (2.2) of the pump, a pumping device (3) is provided for conveying the fluid, which has a suction side (3.1) and a pressure side (3.2), where the pumping device (3) has two rotating, interlocking conveying elements (3.3), by means of which a fluid flow is generated, a motor (4) being provided for drive that is motorly coupled to at least one transport element (3.3) to rotate it, where the drive motor (4) has a rotor (4.1) and a stator (4.2), where the rotor (4.1 ) of the drive motor (4) is provided in a space (5) of the rotor that is sealed to fluids from the environment, where the rotor space (5) is washed with the fluid transported through a system (6) of washing channels, wherein the system (6) of washing channels comprises an inlet (6a) of the rotor space and an outlet ( 6b) of the rotor space, wherein the fluid flow conveyed from the pressure side (3.2) of the pumping device is conveyed to the inlet (6a) of the rotor space, which is arranged at the far top of the device ( 3) from the rotor space (5) pumping and, once the flow has circulated around the rotor (4.1), it is transported through the outlet (6b) of the rotor space to the outlet (2.2) of the pump , wherein the outlet (6b) of the rotor space is arranged on an underside of the rotor space (5) in front of the pumping device (3), and wherein the entire flow of fluid conveyed by the pumping device (3) pumping is introduced from the pressure side (3.2) of the pumping device (3) through a section of the flushing channel with multiple angles along the axis of rotation (DA) of the rotor above the rotor (4.1) in the rotor gap (5) and, after flowing around the rotor (4.1), is fed through the outlet ( 6b) from the rotor space at the outlet (2.2) of the pump. Method according to claim 12, characterized in that, in order to flush the rotor space (5), the fluid is conveyed along the axis of rotation (DA) of the rotor to an upper side of the rotor space (5). which faces the opposite side of the pumping device (3) and, after flowing around the rotor (4.1) along the upper side (4.1.1) of the rotor and the peripheral surface (4.1.2) of the rotor, is evacuates at the outlet (6b) of the rotor space.