Beverage pump

Abstract

The invention proceeds from a beverage pump, in particular a reciprocating piston pump, for a household appliance (12a), in particular for a beverage dispenser, for delivering a liquid, with at least one coil former (14a; 14b), at least one coil wire which is wound onto the coil former (14a; 14b) to form a coil (16a; 16b), with a working piston (18a; 18b), with a pumping chamber (20a; 20b) in which the working piston (18a; 18b) is axially movably guided and, with a mounted working piston (18a; 18b), has a pre-chamber (22a; 22b), a pressure chamber (24a; 24b) and an outlet chamber (26a; 26b), and which has a piston guide (28a; 28b), with a solenoid actuator (30a; 30b) which is provided to generate a magnetic field for driving the working piston (18a; 18b), and with an outlet valve (32a; 32b) which is arranged in terms of flow between the pressure chamber (24a; 24b) and the outlet chamber (26a; 26b) and which has at least one compression chamber unit (34a; 34b), with a compression chamber housing (36a; 36b), and at least one valve element (38a; 38b). It is proposed that the piston guide (28a; 28b) and / or the compression chamber housing (36a; 36b) are / is free from glass fibres.

Description

[0001] Beverage pump

[0002] State of the art

[0003] The invention relates to a beverage pump.

[0004] A beverage pump, in particular an oscillating piston pump, for a household appliance, in particular for a beverage vending machine, for conveying a liquid, having at least one coil carrier, at least one coil wire wound onto the coil carrier to form a coil, having a working piston, having a pumping chamber in which the working piston is guided so as to be axially movable, which pumping chamber, when the working piston is mounted, has a pre-chamber, a pressure chamber and an outlet chamber and which has a piston guide, having a magnetic actuator which is intended to provide a magnetic field for driving the working piston, and having an outlet valve which is arranged fluidically between the pressure chamber and the outlet chamber and which has at least one compression chamber unit with a compression chamber housing, and at least one valve element, has already been proposed.

[0005] The object of the invention is, in particular, to provide a generic device with improved properties regarding sustainability, in particular recyclability and / or circular economy capability. This object is achieved according to the invention by the features of patent claim 1, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0006] Advantages of the invention

[0007] The invention relates to a beverage pump, in particular an oscillating piston pump, for a household appliance, in particular for a beverage vending machine, for conveying a liquid, with at least one coil carrier, at least one coil wire which is wound onto the coil carrier to form a coil, with a working piston, with a pump chamber in which the working piston is guided so as to be axially movable, which pump chamber has a pre-chamber, a pressure chamber and an outlet chamber when the working piston is mounted, and which pump chamber has a piston guide, with a magnetic actuator which is intended to provide a magnetic field for driving the working piston, and with an outlet valve which is arranged fluidically between the pressure chamber and the outlet chamber and which has at least one compression chamber unit with a compression chamber housing, and at least one valve element.

[0008] It is proposed that the piston guide and / or the compression chamber housing be free of glass fibers. Preferably, the piston guide and / or the compression chamber housing are free of a glass fiber reinforced plastic. Particularly preferably, the piston guide and / or the compression chamber housing are free of a composite material. Glass fibers, particularly in a composite material, prevent meaningful recyclability and / or suitability for a circular economy. However, glass fibers are generally required in particular to achieve sufficient mechanical stability and / or thermal stability. The design of the beverage pump according to the invention can, in particular, improve the recyclability of the beverage pump. In particular, materials that are difficult or impossible to recycle can be dispensed with or at least reduced.This, in turn, advantageously minimizes the beverage pump's ecological footprint. Furthermore, the beverage pump can be used to facilitate a fully circular economy. Parts of the beverage pump, in particular, can be reused. In particular, the piston guide and / or the compression chamber housing can be used for multiple beverage pumps.

[0009] In this context, a “drinks vending machine” should be understood to mean, in particular, a machine designed for the portion-wise dispensing and / or preparation of beverages, such as coffee, tea, cocoa, and / or other milk-based drinks and / or brewed beverages. The drinks vending machine is preferably designed as a coffee machine, more preferably as a fully automatic coffee machine. The drinks pump is preferably designed as an oscillating piston pump. The drinks pump preferably has at least one floatingly mounted working piston, which is designed to be driven, in particular, by a magnetic flux conducted by a pole sleeve. In particular, the working piston is designed for stop-free movement in the pump chamber. The working piston is preferably designed to move at least substantially parallel to a central axis of the pole sleeve.The beverage pump is preferably designed as a high-pressure oscillating piston pump and intended to provide a pressure of at least 10 bar, preferably at least 15 bar. It is also conceivable for the beverage pump to be designed as a low-pressure oscillating piston pump and intended to provide a pressure of at least 3 bar. In particular, the beverage pump is designed as a household appliance oscillating piston pump. The beverage pump is preferably designed as a vending machine pump. The beverage pump preferably has an iron circuit which comprises two pole sleeves. The pole sleeves are preferably at least substantially tubular. The pole sleeve is preferably in the shape of a hollow cylinder and has a central axis. The pole sleeve surrounds the pump chamber. The pole sleeve is preferably arranged outside the pump chamber. In particular, the beverage pump has a pump chamber in which the working piston is guided.Directional designations such as “axial”, “radial”, “in the circumferential direction” should be understood as referring to a central axis of the pumping chamber and / or to the central axis of the pole sleeve. “Axial” should be understood as meaning in the direction of the central axis of the pumping chamber and / or in the direction of the central axis of the pole sleeve. “Radial” in this context should be understood as meaning in particular a direction perpendicular to the central axis of the pole sleeve and / or perpendicular to the central axis of the pumping chamber, starting from the respective central axis outwards. “In the circumferential direction” in this context should be understood as meaning in particular a direction along a circular arc around the central axis of the pole sleeve and / or around the central axis of the pumping chamber in a plane perpendicular to the central axis of the pole sleeve and / or perpendicular to the central axis of the pumping chamber.

[0010] The piston guide forms in particular a basic body of the pump chamber.

[0011] The piston guide preferably has a hollow cylindrical basic shape. The piston guide is intended, in particular, to directly guide the working piston. The pole sleeves are preferably arranged directly adjacent to the piston guide. The pole sleeves are preferably arranged around the piston guide.

[0012] The outlet valve forms, in particular, a check valve having a passage direction from the pressure chamber to the outlet chamber. Preferably, the outlet valve also comprises a spring element which, in an assembled state, presses the valve element against a valve seat of the compression chamber unit, in particular the compression chamber housing. The spring element is, in particular, formed by a helical spring. The valve element is, in particular, formed by a movable, closing part of the outlet valve. The valve element, in particular, forms a valve body. Various configurations of the valve element that would appear expedient to a person skilled in the art are conceivable. The valve element is, in particular, guided in the compression chamber unit. The valve element is, in particular, guided in the compression chamber housing. Furthermore, the compression chamber housing, in particular, forms a valve seat for the valve element."Intended" should be understood in particular to mean specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0013] It is further proposed that the piston guide be made at least partially, in particular entirely, of a homogeneous material. Preferably, the piston guide is free of composite materials. Preferably, the piston guide is made entirely of a homogeneous material, such as a metal material or a plastic. In this context, a “homogeneous material” is to be understood in particular as a material of consistently uniform composition or a material consisting of different materials, wherein the different materials are homogeneously mixed with one another. Preferably, this is to be understood in particular as a material of consistently uniform composition. In this way, the recyclability of the beverage pump can be advantageously kept high. In particular, materials that are difficult or impossible to recycle can be dispensed with or at least reduced.Furthermore, it is proposed that the piston guide be made at least partially of a metal material. Preferably, the piston guide is made at least partially, in particular entirely, of a metal alloy. Preferably, the piston guide is made at least partially, in particular entirely, of stainless steel. However, other materials deemed appropriate by a person skilled in the art are also conceivable. This makes it possible, in particular, to provide an advantageously reusable and / or recyclable piston guide. In particular, it enables single-material recycling.

[0014] It is further proposed that the piston guide be formed by a deep-drawn part. The piston guide is preferably manufactured by deep-drawing. The piston guide is preferably formed by a deep-drawn sleeve. This makes it possible to provide, in particular, an advantageously reusable and / or recyclable piston guide. In particular, it enables single-material recycling. Known piston guides are made, in particular, of glass-fiber-reinforced plastic.

[0015] It is further proposed that the piston guide has a base body made of a plastic and at least one reinforcing sleeve made of a metal material. Preferably, the piston guide is designed at least in two parts. The base body and the reinforcing sleeve are connected to one another in a form-fitting and / or force-fitting manner and are free of any material bond. However, it would also be conceivable for the base body and the reinforcing sleeve to be at least partially material-fittingly connected to one another. In this case, it would be particularly conceivable for the base body to be injection-molded onto the reinforcing sleeve. Alternatively, it would also be conceivable for the base body to be manufactured, for example, by means of an additive process, such as 3D printing."Form-fitting and / or force-fitting connection" is understood in particular to mean a detachable connection, wherein a holding force between two components is preferably transmitted through a geometric engagement of the components and / or a frictional force between the components. "Form-fitting" is understood in particular to mean that abutting surfaces of form-fitting components exert a holding force on each other in the normal direction of the surfaces. In particular, the components are geometrically engaged with each other. This makes it possible to provide, in particular, a piston guide that is advantageously stable and yet easy to recycle. In particular, it enables simple and clear material separation. In particular, it can prevent the mixing of materials.

[0016] It is also proposed that the reinforcing sleeve be formed by an internal metal tube adjacent to the base body. The metal tube preferably has a material thickness that is less than the material thickness of the base body. The base body preferably has a hollow-cylindrical basic shape. The material thickness of the reinforcing sleeve is preferably less than 3 mm, preferably less than 2 mm, and particularly preferably less than 1 mm. The pole sleeves are preferably arranged on the base body. However, it would also be conceivable for the pole sleeves to be arranged between the base body and the reinforcing sleeve or to be partially accommodated in the base body.

[0017] It is further proposed that the compression chamber housing be partially, in particular entirely, made of a homogeneous material. The compression chamber housing is preferably free of composite materials. The compression chamber housing is preferably made entirely of a homogeneous material, such as a metal material or a plastic. This advantageously maintains the high recyclability of the beverage pump. In particular, poorly or non-recyclable materials can be dispensed with or at least reduced.

[0018] Furthermore, it is proposed that the compression chamber housing be made at least partially of a metal material. Preferably, the compression chamber housing is made at least partially, in particular entirely, of a metal alloy. Preferably, the compression chamber housing is made at least partially, in particular entirely, of stainless steel. However, other materials deemed appropriate by a person skilled in the art are also conceivable. This makes it possible, in particular, to provide an advantageously reusable and / or recyclable compression chamber housing. In particular, it enables single-material recycling.

[0019] It is further proposed that the compression chamber housing be formed from a deep-drawn part. The compression chamber housing is preferably manufactured by deep-drawing. The compression chamber housing is preferably formed from a multi-stage deep-drawn sleeve, which is intended to accommodate at least one compression chamber inner part. The compression chamber inner part preferably directly delimits the compression chamber, wherein the compression chamber housing accommodates the compression chamber inner part. This makes it possible, in particular, to provide an advantageously reusable and / or recyclable compression chamber housing. In particular, it enables single-material recycling. Known compression chamber housings are made, in particular, from glass-fiber-reinforced plastic.

[0020] It is further proposed that the compression chamber housing be made entirely of a plastic material. Preferably, the compression chamber housing is made of a homogeneous plastic material. Preferably, the compression chamber housing has an increased wall thickness. Preferably, the compression chamber housing has a wall thickness that is greater than that of a conventional compression chamber housing. Preferably, the compression chamber housing has an average wall thickness of at least 1.5 mm, preferably at least 2 mm, and particularly preferably at least 2.5 mm. Particularly preferably, the compression chamber housing and the compression chamber inner part are made of a plastic material. The plastic material is preferably food-grade. This makes it possible, in particular, to provide a compression chamber housing that is advantageously easy to manufacture. In particular, it makes possible to enable single-material recycling.

[0021] It is further proposed that the valve element be made partially, in particular entirely, of glass. The valve element is in particular movably mounted in the compression chamber housing, in particular in the compression chamber inner part. The valve element preferably has a spherical shape. However, another shape that would appear appropriate to a person skilled in the art would also be conceivable. Preferably, a material of the compression chamber housing, in particular of the compression chamber inner part, is adapted to the material of the valve element. Preferably, the material of the compression chamber housing, in particular of the compression chamber inner part, is softer, in particular softer and more elastic, than the material of the valve element in order to avoid damage to the valve element. It is further proposed that the valve element be formed from a glass sphere. This makes it possible, in particular, to provide an advantageously reusable and / or recyclable valve element.In particular, a valve element with an advantageous long lifespan can be provided. Furthermore, separate recycling can be enabled.

[0022] Furthermore, it is proposed that the coil carrier consists at least partially, in particular completely, of a homogeneous material. It is further proposed that the coil carrier consists partially, in particular completely, of glass. In particular, the coil carrier is at least partially cylindrical, in particular hollow cylindrical, in particular. In particular, the coil carrier surrounds at least one cavity which is intended to accommodate a magnetic body, in particular the armature of an oscillating armature pump, and the piston guide. In particular, the coil is intended to generate a magnetic field, at least in a current-operated state, which is intended to move the magnetic body from its rest position. In particular, the coil is hollow cylindrical. In particular, the coil is designed as an elongated coil, i.e., in particular, has a length which is greater than an inner diameter of the coil.For example, the coil has between 1000 and 5000 turns. Preferably, the beverage pump further comprises a coil housing. A “coil housing” is to be understood in particular as a mechanical enclosure, in particular a housing. Preferably, the coil housing has at least one wall that is positively and / or non-positively connected to the coil carrier, and a yoke plate. Preferably, the wall is connected to the coil carrier in a tool-free and / or detachable manner. In particular, the wall and the base body are connected to one another by means of a snap connection. This allows for simple assembly. Preferably, the wall is designed like a grid, in particular with holes and / or gaps. In particular, the wall is formed at least partially, for example at least 50%, advantageously at least 90%, from at least one plastic.The coil housing, in particular the at least one wall, advantageously has holes and / or gaps. The holes and / or gaps preferably each have a size of a maximum of 0.2 sr, advantageously a maximum of 0.1 sr, preferably a maximum of 0.05 sr, with respect to the geometric center of the coil. In particular, these holes and / or gaps serve for ventilating and / or cooling the coil. In particular, the proportion of the holes amounts to a maximum of 90%, for example a maximum of 50%, in particular a maximum of 30%, of a solid angle covered by the wall. In particular, the holes and / or gaps each have a size of a maximum of 2 cm. 2 , for example a maximum of 1 cm 2 , in particular a maximum of 0.5 cm 2 , on.

[0023] The coil housing, in particular the at least one wall, preferably comprises a holder for receiving a thermal fuse, which is intended to arrange the thermal fuse close to the coil, in particular in mechanical contact with the coil. In particular, this allows simple installation of the coil device. The coil device preferably comprises the thermal fuse. In particular, the thermal fuse is intended to be connected in series with the coil. In particular, the thermal fuse is intended to interrupt or at least inhibit a current flow through the coil, in particular permanently, when a limit temperature is exceeded. In particular, the thermal fuse has a non-linear resistor. In particular, the thermal fuse is designed as a fuse. Alternatively, the thermal fuse can have a switching element, in particular a half-switch switching element or a bimetallic switching element.In particular, the holder is provided to accommodate the thermal fuse in a form-fitting manner, in particular by means of at least one snap connection. Furthermore, the coil housing can have at least one diode holder for receiving a power diode, wherein the power diode is in particular provided to be connected in series with the coil. In particular, this makes it possible to easily install the coil device. Preferably, the coil device comprises the power diode. In particular, the power diode is provided to allow current to flow through the coil only in one current direction, in particular to prevent deflection of the armature of the oscillating armature coil in the wrong direction. In particular, the diode holder is provided to accommodate the power diode in a form-fitting manner, in particular by means of at least one snap connection.

[0024] Furthermore, the invention is based on a household appliance, in particular a drinks vending machine, with the drinks pump.

[0025] The beverage pump according to the invention and / or the household appliance according to the invention should not be limited to the application and embodiment described above. In particular, the beverage pump according to the invention and / or the household appliance according to the invention can have a number of individual elements, components, and units as well as method steps that differs from the number stated herein in order to fulfill a function described herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily.

[0026] Drawings

[0027] Further advantages will become apparent from the following description of the drawings. The drawings illustrate two exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0028] They show:

[0029] Fig. 1 is a schematic view of a household appliance according to the invention,

[0030] Fig. 2 shows a beverage pump of the household appliance according to the invention in a schematic representation,

[0031] Fig. 3 shows the beverage pump of the household appliance according to the invention in a schematic exploded view,

[0032] Fig. 4 the beverage pump of the household appliance according to the invention in a schematic side view,

[0033] Fig. 5 a section along a longitudinal axis through the beverage pump of the household appliance according to the invention and

[0034] Fig. 6 shows a section along a longitudinal axis through an alternative beverage pump according to the invention of a household appliance.

[0035] Description of the embodiments

[0036] Figure 1 shows a household appliance 12a configured as a beverage vending machine. In the present exemplary embodiment, the household appliance 12a is designed to prepare portioned beverages and dispense portions of beverages. The household appliance 12a is configured as a fully automatic coffee machine. The household appliance 12a includes storage containers (not shown in detail) for water and coffee. The household appliance 12a has an operating unit 44a provided for user input. The household appliance 12a includes a storage rack 46a and a container receptacle 48a. The household appliance 12a includes a dispensing unit 50a for dispensing portions of beverages, in particular into a container arranged in the container receptacle 48a. The household appliance 12a includes a beverage pump 10a (see Figure 2). The beverage pump 10a is designed to pump a liquid, for example water, under a pressure of at least 12 bar.The beverage pump 10a is designed to deliver liquid against a back pressure of 12 bar. It is conceivable that the beverage pump 10a is designed to deliver a liquid under a lower pressure, such as at least 8 bar, 7 bar, or 4 bar. It is also conceivable that the beverage pump 10a is designed to deliver a liquid under a higher pressure, such as 15 bar. The beverage pump 10a is designed to deliver the liquid in a main flow direction 74a.

[0037] The beverage pump 10a is formed by a reciprocating piston pump. The beverage pump 10a has a coil carrier 14a. Furthermore, the beverage pump 10a has a coil wire wound onto the coil carrier 14a to form a coil 16a. The coil carrier 14a has a contact interface 54a designed to receive at least one end of the coil wire. The contact interface 54a has an insulation displacement terminal 56a designed to electrically contact the end of the coil wire by means of an insulation displacement contact. The insulation displacement terminal 56a has a contact point designed as a plug contact for attaching an electrical supply line, in particular for contacting by means of a flat receptacle. Alternatively, the contact interface 54a can have a solder contact. According to a further alternative, the contact point for attaching an electrical supply line is designed as a separate component from the insulation displacement terminal 56a.According to further embodiments, the contact interface 54a can have a contact element that is an alternative to the insulation displacement contact, in particular a screw or plug-in contact, for contacting the coil wire. The coil carrier 14a has a hollow cylindrical base body and two cover plates, wherein the base body and the cover plates are integrally connected to one another. The cover plates are arranged on opposite sides of the base body. The contact interface 54a is arranged on one of the cover plates of the coil carrier 14a.

[0038] The coil carrier 14a consists at least partially of a homogeneous material. The coil carrier 14a consists entirely of a homogeneous material. The coil carrier 14a consists at least partially, in particular entirely, of glass.

[0039] The coil wire consists of an aluminum wire. The coil wire is made of an insulated aluminum wire.

[0040] Furthermore, the beverage pump 10a has a coil housing 52a, which is intended to partially enclose the coil 16a. The coil housing 52a differs from a sealing overmolding of the coil 16a. The coil 16a is free of a sealing overmolding. The coil housing 52a has at least one wall 58a, 60a, in particular two walls 58a, 60a, which are positively and / or non-positively connected to the coil carrier 14a, and a yoke plate 62a.

[0041] The walls 58a, 60a are each connected or connectable to the coil carrier 14a in a tool-free manner, allowing assembly and / or removal. The cover plates of the coil carrier 14a have locking recesses designed to receive locking pins of the walls 58a, 60a.

[0042] The coil housing 52a comprises a holder 64a for receiving a thermal fuse 66a. The beverage pump 10a has the thermal fuse 66a, which is received in the holder 64a. The holder 64a is intended to arrange the thermal fuse 66a near the coil. The thermal fuse 66a is designed, for example, as a bimetallic switch, alternatively, for example, as a semiconductor switch. The holder 64a is intended to receive the thermal fuse 66a itself in a receiving space, in particular a cage-like one. The holder 64a further has a positive locking means, in particular a locking lug, which is intended to hold the thermal fuse 66a in the receiving space. The holder 64a is formed by one of the walls 58a. The holder 64a is formed integrally with the wall 58a.The yoke plate 62a is formed by a circumferential steel sheet extending around the coil support 14a in a plane parallel to a central axis of the coil support 14a. The yoke plate 62a rests against the cover plates of the coil support 14a. The yoke plate 62a defines the coil support 14a in four directions, with a fifth and sixth direction partially defined by the walls 58a, 60a. The yoke plate 62a has a rectangular shape.

[0043] The beverage pump 10a further comprises a magnetic actuator 30a. The beverage pump 10a comprises a working piston 18a. The magnetic actuator 30a is provided to provide a magnetic field for driving the working piston 18a. The working piston 18a is mounted in a floating manner. The beverage pump 10a comprises two spring elements 68a, 70a acting on the working piston 18a. The spring elements 68a, 70a are provided to act on the working piston 18a in opposite directions. One of the spring elements 68a is designed as a pump spring. The spring element 68a designed as a pump spring is provided to drive the working piston 18a during a compression stroke. The spring element 68a is designed as a helical compression spring. The working piston 18a is in a magnetically unactuated state in a defined rest position. The working piston 18a is in a magnetically unactuated state by the magnetic actuator 30a in a defined rest position.The working piston 18a is held in the defined rest position and / or moved into the defined rest position by means of the spring elements 68a, 70a. The beverage pump 10a has a pump chamber 20a in which the working piston 18a is guided for axial movement. With a mounted working piston 18a, the pump chamber 20a has a pre-chamber 22a, a pressure chamber 24a, and an outlet chamber 26a. Furthermore, the pump chamber 20a has a piston guide 28a. The piston guide 28a forms a pump chamber wall. The working piston 18a is guided in the pump chamber 20a and, for this purpose, contacts the pump chamber 20a at least in sections. The pump chamber 20a passes through the coil carrier 14a with the coil 16a. The coil 16a is provided to generate a magnetic field that partially passes through the pump chamber 20a. In the present embodiment, the pump chamber 20a is at least substantially cylindrical.The pump chamber 20a has a central axis 72a, which corresponds to a cylinder axis and is aligned at least substantially parallel to the main flow direction 74a. The piston guide 28a is made at least partially of a homogeneous material. The piston guide 28a is made entirely of a homogeneous material. The piston guide 28a is made of a metal material. The piston guide 28a is formed by a deep-drawn part. The piston guide 28a is formed by a deep-drawn sleeve. The piston guide 28a forms a collar on one side for fixing the piston guide 28a between a bearing ring 100a and a second pole sleeve 78a. Furthermore, the piston guide 28a forms a step for supporting the first spring element 68a. Furthermore, the piston guide 28a is formed in one piece with a connecting element 96a.

[0044] To direct the magnetic field, the beverage pump 10a comprises an iron circuit that partially surrounds the coil 16a. The iron circuit comprises at least one pole sleeve 76a, 78a for conducting a magnetic flux generated by the magnetic actuator 30a. The iron circuit comprises two separate pole sleeves 76a, 78a for conducting a magnetic flux generated by the magnetic actuator 30a. The first pole sleeve 76a is at least substantially in the form of a hollow cylinder. The first pole sleeve 76a has a central axis that corresponds to a cylinder axis. In an assembled state, the central axis 72a of the pump chamber 20a and the central axis of the first pole sleeve 76a at least substantially coincide. In an assembled state, the first pole sleeve 76a is arranged coaxially with the pump chamber 20a. In the present exemplary embodiment, the first pole sleeve 76a is designed as a rotated part.It is conceivable that the first pole sleeve 76a is manufactured using a different method and, for example, is designed as a rolling part. In the present embodiment, the first pole sleeve 76a is rotationally symmetrical.

[0045] The first pole sleeve 76a has a significantly changing magnetic conductivity along the main flow direction 74a of the liquid to be conveyed. The first pole sleeve 76a has a reduced magnetic conductivity in an axial edge region 80a. The first pole sleeve 76a has a reduced effective wall material volume in the axial edge region 80a. The first pole sleeve 76a has an axial sectional profile that has a reduced wall thickness in the axial edge region 80a. The axial edge region 80a is arranged at an axial edge of the first pole sleeve 76a. The first pole sleeve 76a has a minimal wall thickness at the axial edge. The first pole sleeve 76a has a minimal wall thickness at the axial edge relative to the edge region 80a. In the present exemplary embodiment, the first pole sleeve 76a has a wall thickness of at least substantially 0.8 mm at the axial edge.It is conceivable for the first pole sleeve 76a to have a wall thickness of less than 0.8 mm or a vanishingly small wall thickness at the axial edge. It is conceivable for the first pole sleeve 76a to have a wall thickness greater than 0.8 mm at the axial edge. In the present exemplary embodiment, the first pole sleeve 76a has a conical shape in the axial edge region 80a. The wall thickness increases in the axial edge region 80a with a distance from the axial edge. The wall thickness increases monotonically in the axial edge region 80a with a distance from the axial edge.

[0046] The first pole sleeve 76a has a base wall thickness compared to which the wall thickness is reduced in the axial edge region 80a. The wall thickness is smaller than the base wall thickness everywhere in the axial edge region 80a. The first pole sleeve 76a has a further region outside the axial edge region 80a in which the wall thickness consistently corresponds to the base wall thickness. The wall thickness is at least substantially constant in the further region. The further region has an axial extent that corresponds at least substantially to 80% of a total axial extent of the first pole sleeve 76a. The further region extends over more than two-thirds of a total axial extent of the first pole sleeve 76a. The further region and the axial edge region 40a encompass the entire first pole sleeve 76a. The base wall thickness corresponds to a maximum wall thickness of the first pole sleeve 76a.In the present embodiment, the base wall thickness has a value of at least substantially 2.5 mm.

[0047] The axial cross-sectional profile of the first pole sleeve 76a is derived from a force-displacement characteristic curve. The force-displacement characteristic curve represents the dependence of a magnetic force on an axial position of the working piston 18a. The magnetic force is provided by the magnetic actuator 20a due to a magnetic flux generated by the magnetic actuator 30a.

[0048] The axial sectional profile has at least one bevel. The bevel is arranged in the axial edge region 80a of the axial sectional profile. The bevel has an axial extent and a radial extent derived from the force-displacement characteristic curve. The axial edge region 80a has an axial extent with a value of at least 2 mm. In the present exemplary embodiment, the first pole sleeve 76a has an axial extent of at least substantially 18 mm. The axial edge region 80a has an axial extent that amounts to at least 20% of a total axial extent of the first pole sleeve 76a. The axial edge region 80a has an axial extent with a value of at most 10 mm. The axial edge region 80a has an axial extent that amounts to at most 30% of a total extent of the first pole sleeve 76a.In the present embodiment, the axial edge region 80a has an axial extent of at least substantially 4.7 mm. The axial extent of the axial edge region 80a amounts to at least substantially 25% of the total axial extent of the first pole sleeve 76a.

[0049] The beverage pump 10a has a second pole sleeve 78a, which is arranged at a distance from the first pole sleeve 76a. The iron circuit of the beverage pump 10a has a second pole sleeve 78a, which is arranged at a distance from the first pole sleeve 76a. The second pole sleeve 78a is at least substantially in the shape of a hollow cylinder. The second pole sleeve 78a has a central axis that corresponds to a cylinder axis and a central axis of the first pole sleeve 76a. In an assembled state, the central axis 72a of the pump chamber 20a and the central axis of the second pole sleeve 78a at least substantially coincide. In an assembled state, the second pole sleeve 78a is arranged coaxially to the first pole sleeve 76a and to the pump chamber 20a. In the present exemplary embodiment, the second pole sleeve 78a is designed as a rolling part.It is conceivable that the second pole sleeve 78a is manufactured using a different method and, for example, is designed as a turned part. In the present embodiment, the second pole sleeve 78a is rotationally symmetrical.

[0050] The second pole sleeve 78a is spaced apart from the first pole sleeve 76a by a gap 82a. The second pole sleeve 78a is intended to conduct a magnetic flux generated by a magnetic actuator 30a. The gap 82a is designed as a magnetically insulating gap 82a. A spacer ring made of a non-magnetizable material is arranged in the gap 82a. The first pole sleeve 76a and the second pole sleeve 78a enclose the magnetically insulating gap 82a between them in the axial direction. The magnetically insulating gap 82a interrupts the iron circuit. In an assembled state, the axial edge of the axial edge region 80a delimits the magnetically insulating gap 82a of the iron circuit. The magnetically insulating gap 82a is spatially arranged axially between the first pole sleeve 76a and the second pole sleeve 78a.The axial edge region 80a of the first pole sleeve 76a is arranged on a side of the first pole sleeve 76a facing the magnetically insulating gap 82a. The second pole sleeve 78a adjoins the gap 82a with one end face. The second pole sleeve 78a has a base wall thickness that corresponds to the base wall thickness of the first pole sleeve 76a. The first pole sleeve 76a and the second pole sleeve 78a have the same base wall thickness. The first pole sleeve 76a and the second pole sleeve 78a are arranged coaxially to one another. The first pole sleeve 76a and the second pole sleeve 78a are arranged in alignment with one another. The first pole sleeve 76a and the second pole sleeve 78a have the same outer diameter. The first pole sleeve 76a is arranged upstream of the second pole sleeve 78a with respect to the main flow direction 74a. The first pole sleeve 76a is arranged opposite the second pole sleeve 78a on the inlet side.In an assembled state, an axial extension of an arrangement consisting of the first pole sleeve 76a, the magnetically insulating gap 82a and the second pole sleeve 78a is greater than an axial extension of the coil 16a.

[0051] The first pole sleeve 76a and the second pole sleeve 78a each surround the pumping chamber 20a. The first pole sleeve 76a and the second pole sleeve 78a are arranged radially between the coil 16a and the pumping chamber 20a. The second pole sleeve 78a has a chamfer on an edge facing the magnetically insulating gap 82a. The chamfer is arranged on an outer circumference of the further pole sleeve 78a. The chamfer has an angle of at least substantially 45 degrees. It is conceivable for the chamfer to have an angle deviating from 45 degrees, for example a flatter angle or a steeper angle, relative to the outer circumference. The chamfer has a width of at least substantially 1.5 mm. It is conceivable for the chamfer to have a larger width or a smaller width. It is conceivable for the second pole sleeve 78a to be chamfer-free.

[0052] The working piston 18a of the beverage pump 10a comprises an armature element 84a made entirely of a magnetizable material. To achieve a pumping effect, the coil 16a is energized with a pulsed voltage, creating a constantly changing magnetic field in the area of ​​the pump chamber 20a. The pulsed magnetic field, which is guided through the pole sleeves 76a, 78a, causes the working piston 18a to initially deflect from its rest position against the force of the spring element 68a, designed as a pump spring, as the strength of the magnetic field increases. The magnetic force acting on the working piston 18a depends on a field density at the location of the armature element 84a, which in turn is determined in particular by the shape of the pole sleeves 76a, 78a. As soon as the current through the coil 16a is reduced and the strength of the magnetic field drops again, the working piston 18a is moved towards the rest position by the force of the spring element 68a.A diode unit (not shown in detail) is preferably connected upstream of the coil 16a, whereby the coil 16a is only supplied with a half-wave of an alternating voltage. In the illustrated embodiment, the coil 16a is designed for an alternating voltage of 230 V at 50 Hz.

[0053] At least depending on the shape of the pole sleeves 76a, 78a, a defined characteristic curve of the beverage pump 10a can be achieved.

[0054] The working piston 18a comprises a piston valve 86a, which is fluidically arranged between the pre-chamber 22a and the pressure chamber 24a. The piston valve 86a is arranged centrally in the beverage pump 10a and centrally in the working piston 18a with respect to a longitudinal axis of the beverage pump 10a. The piston valve 86a is designed as a check valve, which has a flow direction from the pre-chamber 22a into the pressure chamber 24a. The piston valve 86a comprises a valve seat 88a, a closure part 90a, and a closing spring 92a. The closing spring 92a is provided to pull the closure part 90a onto the valve seat 88a. In a filling stroke, in which the working piston 18a is moved by the magnetic field against the force of the spring element 68a designed as a pump spring, fluid flows from the pre-chamber 22a through the piston valve 86a into the pressure chamber 24a.In a subsequent pressure stroke, in which the working piston 18a is moved by the force of the spring element 68a, the fluid is forced out of the pressure chamber 24a. The maximum pressure acting on the fluid depends in particular on the force of the spring element 68a. The distance by which the working piston 18a is moved depends on a design of the beverage pump 10a, in particular on the shape of the pole sleeves 76a, 78a. The beverage pump 10a has two connection elements 94a, 96a. A first of the connection elements 94a is designed as an inlet element and is provided for connection to a water supply, for example to a water reservoir. The first connection element 94a has a connection piece 98a for connection to a hose. It is conceivable that the first connection element 94a has a connection coupling. Another of the connection elements 96a is designed as an outlet element and has a connection coupling.It is conceivable that the further connection element 96a has a connection piece.

[0055] The further spring element 70a is designed as a damping element. In the present embodiment, the further spring element 70a is designed as a helical spring. The working piston 18a is mounted in a floating manner between the two spring elements 68a, 70a. The working piston 18a is in at least substantially continuous contact with both spring elements 68a, 70a. It is conceivable that the further spring element 70a is designed as another elastic element, for example as a bellows element and / or as a porous element. The beverage pump 10a comprises a bearing ring 100a for a sealing element 102a. The sealing element 102a is provided to seal the prechamber 22a from the pressure chamber 24a. In an assembled state, the working piston 18a penetrates the bearing ring 100a. The sealing element 102a, together with the working piston 18a, forms a sliding seal.

[0056] The beverage pump 10a comprises an outlet valve 32a, which is fluidically arranged between the pressure chamber 24a and the outlet chamber 26a. The outlet chamber 26a is formed by the further connection element 96a. The outlet valve 32a is arranged centrally in the beverage pump 10a and centrally in the outlet chamber 26a with respect to the longitudinal axis of the beverage pump 10a. The outlet chamber 26a is fluidically arranged between the pressure chamber 24a and an outlet opening. The outlet valve 32a is designed as a check valve, which has a flow direction from the pressure chamber 24a to the outlet chamber 26a. The pressure chamber element has a circular opening that forms a valve seat for the outlet valve 32a. The outlet valve 32a has a compression chamber unit 34a with a compression chamber housing 36a and a valve element 38a. The valve element 38a consists at least partially of glass.The valve element 38a is made entirely of glass. The valve element 38a is formed by a glass sphere.

[0057] The valve element 38a is mounted for axial movement in the compression chamber unit 34a. The compression chamber unit 34a comprises the compression chamber housing 36a, a first compression chamber interior part 104a, which partially defines the pressure chamber 24a, and a second compression chamber interior part 106a, which partially defines the outlet chamber 26a. The piston valve 86a of the working piston 18a extends into the first compression chamber interior part 104a during operation. The valve element 38a is preferably guided in the first compression chamber interior part 104a. The valve element 38a is arranged entirely in the first compression chamber interior part 104a. The first compression chamber inner part 104a is shaped like a hollow cylinder and has an inwardly projecting collar as a sealing seat for the valve element 38a and, on an end facing away from the second compression chamber inner part 106a, an outwardly directed collar which forms a circumferential groove on the inside.The groove serves in particular to accommodate the sealing element 102a. The sealing element 102a is intended to seal the prechamber 22a against the pressure chamber 24a. The second compression chamber inner part 106a is cup-shaped.

[0058] The first compression chamber inner part 104a and the second compression chamber inner part 106a form an insert in the compression chamber housing 36a. The first compression chamber inner part 104a and the second compression chamber inner part 106a are detachably inserted into the compression chamber housing 36a. The first compression chamber inner part 104a and the second compression chamber inner part 106a are held in a form-fitting manner in the compression chamber housing 36a.

[0059] The compression chamber housing 36a consists at least partially of a homogeneous material. The compression chamber housing 36a consists entirely of a homogeneous material. The compression chamber housing 36a consists of a metal material. The compression chamber housing 36a is formed from a deep-drawn part. The compression chamber housing 36a forms a collar on one side for securing the compression chamber housing 36a. For this purpose, the beverage pump 10a has a mounting ring 108a, by means of which the collar of the compression chamber housing 36a can be clamped between the mounting ring 108a and the second pole sleeve 78a. The mounting ring 108a is screwed, in particular, to the yoke plate 62a. Furthermore, the compression chamber housing 36a is formed in one piece with a connecting element 96a.

[0060] The piston guide 28a and / or the compression chamber housing 36a are free of glass fibers. The piston guide 28a and the compression chamber housing 36a are free of glass fibers. The piston guide 28a and the compression chamber housing 36a are free of a composite material.

[0061] Figure 6 shows a further embodiment of the invention. The following descriptions are essentially limited to the differences between the embodiments, whereby with regard to identical components, features and functions, reference can be made to the description of the embodiment in Figures 1 to 5. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in Figures 1 to 5 has been replaced by the letter b in the reference numerals of the embodiment in Figure 6. With regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can also be made to the drawings and / or the description of the embodiment in Figures 1 to 5.

[0062] Figure 6 shows an alternative beverage pump 10b. The beverage pump 10b is formed by an oscillating piston pump. The beverage pump 10b has a coil carrier 14b. Furthermore, the beverage pump 10b has a coil wire wound onto the coil carrier 14b to form a coil 16b. Furthermore, the beverage pump 10b has a coil housing 52b, which is provided to partially enclose the coil 16b. The beverage pump 10b further comprises a magnetic actuator 30b. The beverage pump 10b comprises a working piston 18b.

[0063] The beverage pump 10b has a pump chamber 20b in which the working piston 18b is guided for axial movement. With a mounted working piston 18b, the pump chamber 20b has a pre-chamber 22b, a pressure chamber 24b, and an outlet chamber 26b. Furthermore, the pump chamber 20b has a piston guide 28b. The piston guide 28b forms a pump chamber wall. The working piston 18b is guided in the pump chamber 20b and, for this purpose, contacts the pump chamber 20b at least in sections. The pump chamber 20b extends through the coil carrier 14b with the coil 16b.

[0064] The piston guide 28b is made at least partially of a homogeneous material. The piston guide 28b is made entirely of a homogeneous material. The piston guide 28b has a base body 40b made of a plastic and a reinforcing sleeve 42b made of a metal material. The base body 40b and the reinforcing sleeve 42b are connected to one another in a form-fitting and / or force-fitting manner and are free of any material bond. The reinforcing sleeve 42b is formed by an internal metal tube adjacent to the base body 40b. The metal tube has a material thickness that is less than the material thickness of the base body 40b. The base body 40b has a hollow-cylindrical basic shape with an integrally formed connection element 94b. The material thickness of the reinforcing sleeve 42b is less than 3 mm, preferably less than 2 mm, and particularly preferably less than 1 mm. The pole sleeves 76b, 78b are arranged on the base body 40b.However, it would also be conceivable for the pole sleeves 76b, 78b to be arranged between the base body 40b and the reinforcement sleeve 42b or to be partially accommodated in the base body 40b. The base body 40b forms a collar on one side for securing the piston guide 28b between a bearing ring 100b and the second pole sleeve 78b. Furthermore, the base body forms a stop for supporting a first spring element 68b.

[0065] The beverage pump 10b comprises an outlet valve 32b, which is fluidically arranged between the pressure chamber 24b and the outlet chamber 26b. The outlet chamber 26b is formed by the further connection element 96b. The outlet valve 32b is arranged centrally in the beverage pump 10b and centrally in the outlet chamber 26b with respect to the longitudinal axis of the beverage pump 10b. The outlet chamber 26b is fluidically arranged between the pressure chamber 24b and an outlet opening. The outlet valve 32b is designed as a check valve, which has a flow direction from the pressure chamber 24b to the outlet chamber 26b. The pressure chamber element has a circular opening that forms a valve seat for the outlet valve 32b. The outlet valve 32b has a compression chamber unit 34b with a compression chamber housing 36b and a valve element 38b. The valve element 38b is mounted axially movable in the compression chamber unit 34b.The compression chamber unit 34b has the compression chamber housing 36b and a compression chamber inner part 104b, which partially delimits the pressure chamber 24b. A piston valve 86b of the working piston 18b protrudes into the compression chamber inner part 104b during operation. The valve element 38b is preferably guided in the compression chamber inner part 104b. The valve element 38b is arranged entirely within the compression chamber inner part 104b. The first compression chamber inner part 104b is hollow-cylindrical in shape and has an inwardly projecting collar as a sealing seat for the valve element 38b and an outwardly directed collar, which forms a circumferential groove on the inside. The groove serves in particular to accommodate a sealing element 102b. The sealing element 102b is provided to seal the prechamber 22b with respect to the pressure chamber 24b.

[0066] The compression chamber inner part 104b forms an insert in the compression chamber housing 36b. The compression chamber inner part 104b is detachably arranged in the compression chamber housing 36b. The first compression chamber inner part 104b is held in the compression chamber housing 36b in a form-fitting manner.

[0067] The compression chamber housing 36b is made at least partially of a homogeneous material. The compression chamber housing 36b is made entirely of a homogeneous material. The compression chamber housing 36b is made entirely of a plastic. The compression chamber housing 36b is made entirely of a homogeneous plastic. The compression chamber housing 36b has an increased wall thickness. The compression chamber housing 36b has an average wall thickness of at least 1.5 mm, preferably at least 2 mm, and particularly preferably at least 2.5 mm. The compression chamber inner part 36b is also made, in particular, of a homogeneous plastic. The compression chamber housing 36b forms a collar on one side for fixing the compression chamber housing 36b. For this purpose, the beverage pump 10b has a mounting ring 108b, by means of which the collar of the compression chamber housing 36b can be clamped between the mounting ring 108b and the second pole sleeve 78b.The mounting ring 108b is, in particular, screwed to a yoke plate 62b. Furthermore, the compression chamber housing 36b is formed in one piece with a connecting element 96b.

[0068] The piston guide 28b and / or the compression chamber housing 36b are free of glass fibers. The piston guide 28b and the compression chamber housing 36b are free of glass fibers. The piston guide 28b and the compression chamber housing 36b are free of a composite material.

[0069] List of reference symbols

[0070] 10 beverage pump

[0071] 12 household appliances

[0072] 14 coil carriers

[0073] 16 coil

[0074] 18 working pistons

[0075] 20 pump chamber

[0076] 22 Antechamber

[0077] 24 pressure chamber

[0078] 26 Outlet chamber

[0079] 28 Piston guide

[0080] 30 magnetic actuator

[0081] 32 exhaust valve

[0082] 34 compression chamber unit

[0083] 36 compression chamber housing

[0084] 38 Valve element

[0085] 40 basic bodies

[0086] 42 Reinforcement sleeve

[0087] 44 Control unit

[0088] 46 Storage grate

[0089] 48 Vascular recording

[0090] 50 output units

[0091] 52 Coil housing

[0092] 54 Contact interface

[0093] 56 insulation displacement terminal wall

[0094] wall

[0095] yoke plate

[0096] bracket

[0097] Thermal fuse

[0098] spring element

[0099] spring element

[0100] central axis

[0101] Main flow direction

[0102] Pole sleeve

[0103] Pole sleeve

[0104] peripheral area

[0105] gap

[0106] Anchor element

[0107] Piston valve

[0108] valve seat

[0109] closure part

[0110] closing spring

[0111] connecting element

[0112] connecting element

[0113] connecting piece

[0114] bearing ring

[0115] Sealing element

[0116] Compression chamber interior

[0117] Compression chamber inner part 108 mounting ring

Claims

Claims 1 . Beverage pump, in particular an oscillating piston pump, for a household appliance (12a), in particular for a beverage vending machine, for conveying a liquid, with at least one coil carrier (14a; 14b), at least one coil wire wound onto the coil carrier (14a; 14b) to form a coil (16a; 16b), with a working piston (18a; 18b), with a pumping chamber (20a; 20b) in which the working piston (18a; 18b) is guided axially movably, which, with a mounted working piston (18a; 18b), has a pre-chamber (22a; 22b), a pressure chamber (24a; 24b) and an outlet chamber (26a; 26b) and which has a piston guide (28a; 28b), with a magnetic actuator (30a; 30b) which is provided to generate a magnetic field for driving the working piston (18a; 18b), and with an outlet valve (32a; 32b) which is arranged fluidically between the pressure chamber (24a; 24b) and the outlet chamber (26a; 26b) and which has at least one compression chamber unit (34a;34b) with a compression chamber housing (36a; 36b), and at least one valve element (38a; 38b), characterized in that the piston guide (28a; 28b) and / or the compression chamber housing (36a; 36b) is free of glass fibers.; 2. Beverage pump according to claim 1, characterized in that the piston guide (28a; 28b) consists at least partially, in particular completely, of a homogeneous material.

3. Beverage pump according to claim 1 or 2, characterized in that the piston guide (28a; 28b) consists at least partially of a metal material.

4. Beverage pump according to one of the preceding claims, characterized in that the piston guide (28a) is formed by a deep-drawn part.

5. Beverage pump according to one of the preceding claims, characterized in that the piston guide (28b) has a base body (40b) made of a plastic and at least one reinforcing sleeve (42b) made of a metal material.

6. Beverage pump according to claim 5, characterized in that the reinforcing sleeve (42b) is formed by an internal metal tube adjacent to the base body (40b).

7. Beverage pump according to one of the preceding claims, characterized in that the compression chamber housing (36a; 36b) consists partially, in particular completely, of a homogeneous material.

8. Beverage pump according to one of the preceding claims, characterized in that the compression chamber housing (36a) consists at least partially of a metal material.

9. Beverage pump according to one of the preceding claims, characterized in that the compression chamber housing (36a) is formed by a deep-drawn part.

10. Beverage pump according to one of the preceding claims, characterized in that the compression chamber housing (36b) consists entirely of a plastic. 11 . Beverage pump according to one of the preceding claims, characterized in that the valve element (38a; 38b) consists partially, in particular completely, of glass.

12. Beverage pump according to claim 11, characterized in that the valve element (38a; 38b) is formed by a glass ball.

13. Beverage pump according to one of the preceding claims, characterized in that the coil carrier (14a; 14b) consists at least partially, in particular completely, of a homogeneous material 14. Beverage pump according to claim 13, characterized in that the coil carrier (14a; 14b) consists partially, in particular completely, of glass.

15. Household appliance, in particular a drinks vending machine, with a drinks pump (10a; 10b) according to one of the preceding claims.

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