Treatment device for treating fluids, in particular liquids, and treatment unit and connection head of the treatment device - Patents.com

Abstract

The present invention relates to a treatment device (10), particularly a filtration device, for fluids, particularly liquids, comprising an exchangeable treatment unit (14) and a connection head (12). The connection head (12) and the treatment unit (14) are connectable to each other by a plug-in / rotational movement using a detachable bayonet-type connection device (34). The connection device (34) includes at least one housing connection portion (100) and at least one head connection portion (32), each having at least one complementary functional element (44, 104) operatively connectable to each other. The connection device (34) includes at least one pretensioning element (54) for providing mechanical pretension, thereby pressing the complementary functional elements (44, 104) against each other. According to the present invention, the pretensioning element (54) is a spring element having at least two spring arms (53) protruding radially outward, each of which has a straight portion (55) on its radially outer end surface. The straight portion is arranged tangentially to an edge (57) that extends circularly around the connection axis (20).The invention further relates to a processing unit (14) and a connection head (12) that include a pretensioning element (54).

Description

[Technical Field]

[0001] The present invention relates to a treatment device, in particular for the treatment of liquids, in particular fuel, oil or water, in particular for filtration, in particular for motor vehicles, in particular for internal combustion engines, with an exchangeable treatment unit. The present invention further relates to a treatment unit and a connection head for the treatment device. [Background technology]

[0002] WO 2015 / 091665 discloses a filter for filtering liquids, especially fuel or oil, particularly for internal combustion engines, which includes a filter pot in which a filtering element is arranged and a filter head having an inlet and / or outlet for the fluid. The filter head and the filter pot are connected to each other by a detachable bayonet-type plug-in / rotation connection. The plug-in / rotation connection consists of at least two interacting locking parts, one of which is connected to the filter pot and the other to the filter head. Summary of the Invention

[0003] An object of the present invention is to provide a processing apparatus having a replaceable processing unit, which can be easily replaced with a small installation space.

[0004] A further object is to provide a processing unit and a connection head for such a processing device.

[0005] The above-mentioned object is achieved according to one aspect of the present invention with a treatment device, in particular a filtration device, for fluids, in particular liquids, comprising an exchangeable treatment unit including a housing pot, a housing cover, a housing with at least one inlet for the fluid to be treated and at least one outlet for the fluid to be treated, and a connection head including an infeed for the fluid to be treated connectable to the at least one inlet and / or a drain for the fluid to be treated connectable to the at least one outlet, said connection head and said treatment unit being capable of plugging in / rotating around a connection axis of said treatment device by means of a detachable bayonet-type connection device. and the connecting device comprises at least one housing connection part on the housing side and at least one head connection part on the connection head side, the housing connection part and the head connection part being operatively connectable to each other to create a connection of the connecting device, the housing connection part and the head connection part each having at least one complementary functional element operatively connectable to each other in a circumferential direction around the connection axis, the connecting device being achieved by a processing device including at least one pretensioning element for realizing a mechanical pretension by which the complementary functional elements are pressed against each other. The pretensioning element is a spring element having at least two spring arms protruding radially outward, each of the spring arms having a straight portion on its radially outer end surface, the straight portion being arranged tangentially to an edge extending circularly around the connection axis.

[0006] A further object is achieved by a processing unit, according to a further aspect of the present invention, for a processing device, which is connected to a connection head, the processing unit comprising a housing having a housing pot, a housing cover, at least one inlet for the fluid to be processed and at least one outlet for the fluid to be processed, the processing unit being connectable to the connection head of the processing device by a plug-in / rotational movement around a connection axis of the processing device by means of a detachable bayonet-type connection device, the connection device comprising a housing connection part on the housing side, the housing connection part being configured to connect the connection device to at least one head connection part on the connection head side, the at least one inlet being connectable to an infeed of the connection head for the fluid to be processed and / or the at least one outlet being connectable to a drain of the connection head for the fluid to be processed, the housing connection part and the head connection part each having at least one complementary functional element operatively connectable to each other in a circumferential direction around the connection axis, the connection device comprising at least one pretensioning element for realizing a mechanical pretension by which the complementary functional elements are pressed against each other. The pretensioning element is a spring element having at least two spring arms protruding radially outward, each of the spring arms having a straight portion on its radially outer end surface, the straight portion being arranged tangentially to an edge extending circularly around the connection axis.

[0007] A further object is, according to a further aspect of the present invention, a connection head for a treatment device, connected to a treatment unit, said treatment unit comprising a housing having a housing pot, a housing cover, at least one inlet for the fluid to be treated and at least one outlet for the fluid to be treated, said connection head of said treatment device being connectable to said treatment unit by means of a detachable bayonet-type connection device with a plug-in / rotational movement around a connection axis of said treatment device, said connection device comprising at least one head connection part on said connection head side, said head connection part being connected to at least one hand-held terminal on said housing side. a housing connection part, wherein at least one infeed of the connection head is connectable to the at least one inlet for the fluid to be treated and / or at least one drain of the connection head is connectable to the at least one outlet for the fluid to be treated, the housing connection part and the head connection part each have at least one complementary functional element operatively connectable to one another in a circumferential direction around the connection axis, the connection device being achieved by a connection head including at least one pretensioning element for realizing a mechanical pretension by which the complementary functional elements are pressed against one another, the pretensioning element being a spring element having at least two spring arms protruding radially outward, each of the spring arms having a straight portion on its radially outer end surface which is arranged tangentially to an edge extending circularly around the connection axis;

[0008] Preferred embodiments and advantages of the invention can be obtained from the accompanying claims, the description and the drawings.

[0009] The proposed treatment device, particularly a filtration device, for fluids, particularly liquids, comprises an exchangeable treatment unit including a housing having a housing pot, a housing cover, at least one inlet for the fluid to be treated, and at least one outlet for the fluid to be treated; and a connection head including an infeed for the fluid to be treated connectable to the at least one inlet and / or a drain for the fluid to be treated connectable to the at least one outlet. The connection head and the treatment unit are connectable to each other by a detachable bayonet-type connection device, which allows for a plug-in / rotational movement around the connection axis of the treatment device. The connection device includes at least one housing connection part on the housing side and at least one head connection part on the connection head side, which are operatively connectable to each other to create a connection of the connection device. The housing connection part and the head connection part each have at least one complementary functional element operatively connectable to each other in the circumferential direction around the connection axis. In this regard, the connection device includes at least one pretensioning element for realizing a mechanical pretension in which the complementary functional elements are pressed against each other.

[0010] According to the invention, the pretensioning element is a spring element having at least two spring arms projecting radially outward, each of the spring arms having a straight portion on its radially outer end face, the straight portion being arranged tangentially to an edge extending circularly around the connecting axis.

[0011] The edge can be an edge of a housing pot if the pretensioning element is arranged on a connection head, or an edge of a connection head if the pretensioning element is arranged on a processing unit.

[0012] The pretensioning element allows for a mechanical pretension that can press complementary functional elements against one another, thus keeping the connecting device under mechanical pretension, thus damping vibrations due to operation, reducing noise due to operation, preventing possible rattles in particular, and creating or increasing the locking force that must be overcome to open or close the locking operation.

[0013] Advantageously, the at least one pretensioning element is arranged on the connection head, which allows it to be configured as a lifetime part and is not replaced together with the processing unit. Alternatively or additionally, the at least one pretensioning element may be arranged on the housing, in which case it is replaced together with the processing unit.

[0014] Advantageously, the at least one pretensioning element may be elastic. The at least one pretensioning element may be elastic due to its shape and / or its material composition. Advantageously, the at least one pretensioning element comprises or consists of a plastic material, in particular an elastomer. Advantageously, the at least one pretensioning element comprises or consists of a spring element, in particular a bent wire section. Advantageously, it consists of an elastic metal.

[0015] At least one pretensioning element may be star-shaped with three or more "spikes" forming spring arms extending outward from a central region. Advantageously, in cross section, the spring arms may have a rectangular or trapezoidal shape.

[0016] The connection parts of the connecting device can be suitably formed from semi-finished or formed parts, in particular by bending, folding, crimping, cutting or pressing, etc., so that corresponding locking and (contour) guiding parts can be obtained, if required.

[0017] Advantageously, at least a part of the semi-finished product or shaped part is arranged radially inside the head connection part formed from the semi-finished product or shaped part, in particular by bending, folding, crimping, cutting or pressing, etc. Advantageously, at least a part of the semi-finished product or shaped part arranged radially inside the head connection part is closed in the circumferential direction, which improves the stability of the connection device and therefore 1st connection Department The stiffness and permanent load capacity of the connection between the two can be improved.

[0018] Advantageously, the connection part can be arranged radially inside at least one circumferential wall of the housing and / or the connection head, thereby protecting the bayonet-type connection device from the environment. Advantageously, the connection device can be arranged in a corresponding connection space between the housing and the connection head.

[0019] According to an advantageous embodiment of the processing device, the pretensioning element can be fixed to the connection head by means of a head connection part, the installation of the pretensioning element being achieved in one time-saving work step together with the installation of the head connection part without the need for additional parts.

[0020] According to an advantageous embodiment of the processing device, the spring arms can be arranged substantially flat on the edge of the housing pot, advantageously each forming three contact points with said edge.

[0021] According to an advantageous embodiment of the processing device, the pretensioning element can be configured as a bent wire section, which not only makes it inexpensive to manufacture the pretensioning element but also reduces the installation space requirements.

[0022] According to an advantageous embodiment of the processing device, at least one of the complementary functional elements may comprise an assembly ramp leading to a support region perpendicular to the connection axis, and the other of the complementary functional elements may comprise a sliding region adjacent to the support region perpendicular to the connection axis. In the connection end position of the connecting device, the two support regions may be arranged one above the other with respect to the connection axis. In particular, each support region may be circumferentially adjacent to an end stop, in particular a locking element of the at least one locking safety device, in particular a locking lug, locking portion or recess, which engages, engages with or fits together in the closed position of the at least one connecting device.

[0023] The vertical support area allows for an improved flow of forces in the functional elements on the connection head side and on the processing device side, in particular the complementary bayonet ring. Mechanical tension at the edges of the components is avoided. The support surface of the connection device is increased, which reduces wear due to relative movement and vibration between the components of the connection device. It also reduces the force required for connection and disconnection. The support area reduces "digging in" at the contact surfaces, which reduces the effects of wear when connecting and disconnecting the processing unit.

[0024] The locking safety device can reduce the risk of the connection device becoming detached due to unintentional rotation of the processing unit about the connection axis.

[0025] To lock or unlock the at least one locking safety device, a corresponding rotation of the processing unit may separate or move the corresponding locking elements past each other. For this purpose, a corresponding locking force may need to be overcome. This increased installation effort makes it easier to detect that the processing unit is in the correct position.

[0026] According to an advantageous embodiment of the processing device, one or more support areas are provided on at least one functional element, the total circumferential length of which may occupy at least 20%, preferably at least 23%, particularly preferably at least 30% of the corresponding circumference of the corresponding housing connection part and / or head connection part on the same radius. This improves the flow of forces in the components of the connecting device and further reduces mechanical tension at the edges of the components. The supporting surface of the connecting device is enlarged and more uniform.

[0027] According to an advantageous embodiment of the treatment device, an outer annular seal can be arranged radially inside the housing connection. Advantageously, at least one sealing device can be used to seal at least one fluid-conducting area of ​​the treatment device against the environment. Advantageously, the outer annular seal protrudes axially upwards or downwards by a maximum of 5 mm from the connection device. This is advantageous in terms of the utilization of installation space, since the sealing area utilizes the axial extension of the connection device.

[0028] According to an advantageous embodiment of the treatment device, the treatment unit, in particular the housing cover and / or the end disk of the filtering element, and the connection head may each comprise at least one counter element, in particular a socket, preferably a mounting socket and / or a connecting socket and / or a sealing socket and / or a cylinder socket, which correspond to each other in a pair when the treatment unit is mounted. In particular, at least one pair of counter elements is arranged inside at least one other pair of counter elements.

[0029] This allows the counter elements to be fixed relative to one another in the radial direction relative to the connecting shaft. Alternatively, the counter elements can be arranged in adjacent pairs, in particular via a sealing device, which allows for easy compensation of radial positional tolerances relative to the connecting shaft.

[0030] By arranging one pair of corresponding elements inside at least one other pair of corresponding elements, a first fluid conducting region, in particular an outflow path for the fluid, can be formed inside the inner pair of corresponding elements.

[0031] Advantageously, a second fluid-conducting region, in particular an annular inflow space for the fluid, can be formed between the pair of inner and outer counterpart elements.

[0032] The counter elements, and in particular pairs of counter elements, may each be coaxial with the connecting axis, which allows them to be positioned more easily relative to one another and also allows the fluid conducting area to be more uniform in the circumferential direction.

[0033] According to an advantageous embodiment of the processing device, the head connection and / or the housing connection can consist of or include sheet metal. Sheet metal generally exists initially as rolled metal in the form of a flat plate or strip. Sheet metal can be easily obtained with a uniform material thickness. Even with a relatively small material thickness, a mechanically stable connection can be obtained from sheet metal. This reduces the installation space, especially in the axial direction, required for the connection device. Sheet metal can be processed and treated in simple ways, especially by bending, folding, pressing, cutting, or welding. Connections between components, especially crimped or welded connections, can be easily realized using sheet metal. Advantageously, at least one of the connections is formed as a sheet metal part.

[0034] Advantageously, the head connection and / or the housing connection can be designed as a simple bent sheet metal part, rather than a drawn part. The bent part requires only a small deformation. This allows the connection device to be made from a hard material, which increases the wear resistance of the head connection and / or the housing connection. By simply bending the head connection and / or the housing connection, bulging can be largely avoided when forming the head connection and / or the housing connection.

[0035] According to a further aspect of the present invention, a processing unit for a processing device, in particular a processing device according to the preceding claims, in particular a filtration device, is proposed. The processing unit comprises a housing having a housing pot, a housing cover, at least one inlet for the fluid to be processed, and at least one outlet for the fluid to be processed. The processing unit can be connected to a connection head of the processing device by a plug-in / rotational movement about a connection axis of the processing device using a detachable bayonet-type connection device. The connection device includes at least one housing connection part on the housing side, which is configured to connect the connection device to at least one head connection part on the connection head side, wherein the at least one inlet can be connected to an infeed of the connection head for the fluid to be processed and / or the at least one outlet can be connected to a drain of the connection head for the fluid to be processed. The housing connection part and the head connection part each have at least one complementary functional element operatively connectable to each other in the circumferential direction about the connection axis, and the connection device includes at least one pretensioning element for providing a mechanical pretension by which the complementary functional elements are pressed against each other. The pretensioning element is a spring element having at least two spring arms protruding radially outward, each of the spring arms having a straight portion on its radially outer end surface, the straight portion being arranged tangentially to an edge extending circularly around the connecting axis.

[0036] According to a further aspect of the invention, a connection head for such a processing device is proposed, which includes a pretensioning element, which is a spring element having at least two spring arms projecting radially outward, each of which has a straight portion on its radially outer end face, the straight portion being arranged tangentially to an edge extending circularly around the connection axis.

[0037] Advantages and features disclosed in connection with the processing device according to the invention and its advantageous embodiments apply correspondingly to the processing unit according to the invention and the connection head according to the invention and their advantageous embodiments, and vice versa.

[0038] The edge can be an edge of a housing pot if the pretensioning element is arranged on a connection head, or an edge of a connection head if the pretensioning element is arranged on a processing unit.

[0039] The pretensioning element allows for a mechanical pretension that can press complementary functional elements together, thereby holding the connecting device under mechanical tension, thus damping operational vibrations, reducing operational noise, preventing possible rattles in particular, and creating or increasing the locking force that must be overcome to open or close the locking action.

[0040] According to an advantageous embodiment of the processing unit, the pretensioning element can be fastened to the housing cover of the processing unit by a housing connection, which allows for the installation of the pretensioning element in a compact configuration without additional parts. According to an advantageous embodiment of the connection head, the pretensioning element can likewise be fastened to the connection head by a head connection.

[0041] According to an advantageous embodiment of the processing unit, the spring arms can be configured to lie substantially flat on the edge of the connection head, in particular each spring arm being provided with three contact points with said edge. Alternatively, according to an advantageous embodiment of the connection head, the spring arms can be configured to lie substantially flat on the edge of the housing pot, advantageously in both configurations each spring arm being provided with three contact points with the edge.

[0042] According to an advantageous embodiment of the processing unit and / or the connection head, the pretensioning element can be configured as a bent wire section, which allows for inexpensive production and a wide variety of shapes.

[0043] According to an advantageous embodiment of the processing unit, the housing connection can comprise an anti-rotation device. In particular, the housing connection can comprise at least one notch on the edge as an anti-rotation device. Advantageously, the anti-rotation device can interact with the edge of the housing pot to prevent rotation.

[0044] According to an advantageous embodiment of the processing unit, the at least one housing connection part has at least one functional element operatively connectable to at least one complementary functional element of the head connection part, which at least one functional element may comprise a support area perpendicular to the connection axis.Similarly, the at least one head connection part of the connection head may have at least one functional element operatively connectable to at least one complementary functional element of the housing connection part.

[0045] In particular, at least one functional element may comprise an assembly ramp or slide area, each of which leads to a support area perpendicular to the connection axis. At the connection end of the connection device, the two support areas may be arranged one above the other relative to the connection axis. The perpendicular support areas allow for an improved flow of forces in the functional elements on the connection head side and the processing device side, in particular the complementary bayonet rings. Mechanical tensions at the edges of the components are reduced. The support surface of the connection device is increased, which reduces wear due to relative movement and vibration between the components of the connection device. It also reduces the force required for connection and disconnection. The support areas reduce "digging in" at the contact surfaces, which reduces the effects of wear when connecting and disconnecting the processing unit.

[0046] According to an advantageous embodiment of the processing unit and / or the connection head, one or more support areas are provided, the total circumferential length of which may occupy at least 20% of the corresponding circumference of the corresponding housing connection part and / or head connection part at the same radius, or at least 20%, preferably at least 23%, particularly preferably at least 30% of the corresponding circumference of the head connection part at the same radius. This improves the flow of forces in the components of the connection device and further reduces mechanical tension at the edges of the components. The support surface of the connection device is enlarged and more uniform.

[0047] Advantageously, the housing cover can be particularly elastically deformable, so that it can be pressed against the connection head or the cover ring by excess pressure present on the housing, particularly during operation of the processing device. The housing cover can thus be supported by the connection head. This reduces the requirements for the pressure stability of the housing cover. The housing cover can therefore be realized more easily, particularly with simple materials.

[0048] Advantageously, the processing unit can be a replaceable filter, in particular a replaceable oil filter or a replaceable fuel filter. In this case, the housing of the processing unit can be a filter housing. Advantageously, at least one filtering element can be arranged in the filter housing so as to separate at least one inlet and at least one outlet. Advantageously, the connection head can be a filter head to which the replaceable filter, in particular the filter housing, can be detachably attached by a connection device.

[0049] A replaceable filter is one in which at least one filter element is replaced along with the filter housing. Typically, the at least one filter element is fixedly arranged within the filter housing. Similarly, the connection between the housing pot and the housing cover is not non-destructively detachable.

[0050] The invention is not limited to treatment devices for automotive internal combustion engines. It can also be used in other internal combustion engines, especially industrial motors. The invention can also be used in other treatment devices for internal and external fluids in automotive technology. The invention can also be used in air / oil separator boxes and desiccant boxes. [Brief explanation of the drawings]

[0051] Further advantages can be obtained from the following description of the drawings, in which embodiments of the invention are shown. The drawings, the description and the claims contain a number of features in combination, which can be considered and combined as appropriate and individually by those skilled in the art to provide further combinations.

[0052] [Figure 1] 1 is an isometric view of a treatment device according to an embodiment of the invention, in particular a filtration device for motor oil of an internal combustion engine of a motor vehicle, with a treatment unit and a connection head; [Figure 2] 2 is an isometric view of the processing unit of FIG. 1 showing the top view of the housing connection. [Figure 3] FIG. 2 is a longitudinal sectional view of the processing apparatus of FIG. [Figure 4] 2 is a detailed view of the processing device of FIG. 1, showing a cross section of the housing. [Figure 5] 2 is a detailed view of the processing apparatus of FIG. 1, showing a longitudinal section of the connection head and processing unit; [Figure 6] 2 is an isometric view of the connection head of the processing apparatus of FIG. 1, showing the head connection portion inside the connection head. [Figure 7] 7 shows the connection head of FIG. 6 without the head connection and with exposed pretensioning elements. [Figure 8] FIG. 7 is an isometric view of the head connection of FIG. [Figure 9] FIG. 3 is an isometric view of the housing connection of FIG. 2. [Figure 10] FIG. 10 is an isometric view of a variation of the housing connection of FIG. 9. [Figure 11]11 is a partial cross-sectional view of a variation of the housing connection portion of FIG. 10 connected to a cover ring of a housing cover. [Figure 12] FIG. 7 is a top view of the pretensioning element of FIG. 6. [Figure 13] 2 is an isometric view of the connection head of the processing device of FIG. 1 without a splash guard and with a recognizable pretensioning element. [Figure 14] FIG. 7 is an isometric view of the splash guard of the head connection of FIG. 6, showing the outside thereof. [Figure 15] FIG. 7 is an isometric view of the splash guard of the head connection portion of FIG. 6, showing its inside. [Figure 16] 7 is an isometric view of a modification of the splash guard of the head connection part of FIG. 6, showing the outside thereof. [Figure 17] 7 is an isometric view of a modification of the splash guard of the head connection portion of FIG. 6, showing its inside. [Figure 18] 10 is an isometric view of a connection head of a processing device according to a further embodiment of the present invention; [Figure 19] 19 is an isometric view of a processing unit of a processing apparatus according to a further embodiment of the invention, showing a top view of a housing connection for the connection head of FIG. 18; [Figure 20] 19 is a top view of the head connection portion of the connection head of FIG. 18. [Figure 21] FIG. 19 is a top view of the housing connection portion of FIG. 18. DETAILED DESCRIPTION OF THE INVENTION

[0053] In the figures, identical or similar components are designated with the same reference symbols.

[0054] 1 to 17 show in different views, cross sections and detailed views a filtering device and its components for a liquid, for example, motor oil in the motor oil circuit of an internal combustion engine of a motor vehicle, according to a first embodiment of a processing device 10. The processing device 10 is intended, for example, to refine motor oil.

[0055] Figure 1 is an isometric view of a processing device 10 including a processing unit 14 and a connection head 12. Figure 2 is an isometric view of the processing unit 14 showing the top view of the housing connection 100. Figure 3 is an isometric view of the processing device 10. 10 FIG. 4 is a longitudinal sectional view of the processing device. 10 5 is a detailed view of the processing device, showing a cross section of the housing 56. 10 1 is a detailed view of the connection head 12 and the housing 56 in longitudinal section in the region thereof.

[0056] According to an advantageous embodiment of the processing unit 14, the housing connection 100 can be fixedly connected at its outer edge to the stable covering ring 61 of the housing cover 60, in particular by material fusion, in particular by welding. Advantageously, laser welding or projection welding can be used. Optionally, the connection can also be made by soldering. Advantageously, a solid, planar connection can reduce the risk of the housing connection 100 breaking due to loads over its service life, such as vibration loads. Advantageously, the housing cover 60 can be adapted to the shape of the covering ring 61 in order to increase the tensile strength of the housing connection 100.

[0057] The treatment device 10 comprises a connection head 12 configured as a filter head to which a replaceable filter, which is a treatment unit 14, is detachably fastened. The connection head 12 is fixedly connected to the internal combustion engine and serves as an attachment for the treatment unit 14. The connection head 12 is shown in detail in two embodiments in Figures 6 and 13. The connection head 12 comprises an infeed 16 and a drain 18 for motor oil. The infeed 16 and the drain 18 are connected to corresponding oil conduits of the internal combustion engine, which are not described in detail here.

[0058] Furthermore, the connection head 12 comprises a mounting socket 22 arranged coaxially and radially inside the connection shaft 20 .

[0059] In the following, unless otherwise specified, the terms "axial", "radial", "coaxial", "circumferential", etc., refer to the connecting axis 20. In the illustrated embodiment, the connecting axis 20 coincides with the filter axis of the processing unit 14.

[0060] The inner mounting socket 22 is generally cylindrical. It extends on the side of the connection head 12 facing the processing unit 14. Both ends are open. The inner mounting socket 22 is fluidly connected to the drain 18 on the side opposite the processing unit 14.

[0061] The inner mounting socket 22 is coaxially surrounded by a radially outer cylindrical mounting socket 24. The inner mounting socket 22 projects axially beyond the outer mounting socket 24 on the side facing the processing unit 14.

[0062] The inner mounting socket 22 and the outer mounting socket 24 each circumferentially define a coaxial annular inlet space 26. The annular inlet space 26 is connected to the infeed 16 by a fluid connection.

[0063] The inner mounting socket 22 and the outer mounting socket 24 are coaxially surrounded by a cylindrical circumferential wall 28. The free edge of the circumferential wall 28 facing the processing unit 14 is located at approximately the same axial height as the free edge of the outer mounting socket 24. The mounting socket 24 protrudes slightly beyond the circumferential wall 28 toward the processing unit 14.

[0064] 6 is an isometric view of the connection head 12 of the processing device 14 of FIG. 1, showing the head connection portion 32 inside the connection head 12. FIG. 7 shows the connection head 12 without the head connection portion 32 and with the exposed pretensioning element 54. FIG. 8 shows the head connection portion of FIG. 32 9 is an isometric view of a complementary housing connection 100, a variation of which is shown in FIG.

[0065] In the embodiment of the connection head 12 of Fig. 6, the circumferential wall 28 forms the radially outer boundary of the axially outer part of the connection head 12 opposite the processing unit 14. A splash guard part 150 is arranged so as to be partially covered by the circumferential wall 28. The splash guard part 150 is made, for example, from a vulcanized elastomer or a thermoplastic elastomer (TPE). The splash guard part 150 and the outer mounting socket 24 each circumferentially define a coaxial annular connection space 30. Fig. 13 shows a connection head 12 of the same configuration but without a splash guard part.

[0066] A head connection 32 of a detachable bayonet-type connection device 34 is arranged in the connection space 30. By means of the connection device 34, the processing unit 14 is detachably fastened to the connection head 12. For this purpose, a complementary housing connection 100 is arranged on the processing unit 14.

[0067] The entire substantially annular head connection portion 32 is preferably made of sheet metal, with a uniform thickness of approximately 2 to 3 mm.

[0068] The head connection portion 32 has an annular head assembly portion 36 on its radially inner side. The radially inner circumferential side of the head assembly portion 36 substantially abuts against the radially outer circumferential side of the outer mounting socket 24. The head assembly portion 36 extends radially and circumferentially substantially in-plane. The head connection portion 32 extends radially to approximately the center of the connection space 30.

[0069] In this example, the head assembly portion 36 is connected to three head-side functional elements 44 configured as bayonet portions, as can be seen in the detailed view of Figure 8. The number of functional elements 44 may be four or five instead of three.

[0070] Advantageously, the head connection part 32 and / or the housing connection part 100 can be designed as a simple bent sheet metal part, rather than as a drawn part. Bent parts require only slight deformation. Therefore, the connection device 34 can be formed from a hard material, which can improve the wear resistance of the head connection part 32 and / or the housing connection part 100. By simply bending the material, bulging can be largely avoided when forming the head connection part 32 or the housing connection part 100.

[0071] In the unformed state, the head assembly portion 36 of the head connection portion 32 does not have a circular cross-sectional shape, as shown in FIG. 8, but rather is slightly curved radially outward. In particular, the head assembly portion 36 may have a diameter that is slightly different from, and in particular larger than, the circumferential portion 40. The diameter difference is typically about 1 mm. When bending the sheet metal, the material contracts only at the head assembly portion 36, pulling the head assembly portion 36 radially inward. Meanwhile, the support area of ​​the functional element 44 remains substantially unaffected.

[0072] The housing connection part 100 has a slight curvature so that its axial length is only a few mm, for example 6 mm or less, preferably 4 mm or less, particularly preferably 3 mm or less.

[0073] The head assembly part 36 has a radial width smaller than that of the head-side bayonet part, which is the functional element 44. The head-side functional elements 44 have the same shape and size. The head-side functional elements 44 are uniformly arranged in the circumferential direction. Each head-side functional element 44 has a circumferential portion 40 that extends substantially parallel to the circumferential direction of an imaginary cylindrical wall around the connection axis 20. The circumferential portion 40 includes a flat support region 45 that is arranged perpendicular to the connection axis 20. Each functional element 44 includes an assembly slope 43 that extends obliquely in the axial direction and merges into the flat support region 45. A locking element 46 configured as an end stop 47 is provided at the end of the support region 45, which continues into a recess for the adjacent head assembly part 36.

[0074] Thus, the circumferential portion 40 connects the head assembly portion 36 to the respective assembly ramp portion 43. The assembly ramp portions 43 are particularly visible in FIG.

[0075] Each flat support area 45 has a circumferential extent 49. The total circumferential length of the flat support areas 45 of all functional elements 44 of the head connection part 32 occupies at least 20%, preferably at least 23%, particularly preferably at least 30% of the corresponding circumference of the head connection part 32 on the same radius.

[0076] Each of the assembly ramps 43 has a substantially thread-like path around the connection axis 20. The slope of the obliquely extending assembly ramps 43 corresponds approximately to the slope of a conventional right-hand thread. When viewed axially from the processing unit 14, the clockwise front free ends of the assembly ramps 43 are closer to the processing unit 14 than the clockwise rear ends thereof. Between the front ends of the assembly ramps 43 and the plane of the head assembly part 36, there is a gap into which a corresponding complementary housing-side functional element 104 configured as a bayonet part, which will be described in more detail below, can be inserted.

[0077] The sheet metal of the head connection portion 32 is the same thickness at the head assembly portion 36, the circumferential portion 40, and the assembly ramp portion 43. This also means that the head assembly portion 36 and the assembly ramp portion 43 have a uniform axial length.

[0078] The functional elements 44 each include a head-side locking projection 46. The locking projection 46 is realized as a bent portion of each of the functional elements 44. The locking projection 46 projects axially on the side facing the processing unit 14.

[0079] The processing unit 14 is detachably fastened to the connection head 12 by means of a connection device 34. For this purpose, a complementary housing connection 100 with complementary functional elements 104 is arranged on the processing unit 14. Figure 9 shows an isometric view of the housing connection 100 of Figures 2 to 5 interacting with the head connection 32. Figure 10 shows a variant of the housing connection 100.

[0080] The housing connection part 100 of the connection device 34 is formed as a coaxial annular element, preferably made of sheet metal. The thickness of the sheet metal of the housing connection part 100 corresponds approximately to the thickness of the sheet metal of the head connection part 32.

[0081] The housing connection portion 100 extends radially from the radially outer periphery of a stable cover ring 61 arranged on the housing cover 60 (FIGS. 4 and 5) beyond the radial center of the connection space 30. The housing connection portion 100 overlaps with the head connection portion 32. The cover ring 61 absorbs the internal pressure of the processing unit 14.

[0082] The housing connection part 100 includes a housing assembly part 102 that extends radially and circumferentially substantially in a plane. The housing assembly part 102 is fixed radially outwardly in the axial direction between the housing cover 60 and the edge 57 of the housing pot 58 that is crimped to the housing cover 60. It rests flat against the cover ring 61 of the housing cover 60. The assembly part 102 is connected at its edge to the cover ring 61 by material fusion, for example by welding.

[0083] The housing assembly part 102 merges radially inward into three identical housing functional elements 104 in the form of bayonet sections. The housing functional elements 104 are uniformly distributed around the circumference. They have substantially the same shape and size as the complementary head functional elements 44. The number of functional elements 104 may be four or five instead of three.

[0084] The housing-side functional element 104 complements the functional element 44 and includes a flat support area 105, a sliding area 142 at one circumferential end of the support area 105, an end stop 107 configured as a pin that protrudes slightly inward, and a locking element 106 at the other circumferential end of the support area 105. The end stop 107 abuts against the end 37 of the screw element 39 (FIG. 7) of the connection head 12 to prevent excessive rotation during assembly. When the head connection part 32 and the housing connection part 100 are connected, the sliding area 142 slides on the assembly ramp 43 of the housing-side head connection part 32. The locking element 106 allows the housing connection part 100 to be locked to the locking element 46 of the head connection part 32.

[0085] Each flat support area 105 has a contact surface 108, which is arranged on a face of the support area 105 that is not visible in FIG. 9 and which rests on the linear support area 45 of the functional element 44 when connected to the head connection part 32. Each flat support area 105 has a circumferential extent 109. The total circumferential extent of the flat support areas 105 of all functional elements 104 occupies at least 20%, preferably at least 23%, particularly preferably at least 30% of the corresponding circumference on the same radius of the housing connection part 100.

[0086] A contact surface 108 of the linear support region 105 is located on the side of each housing-side functional element 104 facing the covering ring 61 of the housing cover 60. In the closed state of the connecting device 34, the contact surface 108 is respectively engaged from behind for interaction with one of the head-side functional elements 44. In this connection, the contact surface 108 of the linear support region 105 lies flat against the corresponding flat region 45 of the functional element 44.

[0087] The housing connection part 100 has notches 115 on its outer periphery that provide anti-rotation protection when installed. In the embodiment of Figure 9, the notches 115 are located on either side of the functional element 104. In the embodiment of Figure 10, the notches 115 are rotated approximately 30° and are located near the center of the flat part 105 and the housing assembly part 102, respectively.

[0088] The crimp connection between the housing cover 60 and the housing pot 58 causes the housing cover 60 to be pulled into the notch 115, thereby creating a robust anti-rotation device.

[0089] Each of the housing-side functional elements 104 includes a housing-side locking protrusion 106. The locking protrusions 106 protrude axially opposite to the cover ring 61 of the housing cover 60. When the processing unit 14 is attached, the housing-side locking protrusions 106 are locked behind the corresponding head-side locking protrusions 46.

[0090] When mounting, the processing unit 14 is coaxially inserted into the connection side of the connection head 12 with the housing cover 60 or the covering ring 61 of the housing cover 61 first.

[0091] FIG. 11 is a partial cross-sectional view of a variant of the housing connection 100 of FIG. 10 , fixedly connected at its outer edge 63 to the cover ring 61 of the housing cover 60, for example, by welding. Advantageously, laser welding or projection welding can be used. Optionally, the connection can also be made by soldering. Advantageously, a solid, planar connection reduces the risk of the housing connection 100 breaking due to loads over its service life, such as vibration loads. In the embodiment shown in FIG. 11 , the outer edge 63 of the cover ring 61 extends upward to form the connection with the housing connection 100. The cover ring 61 also has a recess, the inner edge of which extends upward, radially inward from the outer edge 63. This allows for high rigidity of the cover ring 61. The housing connection 100 and the cover ring 61 are located in an outer region. The outer edge 63 is the region where the parts are melted and joined. Even in non-welded embodiments, the inner edge of the recess extends upward.

[0092] As shown in Figures 6 to 8, the head connection part 32 is fixed to the connection head 12 at the head assembly part 36 from the side facing the processing unit 14 using a total of three screws 52. Each of the screws 52 is disposed in the center of the circumferential part 40 and is threadedly engaged with the screw element 39 (Figure 7).

[0093] Furthermore, a pretensioning element 54 is arranged coaxially in the connection space 30. The pretensioning element 54 can be seen in detail in Figure 12. In Figures 6 and 7, the position where it is attached to the head connection part 32 can be seen. In the connection head 12, the pretensioning element 54 is arranged with a slight gap in the groove and is fixed by the screwed head connection part 32, which also fixes the open spring end of the pretensioning element 54.

[0094] The pretensioning elements 54 are designed as bent wire sections and are placed in two to five areas on the connection head 12 or the motor or vehicle side, and in two to five areas on the edge 57 of the housing pot 58 of the processing unit 14. The edge 57 of the housing pot 58 can be embodied, for example, as a crimp. The support area of ​​the pretensioning elements 54 against the edge 57 of the processing unit 14 has a straight area 55 configured to contact the edge of the housing pot 58. The contour of the outwardly extending spring arms 53 is approximately rectangular or trapezoidal. Thus, for each contact area of ​​the spring arms 53, three contact points are provided: two where each spring arm 53 intersects the edge 57 and one in the center of the straight area 55. The pretensioning elements 54 are shaped so that the spring arms 53 lie as flat as possible on the edge 57 of the housing pot 58, for example, on the crimp.

[0095] The pretensioning element 54 includes at least two, in this embodiment three, spring arms 53. The spring arms 53 are uniformly distributed around the circumference. The spring arms 53 extend in the same rotational direction relative to the connecting axis 20 as the assembly ramp 43 of the head connecting part 32. They can bend axially due to their spring elasticity.

[0096] During operation, vibrations cause a slight relative movement between the pretensioning element 54 and the edge 57. The straight region 55 allows for more uniform contact and therefore more uniform wear as well as less digging in of the pretensioning element 54. It also reduces the moment required for removal. Furthermore, it allows for scalability to different diameters of the processing unit 14, which have different masses that cause different vibration loads.

[0097] According to the embodiment of the connection head 12 of Figures 1 to 17, the circumferential wall 28 surrounds the upper part of an annular splash guard part 150. The splash guard part 150 is shown in two different views in Figures 14 and 15. Figures 16 and 17 show variants of the splash guard part 150 from the same view.

[0098] The splash guard part 150 serves to protect the functional elements 44, 104 from splashes of water and dust. The splash guard part 150 is made of vulcanized or thermoplastic elastomer (TPE) and preferably seals radially against the connection head 12 and preferably axially against the edge 57 of the processing unit 14. The pretensioning element 54 is provided with a small groove-shaped notch 156 in its bearing area against the spring arm 53. Preferably, the splash guard part 150 is held and clamped against the connection head 12 by the head connection part 32. Alternatively, the splash guard part 150 can be bonded to the connection head 12.

[0099] The connection head 12 is provided with a cylindrical shoulder 29 in the circumferential direction, which is oversized relative to the mating contour of the sealing area 164 of the splash guard part 150 so that the splash guard part 150 is arranged under pretension for improved sealing. The sealing area 164 preferably seals radially against the shoulder 29. Alternatively, in an embodiment not shown, the sealing area 164 can also be designed to seal axially.

[0100] The splash guard portion 150 has a lip 160 that protrudes circumferentially outward from the edge 57. A further lip 162 is provided inside the edge 57 for centering during installation. The lips 160, 162 preferably form a sealing area 166 that seals axially against the edge 57. The sealing area 164 has a smaller diameter than the sealing area 166. The lips 160, 162 are approximately the same axial length, but the inner lip 162 extends axially slightly further than the outer lip.

[0101] The splash guard portion 150 may also be supported by the circumferential wall 28 of the connection head 12, which further provides a barrier against water splashes and protects the splash guard portion 150 from mechanical damage.

[0102] The splash guard part 150 has an umbrella shape. In this regard, it seals against the connection head 12 on its inner circumferential side and against the edge 57 on its outer circumferential side. In the region where the spring arms 53 of the pretensioning element 54 protrude towards the edge 57, the splash guard part 150 has protrusions 152 that cover the respective spring arms 53. In this regard, in the closed state of the connection device 34, the outer straight sections 55 of the spring arms 53 of the pretensioning element 54 are received in grooves between the lips 160, 162 of the splash guard part 150. Between the sealing regions 164, 166, the splash guard part 150 has a membrane-type flexible region 159 that can be made of a relatively thin material that is thinner than the material of the sealing regions 164, 166. The increased flexibility and deformability of this region 159 facilitates the installation of the treatment unit 14 on the filter head, since smaller deformation forces and frictional moments act on the treatment unit 14 when the treatment unit 14 is installed.

[0103] The area 164 between the sealing to the connection head 12 and the area 166 for support to the edge 57 is preferably thin-walled and outwardly curved, like a membrane, for good deformability. The splash guard part 150 is pressed upwards by approximately 1 to 4 mm when the processing unit 14 is installed. Ribs 154, 158 may be provided in the inner area to further clamp the splash guard part 150. The ribs 154, 158 end at the position where the screw element 39 is located.

[0104] In the embodiment of splash guard portion 150 of Figures 16 and 17, outer lip 160 extends axially further than inner lip 162, which is disposed on edge 57 of housing pot 58 (Figure 5). When installed, outer lip 160 projects axially further than edge 57, thereby providing better shielding from water splashes hitting the sides.

[0105] The processing unit 14 is designed as a spin-on filter with a circular cross section. It is substantially coaxial with the connection shaft 20. The processing unit 14 comprises a housing 56 having a housing pot 58 and a housing cover 60 fixed at its radially outer edge to the open side of the pot by a crimp connection. A stabilizing cover ring 61 is arranged on the housing cover 60 on the connection head 12 side. The radially outer diameter of the housing 56 at the housing cover 60 is smaller than the radially inner diameter of the splash guard part 150 of the connection head 12. The housing pot 58 comprises an outwardly curved housing bottom 62. The housing cover 60 and the housing pot 58 are made of metal. Optionally, the housing cover 60 can be welded to the housing pot 58.

[0106] A coaxial filter element 64 is arranged in the housing pot 58 (FIGS. 3-5). The filter element 64 comprises a circumferentially closed filter medium that is folded to form a filter bellows 66. The filter bellows 66 is sealingly connected at its end faces to a mounting end disc 68 at the top in FIG. 1 and to a counter end disc 70 at the bottom. The mounting end disc 68 is arranged on the side of the filter element 64 facing the housing cover 60.

[0107] The filter bellows 66 surrounds an interior portion 72 of the filter element 64. The interior portion 72 is the clean side of the filter element 64.

[0108] A counter end disc 70 closes an element interior 72 at the end face of the filter element 64 facing the housing bottom 62. A plurality of spring elements 74 are supported on the outer surface of the counter end disc 70 facing the housing bottom 62, and the other end is supported by the housing bottom 62.

[0109] Counter end disc 70 may have a spring-loaded bypass valve (not shown) disposed therein which, although not critical here, when open, allows motor oil to flow directly from housing bottom 62 into element interior 72, bypassing the filter element.

[0110] The filter element 64 is surrounded radially outward by an untreated annular space 78 defined radially inward of the housing pot 58 .

[0111] Additionally, within the element interior 72, a coaxial center tube (not shown) may extend between the counter end disc 70 and the mounting end disc 68. The circumferential wall of the center tube is permeable to motor oil. The radially inner circumferential side, i.e., the radially inner folded end, of the filter bellows 66 may be supported on the radially outer circumferential side of the center tube.

[0112] The mounting end disc 68 has a coaxial outlet opening 82 for filtered motor oil. Radially inwardly, the mounting end disc 68 is formed as a coaxial cylindrical socket 83 that extends axially away from the element interior 72.

[0113] A coaxial annular inner seal unit 84 is attached to the surface of the cylinder socket 83 axially opposite to the element interior 72. The inner seal unit 84 is made of elastomer.

[0114] The inner seal unit 84 is provided with a backflow prevention membrane 86 on its radially outer side. The backflow prevention membrane 86 is annular and surrounds the cylinder socket 83 on its radially outer side. The backflow prevention membrane 86 is mechanically pretensioned against the inside of the housing cover 60 facing the filter bellows 66. As shown in FIG. 3 , in the absence of pressure, it closes a coaxial annular inlet opening 88 in the housing cover 60 for the motor oil. When motor oil is supplied to the treatment device 10, hydraulic pressure in the flow direction opens the backflow prevention membrane 86. The backflow prevention membrane 86 prevents the motor oil from flowing back through the inlet opening 88.

[0115] The radially inner annular part of the inner sealing unit 84 forms a coaxial inner annular seal 90. The inner annular seal 90 is arranged with its radially outer periphery in close contact with the radially inner periphery of the cylinder socket 83. When the treatment unit 14 is installed, the inner annular seal 90 is also arranged with its radially inner periphery in close contact with the radially outer periphery of the radially inner mounting socket 22, which is designed as a sealing surface. The inner annular seal 90 separates the clean side of the treatment unit 14 from the untreated side in the area of ​​the inlet opening 88.

[0116] The housing cover 60 includes a stepped coaxial outer seal socket 92 in the region of the inlet opening 88. A constriction at the end of the outer seal socket 92 opposite the filter bellows 66 forms an outer seal groove 94 for an outer annular seal 96. The outer annular seal 96 is configured as an O-ring.

[0117] The outer radial diameter of the outer seal socket 92 outside the area of ​​the seal groove 94 corresponds approximately to the inner radial diameter of the outer mounting socket 24 of the connection head 12. When the processing unit 14 is installed, the seal socket 92 seats in the outer mounting socket 24. Furthermore, the outer radial side of the outer seal socket 92 abuts the inner radial side of the radially outer mounting socket 24.

[0118] The outer seal groove 94 is covered by a cover ring 98 axially opposite the filter bellows 66. The cover ring 98 may be connected to the outer seal socket 92 by clamp tabs.

[0119] When the treatment unit 14 is installed, the outer annular seal 96 is placed against the radially inner circumferential side of the radially outer mounting socket 24, which is designed as a sealing surface, thereby separating the oil-conducting area of ​​the treatment device 10 from the connection space 30 and the environment. For example, the annular seal 96 is arranged at the same height as the bayonet ring, i.e., the head connection part 32 and the housing connection part 100 of the connection device 34.

[0120] At the latest when the cover ring 98 reaches the end face of the radially outer mounting socket 24 of the connection head 12 and / or when the housing connection part 100 reaches the head connection part 32, the processing unit 14 rotates further around the connection axis 20 in the clockwise direction, which is the closing rotation direction of the connection device 34.

[0121] When the free ends of the housing-side functional elements 104 are placed in the corresponding head-side insertion gaps 50, the assembly inclined portions 43 of the functional elements 44 begin to guide the housing-side slide regions 142. The spring arms 53 of the pretensioning elements 54 are axially supported at their free ends, including the straight portions 55, on the edges 57 of the housing pots 58. Due to the axial pulling action achieved by the inclined assembly portions 43 between the functional elements 44, 104 and the slope of the slide regions 142, the inner annular seal 90 is pulled toward the radially inner mounting socket 22, and the outer annular seal 96 is pulled toward the radially outer mounting socket 24.

[0122] When the housing-side locking projection 106 abuts against the corresponding head-side locking projection 46, the corresponding locking force must be overcome in order to rotate further. The locking force can be realized by the restoring force of the spring arm of the leaf spring 54.

[0123] After overcoming the locking force, the housing-side locking projection 116 locks behind the housing-side locking projection 46, thereby securing the connection device 34 from being accidentally opened.

[0124] To remove the processing unit 14 from the connection head 12, the processing unit 14 is rotated counterclockwise around the connection shaft 20, i.e., in the opening direction. For this purpose, it is first necessary to overcome the locking force between the housing-side locking projection 106 and the head-side locking projection 46.

[0125] Under the spring pretension of the pretensioning element 54, the inner support area 105 is guided along the corresponding support area 45 of the head-side functional element 44. Furthermore, the outer housing-side support area 105 is guided along the respective guide pins. As a result, an axial pressing force is generated on the outer housing-side support area 105 by the guide pins acting against the respective retaining forces of the inner annular seal 90 and the outer annular seal 96. The retaining forces are obtained by friction between the inner annular seal 90 and the inner mounting socket 22 and between the outer annular seal 96 and the outer mounting socket 24, respectively. The pressing force axially pulls the inner annular seal 90 out of the inner mounting socket 22 and the outer annular seal 96 out of the outer mounting socket 24.

[0126] After a further rotational movement, when the housing-side functional elements 104 leave the corresponding head-side insertion gaps 50, the processing unit 14 is extracted from the connection head 12 with an axial movement.

[0127] During operation of the treatment device 10, i.e., while the internal combustion engine is running, refined motor oil flows through the infeed 16 into the annular inlet space 26, as indicated by arrow 112. From there, the motor oil flows through the inlet opening 88, which is opened by the backflow blocking membrane 86, into the untreated annular space 78 of the filter housing 56. The refined motor oil flows radially from the outside to the inside through the filter bellows 66 and reaches the element interior 72 through the opening in the central tube 88. From the element interior 72, the refined motor oil flows through the outlet opening 82 and the radially inner mounting socket 22 of the connection head 12 to the drain 18. The refined motor oil exits the connection head 12 and is discharged from the treatment device 10 through the drain 18.

[0128] A second embodiment of a processing device 10 in the form of a filtration device is shown in Figures 18 to 21. Components identical to those of the first embodiment of Figures 1 to 17 are given the same reference characters. Figure 18 is an isometric view of the connection head 12 of the processing device 10, Figure 19 is an isometric view of the processing unit 14 of the processing device 10, and shows the top view of a housing connection 100 for the connection head 12 of Figure 18. Figure 20 is an isometric view of the head connection 32 of the connection head 12, and Figure 21 is an isometric view of the housing connection 100.

[0129] In this embodiment, the functions of the functional elements 44, 104 are interchanged. The housing connection 100 comprises functional elements 104 each including an assembly ramp 103 leading to a linear support surface 105 extending perpendicular to the connection axis 20.

[0130] The head connection part 32 comprises three functional elements each including a slide area 42 (FIG. 20) that connects to a corresponding support surface 45. Optionally, the functional elements 44 of the head connection part 32 may be open to the outside, as shown in FIG. 20, or may be open to the inside (not shown).

[0131] The number of functional elements 44, 104 can alternatively be four or five.

Claims

1. A treatment device (10) for a fluid, comprising: a replaceable treatment unit (14) including a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; a connection head (12) including an infeed (16) for the fluid to be treated connectable to said at least one inlet (88) and / or a drain (18) for the fluid to be treated connectable to said at least one outlet (82), the connection head (12) and the processing unit (14) are connectable to each other by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); The connection device (34) includes at least one housing connection portion (100) on the housing (56) side and at least one head connection portion (32) on the connection head (12) side, the housing connection portion (100) and the head connection portion (32) being operatively connectable to each other to create a connection of the connection device (34); the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, the pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending in a circular shape around the connecting axis (20); the spring arms (53) arranged on the connection head (12) are placed on the edges (57) of the housing pot (58), and each of the spring arms (53) forms three contact points with the edges (57), or The spring arms (53) arranged on the processing unit (14) are arranged on the edges of the connection head (12), and each of the spring arms (53) forms three contact points with the edges of the connection head (12).

2. A treatment device (10) for a fluid, comprising: a replaceable treatment unit (14) including a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; a connection head (12) including an infeed (16) for the fluid to be treated connectable to said at least one inlet (88) and / or a drain (18) for the fluid to be treated connectable to said at least one outlet (82), the connection head (12) and the processing unit (14) are connectable to each other by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); The connection device (34) includes at least one housing connection portion (100) on the housing (56) side and at least one head connection portion (32) on the connection head (12) side, the housing connection portion (100) and the head connection portion (32) being operatively connectable to each other to create a connection of the connection device (34); the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, the pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending in a circular shape around the connecting axis (20); 10. A processing device, characterized in that said connection head (12) comprises a protrusion (152) for said spring arm (53).

3. A treatment device (10) for a fluid, comprising: a replaceable treatment unit (14) including a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; a connection head (12) including an infeed (16) for the fluid to be treated connectable to said at least one inlet (88) and / or a drain (18) for the fluid to be treated connectable to said at least one outlet (82), the connection head (12) and the processing unit (14) are connectable to each other by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); The connection device (34) includes at least one housing connection portion (100) on the housing (56) side and at least one head connection portion (32) on the connection head (12) side, the housing connection portion (100) and the head connection portion (32) being operatively connectable to each other to create a connection of the connection device (34); the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, the pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending in a circular shape around the connecting axis (20); 10. The processing device, wherein the pretensioning element (54) is configured as a bent wire section.

4. A treatment device (10) for a fluid, comprising: a replaceable treatment unit (14) including a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; a connection head (12) including an infeed (16) for the fluid to be treated connectable to said at least one inlet (88) and / or a drain (18) for the fluid to be treated connectable to said at least one outlet (82), the connection head (12) and the processing unit (14) are connectable to each other by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); The connection device (34) includes at least one housing connection portion (100) on the housing (56) side and at least one head connection portion (32) on the connection head (12) side, the housing connection portion (100) and the head connection portion (32) being operatively connectable to each other to create a connection of the connection device (34); the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, the pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending in a circular shape around the connecting axis (20); At least one of the complementary functional elements (44, 104) comprises an assembly ramp (43, 103) connected to a support area (45, 105) perpendicular to the connection axis (20), and the other of the complementary functional elements (104, 44) comprises a slide area (142, 42) adjacent to a support area (105, 45) perpendicular to the connection axis (20), In the connecting end position of the connecting device (34), the two support areas (45, 105) are arranged one above the other with respect to the connecting axis (20), 10. The processing device according to claim 9, wherein each of said support regions (105, 45) is circumferentially adjacent by end stops (107, 47) that engage one behind the other, engage with one another, or mate with one another in a closed position of said at least one connecting device (34).

5. 4. The processing device according to claim 3, characterized in that one or more support areas (45, 105) are provided on at least one of the functional elements (44, 104), the total circumferential length of which occupies at least 20% of the corresponding circumference of the corresponding housing connection part (100) and / or the corresponding head connection part (32) on the same radius.

6. 6. The treatment device according to claim 1, wherein an outer annular seal (96) is arranged radially inside the housing connection (100).

7. A treatment device (10) for a fluid, comprising: a replaceable treatment unit (14) including a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; a connection head (12) including an infeed (16) for the fluid to be treated connectable to said at least one inlet (88) and / or a drain (18) for the fluid to be treated connectable to said at least one outlet (82), the connection head (12) and the processing unit (14) are connectable to each other by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); The connection device (34) includes at least one housing connection portion (100) on the housing (56) side and at least one head connection portion (32) on the connection head (12) side, the housing connection portion (100) and the head connection portion (32) being operatively connectable to each other to create a connection of the connection device (34); the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, the pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending in a circular shape around the connecting axis (20); The processing unit (14) and the connection head (12) each include at least one corresponding element that is paired with and corresponds to each other when the processing unit (14) is attached; A processing device characterized in that at least one pair of corresponding elements (22, 83) is arranged inside at least one other pair of corresponding elements (24, 29).

8. 8. Processing device according to any one of the preceding claims, characterized in that the pretensioning element (54) is fixed to the connection head (12) by the head connection part (32).

9. Processing device according to any one of the preceding claims, characterized in that the head connection (32) and / or the housing connection (100) consist of or contain sheet metal.

10. A processing unit (14) for a processing device (10) according to any one of claims 1 to 9, comprising: The apparatus comprises a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; the processing unit (14) can be connected to the connection head (12) of the processing device (10) by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); the connecting device (34) includes at least one housing connection portion (100) on the housing (56) side, the housing connection portion (100) being configured to connect the connecting device (34) to at least one head connection portion (32) on the connecting head (12) side; the at least one inlet (88) is connectable to an infeed (16) of the connection head (12) for the fluid to be treated, and / or the at least one outlet (82) is connectable to a drain (18) of the connection head (12) for the fluid to be treated, the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, The pretensioning element (54) is a spring element having at least two spring arms (53) protruding radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending circularly around the connecting axis (20).

11. 11. The processing unit according to claim 10, characterized in that the pretensioning element (54) is fixed to the housing cover (60) of the processing unit (14) by the housing connection (100).

12. 12. A processing unit according to claim 10 or 11, characterized in that the spring arms (53) are configured to be placed on an edge of the connection head (12), each of the spring arms (53) being provided with three contact points with said edge.

13. 13. The processing unit according to any one of claims 10 to 12, characterized in that the pretensioning element (54) is configured as a bent wire section.

14. the at least one housing connection (100) has at least one functional element (104), the at least one functional element (104) being operatively connectable to at least one functional element (44) of the head connection (32); said at least one functional element (104) comprising a support area (105) perpendicular to said connection axis; The processing unit according to any one of claims 10 to 13, characterized in that the at least one functional element (104) comprises an assembly ramp (103) or a slide area (142) respectively connected to a support area (105) perpendicular to the connection axis (20).

15. 15. A processing unit according to any one of claims 10 to 14, characterized in that one or more support areas (105) are provided, the total circumferential length of which occupies at least 20% of the corresponding circumference on the same radius of the housing connection part (100).

16. The housing connection (100) includes an anti-rotation device, 16. Processing unit according to any one of claims 10 to 15, characterized in that the housing connection (100) comprises at least one notch (115) on its edge as an anti-rotation device.

17. A connection head (12) to be connected to a processing unit (14) according to any one of claims 10 to 16, comprising: The treatment unit (14) comprises a housing (56) having a housing pot (58), a housing cover (60), at least one inlet (88) for the fluid to be treated, and at least one outlet (82) for the fluid to be treated; the connection head (12) of the processing device (10) can be connected to the processing unit (14) by a detachable bayonet-type connection device (34) by plugging in / rotating around the connection axis (20) of the processing device (10); the connecting device (34) includes at least one head connection portion (32) on the connecting head (12) side, the head connection portion (32) being configured to connect the connecting device (34) to at least one housing connection portion (100) on the housing (56) side; at least one infeed (16) of said connection head (12) is connectable to said at least one inlet (88) for the fluid to be treated and / or at least one drain (18) of said connection head (12) is connectable to said at least one outlet (82) for the fluid to be treated, the housing connection portion (100) and the head connection portion (32) each have at least one complementary functional element (44, 104) operatively connectable to each other in a circumferential direction around the connection axis (20); the connecting device (34) comprises at least one pretensioning element (54) for realizing a mechanical pretensioning by which the complementary functional elements (44, 104) are pressed against one another, The pretensioning element (54) is a spring element having at least two spring arms (53) projecting radially outward, each of the spring arms (53) having a straight portion (55) on its radially outer end surface, the straight portion (55) being arranged tangentially to an edge portion (57) extending circularly around the connection axis (20).

18. 18. The connection head according to claim 17, characterized in that the pretensioning element (54) is fixed to the connection head (12) by the head connection part (32).

19. 19. A connection head according to claim 17 or 18, characterized in that the spring arms (53) are configured to be placed on the edge (57) of the housing pot (58), each of the spring arms (53) being provided with three contact points with the edge (57).

20. Connection head according to any one of claims 17 to 19, characterized in that a connection head-side projection (152) for the spring arm (53) is provided.

21. Connection head according to any one of claims 17 to 20, characterized in that the pretensioning element (54) is configured as a bent wire section.

22. the at least one head connection portion (32) has at least one functional element (44), the at least one functional element (44) being operatively connectable to at least one functional element (104) of the housing connection portion (100); said at least one functional element (44) comprising a support area (45) perpendicular to said connection axis (20); A connection head according to any one of claims 17 to 21, characterized in that the at least one functional element (44) comprises an assembly ramp (43) or a slide area (42) respectively connected to a support area (45) perpendicular to the connection axis (20).

23. 23. A connection head according to any one of claims 17 to 22, characterized in that one or more support areas (45) are provided, the total circumferential length of which occupies at least 20% of the corresponding circumference on the same radius of the head connection part (32).

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