Pump device with screw plug

Abstract

The invention is based on a pump device (10) with a threaded plug (12) comprising a threaded element (14) and a base body (16) connected to the threaded element (14) and comprising a circumferentially circulating sealing element receptacle (18) for a sealing element (20). In order to provide a type of device with improved characteristics in terms of design, it is proposed that a tolerance compensation part (22) is arranged between the threaded element (14) and the sealing element receptacle (18), at least when viewed in the radial direction.

Description

[Technical Field]

[0001] The present disclosure relates to a pump device with a threaded plug. Summary of the Invention

[0002] The invention relates to a pump device according to the preamble of claim 1 . Hexagon socket screw plugs are already known from the prior art, for example as described in German standard DIN 906 or DIN 908. Hexagon head screw plugs are also known, for example as described in German standard DIN 910.

[0003] The object of the present invention is in particular to provide a pump device of this type which has improved design characteristics, in particular sealing characteristics. This object is achieved according to the invention by the features of claim 1, advantageous implementations and further developments of the invention can be gleaned from the dependent claims.

[0004] The present invention is based on a pump device comprising a screw plug, which comprises a threaded element and a base body connected to the threaded element and which has a circumferentially circulating sealing element receptacle for a sealing element.

[0005] It is proposed that a tolerance compensator be arranged between the threaded element and the sealing element receptacle, at least when viewed in the radial direction. This type of refinement allows for improved design and advantageously increased efficiency. The efficiency can be increased, preferably in terms of product and / or work input and / or production and / or cost efficiency. Additionally, such a sealing receptacle for the sealing element can improve the sealing of the pump device, and the screw plug can provide a secure closure of the recess of a pump component of the pump device. This can also improve comfort, particularly ease of installation and / or production. Furthermore, the tolerance compensator compensates for tolerances, particularly manufacturing tolerances, in particular deviations in the material thickness of the screw plug and / or pump component, particularly the recess into which the screw plug can be screwed and / or removed, thus reducing costs, particularly production and / or installation costs, and lowering costs in terms of material and / or installation and / or production costs. The tolerance compensation advantageously allows a perfect seal to be provided when the screw plug is screwed into the recess, even if the recess, in particular the chamfer of the threaded hole of the recess, is made too large. Furthermore, the screw plug is preferably multi-usable, in particular together with the sealing element.

[0006] "Pump device" is intended to be understood to mean a component, in particular a functional component, in particular a structural and / or functional component, of a pump. In particular, the pump device may include the entire pump.

[0007] In particular, the screw plug has a tolerance compensation part. The tolerance compensation part is preferably connected to the base body, in particular integrally. Preferably, the tolerance compensation part is formed integrally with the base body. The fact that at least one first element is "connected" to at least one other element is intended to be understood to mean that the first element is advantageously connected to the further element by at least one force-fit connection and / or at least one form-fit connection, for example by riveting, and / or by a latch connection, and / or by a tongue-and-groove connection, and / or by a clamp connection, and / or by another connection that appears convenient to those skilled in the art. Alternatively and / or additionally, the element can be connected to the other element in an integrally joined manner, for example by a welding process, an adhesive process, an injection molding process, and / or another process that appears convenient to those skilled in the art. The term "integrally" is intended to be understood to mean connected in at least an integrally joined manner, for example by a welding process, a bonding process, an injection molding process, and / or another process that appears convenient to a person skilled in the art, and / or formed integrally, advantageously from a single blank, for example by production from a casting and / or by production in a single-component or multi-component injection molding process. Advantageously, integrally should be understood to mean integrally. The term "integrally" should be understood to mean formed integrally. Preferably, this single piece is produced from a single blank, ingot, and / or casting, particularly preferably in an injection molding process, in particular a single-component and / or multi-component injection molding process.

[0008] In particular, the pump device has a sealing element. The sealing element may optionally be part of a screw plug. The sealing element may be, for example, a flat seal and / or a ring seal, preferably an O-ring seal. In particular, the sealing element at least substantially corresponds to the implementation described in standard ISO 3601. The sealing element may be at least partially, predominantly, or completely made of plastic and / or rubber, such as FKM, NBR, EPDM, and / or FFKM, and / or composite materials. For example, the term "predominantly" is intended to be understood to mean at least 55% by volume and / or mass, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85%, and particularly advantageously at most 99%. The sealing element receptacle may be designed as a groove circumferentially circulating around the base body. Advantageously, the sealing receptacle forms an O-ring sealing element receptacle. The sealing element may be replaceable. The sealing element may be insertable, particularly reversibly, into the sealing receptacle. In this context, "at least substantially" is intended to be understood to mean that the deviation from the given value deviates from the given value by, in particular, less than 25%, preferably less than 10%, particularly preferably less than 5%.

[0009] The screw plug can be made at least partly or predominantly or completely from mineral and / or plastic and / or metal, advantageously from rust-free material, preferably from rust-free A4 stainless steel, in particular from A4-70 stainless steel, and / or from a composite material.

[0010] "Configured to" is intended to be understood to mean specially programmed, designed, and / or equipped. The fact that an object is configured for a particular function is intended to be understood to mean, in particular, that the object fulfills and / or performs this particular function in at least one application and / or operating state.

[0011] It is further proposed that the tolerance compensation portion be realized as part of the base body and at least partially define the sealing element receiving portion. In particular, the tolerance compensation portion is formed integrally with the base body. For example, the tolerance compensation portion can define the sealing element receiving portion at least with respect to a circumferentially circulating surface, in particular with respect to at least two circumferentially circulating surfaces. Preferably, the tolerance compensation portion defines the sealing element receiving portion at least in the direction of the screw axis of the screw plug. In particular, the tolerance compensation portion provides a stop for the sealing element. This type of refinement makes it possible to achieve an improved design and increase efficiency. In addition, the sealing element receiving portion can therefore receive the sealing element particularly advantageously, and the sealing element can be attached to the sealing receiving portion in a particularly stable position. As a result, product and / or labor and / or production and / or cost efficiency can be increased, and production and / or installation costs can be reduced.

[0012] To further improve the design, it is proposed that the tolerance compensation portion extends circumferentially around the threaded element, at least substantially perpendicular to the threaded element. In particular, the tolerance compensation portion has a rotationally symmetrical shape. Preferably, the tolerance compensation portion has an at least substantially circular cross section. In this context, "at least substantially" is intended to be understood as meaning that the deviation from the predetermined value deviates from the predetermined value by, in particular, less than 25%, preferably less than 10%, and particularly preferably less than 5%. This results in a particularly efficient compensation of the tolerance. In addition, production and / or installation costs can be reduced, and costs in terms of material and / or installation and / or production costs can be lowered. In addition, a particularly advantageous sealing performance can be achieved by the sealing element. In addition, a full circumferential stop can be provided for the sealing element.

[0013] It is also proposed that the threaded element has a standard external thread. In particular, the standard external thread is realized as a standardized external thread. For example, the threaded element can have a tapered pipe thread or a metric fine thread. Preferably, but not exclusively, the threaded element can have a cylindrical Whitworth pipe thread according to DIN 259. It is conceivable that the threaded plug is compatible with threaded plugs according to DIN 908, DIN 910 and / or VSTI. Such an embodiment can advantageously achieve a particularly high compatibility and further improve the design. Furthermore, such an implementation can allow a high degree of flexibility, in particular with regard to the intended use of the threaded plug.

[0014] It is further proposed that the inner diameter of the sealing element receiving portion is substantially larger than the nominal diameter of the threaded element. In particular, the nominal diameter of the threaded element is the nominal diameter of a standard thread of the threaded element. The inner diameter of the sealing element receiving portion is, in particular, the largest inscribed circle passing through the sealing element receiving portion. Preferably, the inner diameter is the inner diameter of the O-ring sealing element receiving portion. The term "substantially larger" than the nominal diameter of the threaded element is intended in this context to be understood to mean that the inner diameter of the sealing element receiving portion is at least 3%, advantageously at least 5%, preferably at least 6%, particularly preferably at most 10% larger than the nominal diameter of the threaded element. Preferably, the inner diameter of the sealing element receiving portion, in particular the O-ring sealing element receiving portion, depends on the nominal size of the screw plug, in particular the nominal diameter of the threaded element. For example, the inner diameter of the sealing receptacle may be at least 0.5 mm, or at least 1 mm, or at least 2 mm larger than the nominal diameter of the threaded element. This can result in a particularly advantageous design with improved properties, especially with regard to sealing. Any drawbacks that lead to an unstable or leaky connection between the screw plug and the pump component of the pump device can thus be minimized, and preferably eliminated. Such dependence of the inner diameter of the sealing element receptacle on the nominal diameter of the threaded element can result in optimal sealing, and the sealing element inserted into the sealing element receptacle provides a favorable seal even if the recess, especially the chamfer of the threaded hole of the recess, is oversized. Additionally, advantageous properties regarding tolerance compensation can be achieved.

[0015] It is further proposed that the outer diameter of the base is substantially larger than the outer diameter of the sealing element receiving portion. In particular, the outer diameter of the base corresponds to the smallest circle inscribed by the base. For example, the outer diameter of the base is at least 0.5 mm or at least 1 mm larger than the outer diameter of the sealing element receiving portion. In particular, when the standard thread has a size of at least G1 inch pipe thread, the outer diameter of the base is at least 2 mm larger than the outer diameter of the sealing element receiving portion. This further improves the design and achieves advantageous stability. In addition, it can result in a particularly efficient sealing of the design.

[0016] In addition, it is proposed that the base body has an outer region, which, when viewed in the radial direction, is arranged outside the sealing element receiving portion and at least partially defines the sealing element receiving portion. For example, the outer region can define the sealing element receiving portion at least with respect to a circumferentially circumferential surface, in particular with respect to at least two circumferentially circumferential surfaces. The outer surface can define the sealing element receiving portion at least with respect to a circumferentially circumferential surface arranged opposite the tolerance compensating portion. Advantageously, the sealing element receiving portion is arranged between the tolerance compensating portion and the outer region, in particular in a cross-sectional view along the thread axis of the screw plug. Preferably, the outer region defines the sealing element receiving portion at least in a direction away from the thread axis of the screw plug. In particular, the outer region provides a stop for the sealing element. In particular, the outer region is an outer volume region of the base body. In particular, the outer region is at a greater radial distance from the thread axis than the tolerance compensating portion, in particular than the sealing element receiving portion. This type of refinement makes it possible to achieve an improved design. Furthermore, the sealing element receiving portion can therefore receive the sealing element in a particularly advantageous manner, and the sealing element can be mounted in a particularly stable position within the sealing element receiving portion.

[0017] To further improve the design and increase efficiency, it is proposed that the pump device have a pump component with a recess, particularly a service connection, for fluid- and / or gas-tightly connecting at least one first spatial region with at least one second spatial region, where the recess for fluid-tight and / or gas-tight sealing of the first spatial region from the second spatial region is configured to receive at least a screw plug. In particular, the recess of the pump component may be realized, for example, but not limited to, as a service connection that at least allows fluid exchange, cleaning, and / or maintenance of at least one pump component. Alternatively and / or additionally, the screw plug may be configured to seal out gas, such as air. For example, the first spatial region may be designed as a first functional space of the pump. It is also conceivable that the first spatial region is the environment of the pump, particularly the environment of the pump component, and the screw plug seals off the second spatial region of the pump, for example, designed as a functional space, from the pump environment. Thus, the recess of the pump component may be closed, preferably completely sealed, by the screw plug.

[0018] In a further embodiment of the present invention, it is proposed that the pump component has a contact surface for the sealing element, and the recess has an internal thread region for the threaded element and a chamfer connecting the contact surface to the internal thread region. This can further improve the design and increase efficiency, particularly with respect to product and / or labor and / or production and / or installation and / or removal efficiency. Furthermore, it can provide simple, fast, and practical installation and / or removal, thereby reducing costs, particularly installation and / or removal costs. Additionally, the contact surface for the sealing element can improve sealing, thus providing a reliable, preferably complete, sealing design. Additionally, the sealing element can be arranged in a stable position in the installed state, particularly surrounded by the sealing element receiving portion and the contact surface. In particular, the recess has a thread, particularly an internal thread, corresponding to the screw plug, and the thread is particularly a corresponding standard thread, particularly a corresponding standard internal thread. The screw plug can be screwed into and / or removed from the recess along the internal thread region by the threaded element. In the installed state, the sealing element can at least partially, preferably completely, abut the contact surface. The contact surface and the sealing element receiving portion can at least partially, preferably completely, surround the sealing element in the installed state. In particular, the screw plug is screwed into the recess in the installed state, in particular by means of a threaded element. Advantageously, in the installed state, the screw plug is connected to the pump component with at least a force fit and / or a form fit. Preferably, the sealing element seals at least one area between the contact surface and the screw plug, in particular the sealing element receiving portion.

[0019] It is further proposed that the recess has a recessed area that at least partially forms the contact surface. In particular, the recessed area at least partially receives the screw plug in the installed state. In particular, the recessed area is realized as a flat and / or flat recessed area. In particular, the recess of the recessed area has a diameter that is larger than the diameter of the outer area of ​​the base body. This allows for further design improvements, especially with regard to sealing. In addition, this allows for an advantageously space-saving installation of the screw plug, and therefore reduces costs, especially installation costs.

[0020] Additionally, it is proposed that the tolerance compensator be configured to compensate for a manufacturing tolerance of at least one manufacturing dimension of the chamfer. For example, the chamfer may be oversized within a tolerance range, and the tolerance compensator compensates for said tolerance range. The tolerance compensator compensates for a tolerance range in which the sealing element receiving portion, and thus in particular the sealing element, is moved radially outward by the tolerance compensator. This ensures sealing contact between the sealing element and the pump component despite an incorrectly, in particular oversized, manufactured chamfer, thus advantageously improving the design. The tolerance compensator advantageously positions the sealing element on a larger diameter.

[0021] To further improve the design, it is proposed that the tolerance compensator is configured to compensate for tolerances related to the installation of the sealing element. For example, the sealing element may be positioned incorrectly during installation. The tolerance compensator compensates for this, in particular by forcing the sealing element into the correct position during screwing. This prevents slipping and / or jamming of the sealing element. Furthermore, this can improve sealing.

[0022] Particularly advantageous properties in terms of design, in particular in terms of sealing, can be achieved by a pump comprising at least one pumping device. Furthermore, a method is proposed for producing a pump device with a screw plug, the screw plug having a threaded element and a base body connected to the threaded element and a circumferentially circulating sealing element receptacle for a sealing element, wherein a tolerance compensator is arranged between the threaded element and the sealing element receptacle, at least when viewed in the radial direction. Such a production method advantageously improves efficiency and design, preferably with respect to product and / or labor and / or production and / or cost efficiency. Furthermore, the tolerance compensator compensates for tolerances, in particular manufacturing tolerances, in particular deviations in material thickness of the screw plug and / or pump components, in particular recesses into which the screw plug can be screwed and / or removed, thus reducing costs, in particular production and / or installation costs, and lowering costs with respect to material and / or installation and / or production costs.

[0023] The pumping device and / or pump according to the present invention is not limited to the applications and embodiments described herein. The pumping device and / or pump according to the present invention may, in some cases, have a different number of individual elements, components, and parts than those specified herein to achieve the functions described herein. In addition, for ranges of values ​​specified herein, values ​​within the specified limits should also be considered disclosed and usable as needed.

[0024] Further advantages will become apparent from the following description of the drawings, which illustrate exemplary embodiments of the present invention. The drawings, detailed description, and claims include numerous feature combinations. Those skilled in the art will conveniently consider these features individually and combine them into meaningful further combinations. [Brief explanation of the drawings]

[0025] [Figure 1] 1 shows a pump with a pumping device in a simplified cross-sectional view. [Figure 2] 1 shows a simplified cross-sectional view of a screw plug of a pump device. [Figure 3]3 shows a detailed view of the screw plug with the base and the sealing element receptacle according to FIG. 2. [Figure 4] 1 shows a simplified top view of a screw plug. [Figure 5] 1 shows a sealing element of a pump device in a simplified cross-sectional view. [Figure 6] 1 shows a simplified cross-sectional view of a pump component of a pump having a recess; [Figure 7] 1 shows a simplified cross-sectional view of a screw plug in an installed state in a recess. [Figure 8] 8 shows a detailed view of the screw plug with tolerance compensation in the mounted state according to FIG. 7. [Figure 9] 1 shows a further detailed view of the screw plug with tolerance compensation. [Figure 10] 1 shows a flow diagram of a method for producing a pump device. DETAILED DESCRIPTION OF THE INVENTION

[0026] In the following, only one of the objects in the figures will be referenced in each case. Furthermore, the figures are schematic and not to scale. 1 shows in cross section a portion of a pump 52 comprising a pumping device 10. The pumping device 10 has a screw plug 12. In particular, the exact implementation of the screw plug 12 may vary with respect to standards. Intended uses other than those shown here may also be envisaged.

[0027] In the present exemplary embodiment, the pump device 10 comprises a pump component 36 having a recess 38. The recess 38 is here designed as a service connection. The recess 38 fluidically and / or gaseously connects the first spatial region 40 to at least one second spatial region 42. In the present exemplary embodiment, the recess 38, which is realized as a hole, connects the environment 56 of the pump 52 to the interior of the pump 52 (see FIG. 1 ). The recess 38 is configured to receive at least the screw plug 12, thereby sealing the first spatial region 40 fluid-tight and / or gas-tight from the second spatial region 42.

[0028] The screw plug 12 has a threaded element 14. In addition, the screw plug 12 has a base 16 connected to the threaded element 14. The base 16 connected to the threaded element 14 has a circumferentially circulating sealing element receptacle 18 for a sealing element 20 (see also Figures 2 to 5). The sealing element 20 is shown separately in Figure 5. In the present case, the sealing element 20 is embodied as an O-ring seal.

[0029] An inner diameter 26 of the sealing element receiving portion 18 is substantially larger than a nominal diameter 28 of the threaded element 14. An outer diameter 30 of the base 16 is substantially larger than an outer diameter 32 of the sealing element receiving portion 18 (see FIG. 2).

[0030] The pump component 36 has a contact surface 44 for the sealing element 20, and the recess 38 has an internal thread region 46 for the threaded element 14 and a chamfer 48 connecting the contact surface 44 to the internal thread region 46 (see, for example, Figures 8 and 9). The recess 38 has a recessed region 50 that at least partially forms the contact surface 44. The recessed region 50 is realized as a flat recessed region. The contact surface 44 is oriented perpendicular to the screw axis 54 (see Figures 8 and 9).

[0031] In this exemplary embodiment, the screw plug 12 is formed from a rust-free material, specifically, from rust-free A4 stainless steel, preferably A4-70 stainless steel.

[0032] When viewed in the radial direction, the tolerance compensating portion 22 of the screw plug 12 is arranged between the threaded element 14 and the sealing element receiving portion 18. The tolerance compensating portion 22 is realized as part of the base body 16. The tolerance compensating portion 22 partially defines the sealing element receiving portion 18. In particular, the tolerance compensating portion 22 defines the sealing element receiving portion 18 at least in the direction of the thread axis 54 of the screw plug 12. The tolerance compensating portion 22 extends circumferentially around the threaded element 14, perpendicular to the threaded element 14 (see Figures 2, 3 and 7 to 9).

[0033] The threaded element 14 has a standard external thread 24. In this exemplary embodiment, the threaded element 14 has a cylindrical Whitworth pipe thread according to standard DIN 259, but is not limited to this.

[0034] The base body 16 has an outer region 34 disposed radially outward of the sealing element receiving portion 18. The outer region 34 partially defines the sealing element receiving portion 18. Specifically, the outer region 34 defines the sealing element receiving portion 18 in a direction away from the thread axis 54.

[0035] The tolerance compensating portion 22 is configured to compensate for manufacturing tolerances in at least one manufacturing dimension of the chamfered portion 48 (see FIGS. 7 to 9). In addition, the tolerance compensating portion 22 is configured to compensate for tolerances related to the installation of the sealing element 20. The tolerance compensating portion 22 specifically ensures sealing contact between the sealing element 20 and the contact surface 44.

[0036] 9 shows, by way of example, an over-manufactured chamfer 48. Even in the case of the over-manufactured chamfer 48 shown here by way of example, the tolerance compensation 22 ensures a sealing contact between the sealing element 20 and the contact surface 44.

[0037] 2 to 6 respectively show dimensional diagrams of the individual components of the pump device 10, with FIGS. 2 to 5 showing the dimensions of the screw plug 12 and the sealing element 20, while FIG. 6 shows the dimensions of the recess 38 of the pump component 36. In this exemplary embodiment, the screw plug 12 has a standard G½ inch thread. However, other sizes of the screw plug 12 and the corresponding recess 38 are of course conceivable, so some of the dimensions in the dimensional diagrams have been replaced by corresponding substitutes, i.e., letter notations. The following two tables (Table 1 and Table 2) specifically show the dimensions of the screw plug 12 and the sealing element 20 (Table 1) and the dimensions of the recess 38 of the pump component 36 (Table 2) according to the thread size and collar size of the screw plug 12.

[0038] Several sizes are shown as examples. d3 is the inner diameter 26 of the sealing element receiving portion 18, d2 is the nominal diameter 28 of the threaded element 14, d4 is the outer diameter 32 of the sealing element receiving portion 18, and d5 is the outer diameter 30 of the base 16. From both Table 1 and Figure 2, it can be seen that the inner diameter 26 of the sealing element receiving portion 18 is substantially larger than the nominal diameter 28 of the threaded element 14. Furthermore, the outer diameter 30 of the base 16 is substantially larger than the outer diameter 32 of the sealing element receiving portion 18.

[0039] Furthermore, d01 refers to the inner diameter of the sealing element 20, and d02 refers to the cord diameter of the sealing element 20 (see FIG. 5).

[0040] [Table 1]

[0041] [Table 2]

[0042] 9 shows a flow diagram of a method 100 for producing the pump device 10. The method for producing the pump device 10 can include several method steps and / or partial method steps. In a first method step 102, a screw plug 12 is provided which comprises a threaded element 14 and a base body 16 connected to the threaded element 14 and having a circumferentially circulating sealing element receptacle 18 for a sealing element 20.

[0043] In a further method step 104, the tolerance compensator 22 is arranged, at least visually, between the threaded element 14 and the sealing element receiver 18. Method step 102 and the further method step 104 can be performed in any order. [Explanation of symbols]

[0044] 10 Pumping equipment 12 Screw cap 14 Threaded Elements 16 Base 18 Sealing element receiving part 20 Sealing Elements 22 Tolerance compensation section 24 standard male thread 26 Inner diameter 28 nominal diameter 30 Outer diameter (base) 32 Outer diameter (sealing element receiving part) 34 Outer area 36 Pump Components 38 Recess 40 First Spatial Region 42 Second Spatial Region 44 Contact surface 46 Female thread area 48 Chamfered part 50 depression area 52 Pump 54 Screw axis 56 Environment 100 ways 102 Method Steps 104 Method Steps

Claims

1. A pump device (10) comprising a threaded plug (12), the threaded plug (12) comprising a threaded element (14) and a base body (16) connected to the threaded element (14), and a circumferentially circulating sealing element receptacle (18) for a sealing element (20), wherein a tolerance compensation part (22) is arranged between the threaded element (14) and the sealing element receptacle (18), at least when viewed in the radial direction, a pump component (36) having a recess (38) for fluid- and / or gas-tightly connecting at least one first spatial region (40) with at least one second spatial region (42), said recess (38) for fluid-tight and / or gas-tight sealing of said first spatial region (40) with respect to said second spatial region (42) being configured to receive at least said screw plug (12); the pump component (36) has a contact surface (44) for the sealing element (20), the recess (38) has an internal thread area (46) for the threaded element (14), and has a chamfer (48) connecting the contact surface (44) to the internal thread area (46); A pump device (10), characterized in that the tolerance compensator (22) is configured to compensate for manufacturing tolerances of at least one manufacturing dimension of the chamfer (48).

2. 2. The pump device (10) according to claim 1, characterized in that the tolerance compensation portion (22) is realized as part of the base body (16) and at least partially defines the sealing element receiving portion (18).

3. 3. The pump device (10) according to claim 1 or 2, characterized in that the tolerance compensation portion (22) extends circumferentially around the threaded element (14) at least substantially perpendicular to the threaded element (14).

4. 3. The pump device (10) according to claim 1 or 2, characterized in that the threaded element (14) has a standard external thread (24).

5. 3. The pump device (10) according to claim 1 or 2, characterized in that the inner diameter (26) of the sealing element receiving portion (18) is substantially larger than the nominal diameter (28) of the threaded element (14).

6. 3. A pump device (10) according to claim 1 or 2, characterized in that the outer diameter (30) of the base body (16) is substantially larger than the outer diameter (32) of the sealing element receiving portion (18).

7. 3. The pump device (10) of claim 1 or 2, characterized in that the base body (16) has an outer region (34) that, when viewed radially, is arranged outside the sealing element receiving portion (18) and at least partially defines the sealing element receiving portion (18).

8. 3. The pump device (10) according to claim 1 or 2, characterized in that the recess (38) has a recessed area (50) that at least partially defines the contact surface (44).

9. 3. The pump device (10) according to claim 1 or 2, characterized in that the tolerance compensator (22) is configured to compensate for tolerances relating to the installation of the sealing element (20).

10. A pump (52) comprising at least one pumping device (10) according to claim 1 or 2.

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