Fluid quality control components and devices

Abstract

A fluid quality control assembly for a container filled with a fluid, such as an oil container, is described. The container has a through-hole (1) within its container wall (3), wherein the through-hole includes a seat section (31). To reliably seal the through-hole during quality control, the assembly includes a rod-shaped member (10) and a plug (20) separate from the rod-shaped member. The plug has an end surface configured to be adjacent to a first end end (11a) of the rod-shaped member extending longitudinally between a first end (11) and a second end (12). Along the longitudinal direction of the rod-shaped member, the rod-shaped member includes the first end end (11a), a magnetic portion (13), and a fastening portion (14). In a fixed position, the rod-shaped member is removably secured within the through-hole of the container by its fastening portion to seal the through-hole. The magnetic portion is located between the first end cap and the fastening portion, wherein in the fixed position, the rod-shaped member is configured such that it extends longitudinally beyond the seat section, and fluid in the fluid filling of the container flows around the magnetic portion, wherein the first end cap of the rod-shaped member is engaged with the end surface of the plug, such that when the rod-shaped member is removed from its fixed position, the plug moves with the rod-shaped member to a seat position within the through hole at the seat section, wherein the plug is configured such that in the seat position, the outer surface of the plug fluid-tightly seals the through hole. Furthermore, a corresponding device is described, comprising a tubular body and such components.

Description

Technical Field

[0001] This disclosure relates to a fluid quality control assembly and apparatus for a container filled with a fluid, such as an oil-filled container, the container having a through-hole in its container wall, wherein the assembly includes a magnetic portion. Background Technology

[0002] The quality of fluids (such as oil) filling gearboxes and fuel tanks is typically checked using a magnetic rod inserted into the fluid through a drain hole in the gearbox or tank wall to inspect for metal residues. This magnetic rod attracts metal particles dispersed in the fluid. The quantity, shape, and / or size of these metal residues help assess the condition of other components of the gear or fluid system at an early stage. However, it is impossible to pull the magnetic rod out of a through-hole at the bottom of the gearbox or tank without leaking a large amount of fluid, thus causing environmental pollution. Therefore, previously, the magnetic rod could only be inspected after the gearbox or tank had been completely emptied, a time-consuming and costly process.

[0003] Document CN 205797483 U discloses an iron filings oil drain plug that can be screwed into the oil drain hole of a container. The plug has a cartridge and a magnetic core. The magnetic core includes grooved oil filter holes that adsorb dispersed iron filings in the oil. When it is necessary to remove the iron filings adsorbed by the magnetic core, the magnetic core can be rotated, allowing it to move along the longitudinal direction of the cartridge within the cartridge cavity, thereby disengaging the magnetic core from the cartridge. Removal of the magnetic core causes a rubber buffer, under the action of a pressure spring (supported and housed within the cartridge), to move along the cartridge to a position where it seals the insertion hole of the magnetic core, preventing oil leakage from the drain hole.

[0004] Such iron filings oil drain plugs cannot reliably seal the container's drain hole because iron filings may accumulate inside the cylinder, thus hindering the spring-driven movement of the buffer within the cylinder and impeding the proper positioning of the buffer at the mounting hole.

[0005] Therefore, the object of the present invention is to provide a fluid quality control component and apparatus that reliably seals the through-hole of a fluid container or tank, and that is easily removable and easily reassembled into the through-hole. Summary of the Invention

[0006] The above-mentioned problems are solved by a fluid quality control component having the features of claim 1 and a fluid quality control device having the features of claim 8.

[0007] Specifically, the aforementioned problem is addressed by a fluid quality control assembly for a container filled with fluid (i.e., a container filled with oil), the container having a through-hole within its container wall, wherein the through-hole includes a seat section. The assembly includes a rod-shaped member and a plug separate from the rod-shaped member. The rod-shaped member is used to collect metal debris dispersed in the liquid, wherein the plug facilitates sealing the through-hole when the rod-shaped member is removed for inspection and / or cleaning. Furthermore, the plug of the fluid quality control assembly has an end surface configured to be adjacent to a first end end of the rod-shaped member extending longitudinally between a first end and a second end. Along the longitudinal direction of the rod-shaped member, the rod-shaped member includes the first end end, a magnetic portion, and a fastening portion, wherein in a fixed position, the rod-shaped member is removably secured within the through-hole of the container by its fastening portion to seal the through-hole. The magnetic portion is configured to magnetically attract metal debris in the oil, wherein the magnetic portion is located between the first end end and the fastening portion. In the fixed position, the rod-shaped member is configured such that it extends longitudinally beyond the seat section into the fluid, causing the fluid in the container's fluid filler to flow around the magnetic portion to collect metal debris. A first end of the rod-shaped member engages with the end surface of the plug, such that when the rod-shaped member is removed from its fixed position (i.e., pulled outward), the plug moves with the rod-shaped member to a seated position within the through-hole at the seat section. Thus, the plug is positioned at the seated position. The connection between the rod-shaped member and the plug will be described in more detail below. Furthermore, the plug is configured such that its outer surface seals the through-hole in a fluid-tight manner at the seated position. In the seated position, the plug can be received at the seat section, and is at least partially received within the seat section. Therefore, when the rod-shaped member disengages from and is pulled out of the through-hole, the plug is driven by the movement of the rod-shaped member and is driven into its seated position. Consequently, the plug's positioning in its seated position is more reliable, and a greater initial contact pressure can be provided, resulting in a better seal against the through-hole. After the plug is in its seated position, the internal pressure of the fluid keeps the plug pressed into its seated position. Therefore, the through-hole can extend horizontally or vertically, or at any angle relative to the vertical direction, and can still be reliably sealed by the plug (in its seated position).

[0008] The fluid may be machine oil, hydraulic oil, or gear oil, for example, made from biological lubricants, mineral oil, and / or synthetic oil.

[0009] The mounting section may be a segment within a through-hole, having an inner diameter that increases or decreases relative to an adjacent segment. The mounting section may be provided by the through-hole itself, or it may be provided by another element (such as a tubular shape) fixed within the through-hole, as described in detail below.

[0010] In one embodiment, the seat segment is configured to receive a plug in its seated position, and optionally, it may provide an edge or chamfer to receive the plug.

[0011] For example, the rod-shaped member may include threads in its fastening portion, by means of which the rod-shaped member can be fastened to a corresponding thread within the through-hole of the container. Alternatively, the rod-shaped member may be removably secured within the through-hole via a bayonet connection or another shape and / or a friction-locking connection. When the rod-shaped member is secured within the through-hole of the container, the rod-shaped member is in its fixed position.

[0012] In one embodiment of the component, the first end cap includes a first connecting element, and the plug includes a second connecting element on its end surface, adjacent to the first end cap, for magnetic and / or mechanical connection. For example, if the connection between the first and second connecting elements is a purely magnetic or primarily magnetic connection, i.e., the connection between these elements is mechanically loose. For magnetic connection, the first and second connecting elements can be permanent magnets of opposite polarities. For example, the first and second connecting elements can each be in the form of a cylindrical or lens-shaped magnetic element, which can be embedded within the plug or rod-like member, respectively. Alternatively, a magnetic material can be embedded within the material of the plug. In the case of mechanical connection, each of the first and second connecting elements can include a hook and / or chain and / or rope and / or spring, wherein the first and second connecting elements can be unhooked or unchained (i.e., disconnected) to allow complete removal and / or cleaning of the rod-like member, particularly its magnetic segment. Furthermore, the first and second connecting elements are configured such that, for both connection types, the plug moves along with the rod-shaped member when the member is removed from the through-hole. In other words, the rod-shaped member actively drives the plug into its seated position to seal the through-hole.

[0013] In one embodiment of the component, the plug includes a plug body (forming an end surface for receiving an adjacent rod-like member), a recess within the end surface, and a magnetic screw with a screw head, wherein the screw is secured within the recess, and the screw head forms a second connecting element. This embodiment provides a combination of magnetic and mechanical coupling, wherein the plug contains a magnetic material at or near the recess. The rod-like member may include a pin-shaped and magnetic first end tip, the pin shape of which complements the recess on the end surface of the plug. Thus, in this embodiment, the first connecting element and the second connecting element form a shape-locking connection, wherein other types of shape-locking connections may also be used.

[0014] In one embodiment of the component, the magnetic portion of the rod-shaped member includes at least two cylindrical permanent magnets spaced at a predetermined distance in the longitudinal direction. In another example, the magnetic portion of the rod-shaped member includes three or four such cylindrical permanent magnets. This is advantageous because the magnetic field strength can be adjusted to meet the requirements of the intended purpose, such as for a specific fluid, by varying the number and size of the permanent magnets. Furthermore, the longitudinal design is a space-saving design.

[0015] In one embodiment of the component, the plug is configured such that it can move along a guide channel from a first position to its seated position, wherein the plug is in its first position when the rod-like member is in its fixed position. The guide channel provides clear definition for the movement of the plug from its first position to its seated position. The guide channel may be provided by the through-hole itself, or, as described below, the guide channel may be provided by a tubular shape disposed between the rod-like member and the through-hole.

[0016] In one embodiment of the component, the plug comprises or is made of a non-magnetic plastic material. The material is selected such that it does not dissolve or swell upon contact with a fluid (e.g., oil).

[0017] Furthermore, the aforementioned problem is solved by a fluid quality control device comprising a component according to any of the preceding claims and a tubular body surrounding the component, the tubular body being configured to be disposed between the rod-like member and the through-hole, wherein the outer surface of the tubular body has an outer fixing section configured to directly and fluid-tightly fix the tubular body to the inner surface of the through-hole, wherein the inner surface of the tubular body includes a seat section (i.e., the seat section is formed by the inner surface of the tubular body) and an inner fixing section for directly and fluid-tightly fixing at least a portion of the fastening portion of the rod-like member within the through-hole or fluid-tightly receiving it within the through-hole, wherein when the tubular body is fixed to the through-hole by its outer fixing section, the seat section is positioned closer to the inner surface of the container wall than the inner fixing section.

[0018] In one embodiment of the device, the inner surface of the tubular shape is configured such that it guides the plug when the plug is moved to its seated position by the rod-like member. Therefore, the outer diameter of the plug is set to allow the plug to move within the tubular shape and along the longitudinal direction of the tubular shape (i.e., along the longitudinal axis / length of the tubular shape).

[0019] The tubular shape provides a clearly defined seat section and guidance for the plug between its first position and its seated position. Furthermore, the tubular shape defines the distance between the plug and the rod-like member, and when the rod-like member is in its fixed position, the tubular shape partially covers and thus protects the plug. Further, the tubular shape provides the aforementioned characteristics and advantages even if the through-hole is drilled. Therefore, in one embodiment, the tubular shape covers the plug when the rod-like member is in its fixed position. In one embodiment, the tubular wall includes at least one opening, preferably located between the retaining ring and the seat section. The retaining ring will be described below. The tubular shape is configured such that when the rod-like member is in its fixed position, the plug is in its first position, allowing fluid to flow to the magnetic portion, thereby collecting metal debris there. In the seated position of the plug, the plug allows fluid to flow to the front surface of the plug opposite the seat section and prevents further outward flow of fluid. Optionally, the plug may partially cover the at least one opening in its first position and its seated position.

[0020] In one embodiment of the device, the inner diameter of the tubular body is larger than the outer diameter of the magnetic portion of the rod-shaped member. The difference between the inner diameter of the tubular body and the outer diameter of the magnetic portion provides ample space for the adsorption of metal shavings / residues at the surface of the magnetic portion.

[0021] In one embodiment of the device, the wall of the tubular body includes the at least one opening, wherein the distance between an adjacent edge of each of the at least one opening and the seat segment is equal to or greater than half the length of the plug as measured in the longitudinal direction. The distance between the seat segment and the lower edge of the at least one opening allows the plug to be reliably positioned in its seated position because the plug is laterally restrained by the sidewall of the tubular body. Furthermore, in one embodiment, the inner diameter of each of the at least one opening is smaller than the smallest of the external dimensions (e.g., length or diameter) of the plug to prevent the plug from falling out through the opening and to ensure its reliable assembly within the tubular body.

[0022] In one embodiment of the device, the tubular body includes the retaining ring on its inner surface, wherein the inner diameter of the tubular body is larger than the inner diameter of the retaining ring, and the inner diameter of the retaining ring is smaller than the outer diameter of the plug. The retaining ring is located at the end of the tubular body (along its longitudinal axis relative to the longitudinal direction of the tubular body) opposite the outer fixed section. The retaining ring prevents the plug from detaching from the tubular body and entering the container, and provides a stop position / stop surface for the plug.

[0023] In one embodiment of the device, the plug includes a tapered section at its end surface, wherein the tapered section is configured to fit snugly with a seat section at the inner surface of the tubular body when the plug is in its seated position. This design of the plug allows for a reliable seal of the through-hole when the plug is in its seated position, for example, through a form fit. Therefore, the inner diameter of the seat section is equal to the outer diameter of the plug at its tapered section. Furthermore, the slope of the tapered section allows the plug to slide smoothly into its seated position, thereby providing a secure fit. The tapered section extends laterally from the end surface of the plug adjacent to the rod-like member in the installed state.

[0024] In one embodiment of the device, a first sealing ring is provided for fluid-tightly securing the rod-shaped member within the tubular body, and / or a second sealing ring is provided for fluid-tightly securing the tubular body within the through-hole. The sealing rings provide an additional reliable seal for the container's through-hole.

[0025] While embodiments of the present invention have been illustrated and described, it should be understood that, in a broader sense, changes and modifications may be made to the present invention without departing from the invention. Attached Figure Description

[0026] The invention will now be described in more detail with reference to the illustrative accompanying drawings, in which: Figure 1An axial cross-sectional view of one embodiment of a fluid quality control device is shown, which is located in its fixed position within a through-hole of a container; Figure 2 Shown in exploded view Figure 1 The embodiments and axial sections; and Figure 3 It shows Figure 1 An axial cross-sectional view of an embodiment, wherein the plug is in the seated position. Detailed Implementation

[0027] Figure 1 and Figure 2 An embodiment of a fluid quality control device and assembly is shown, which is screwed or otherwise mounted within a through-hole 1 of a container wall 3 having an inner surface 5 and an outer surface 6, the container being filled with gear oil. The device includes a rod-shaped member 10, a plug 20, and a tubular body 30, wherein the rod-shaped member 10 and the plug 20 constitute a fluid quality control assembly according to the invention. The rod-shaped member 10 and the plug 20 are surrounded or housed by the tubular body 30. The inner surface of the tubular body provides a guiding surface for the plug 20. The tubular body 30 extends into the gear oil located above the inner surface of the container wall 3, wherein the level of the gear oil is generally higher than the protrusion of the tubular body 30 extending into the container.

[0028] The rod-shaped member 10 includes a first end 11 having a pin-shaped first end head 11a and a second end 12. Furthermore, the rod-shaped member 10 includes a magnetic portion 13 located between the first end 11 and the second end 12, but the magnetic portion 13 is closer to the first end 11 / first end head 11a. The rod-shaped member 10 further includes a threaded section 14 and a cylindrical handle section 15, wherein the handle section 15 is located at the second end 12 of the rod-shaped member 10. A user can grip the rod-shaped member 10 through the handle section 15 to screw the rod-shaped member into the tubular body 30 or remove the rod-shaped member from the tubular body 30. When screwed in, the threads of the threaded section 14 are screwed into the corresponding threads at the threaded section 32 on the inner surface of the tubular body 30. Furthermore, the rod-shaped member 10 also includes a stop surface 16 located in the longitudinal direction between the threaded section 14 and the handle section 15, thereby defining how far the rod-shaped member 10 is screwed into the tubular body 30. The device also provides a sealing ring 33 at a recess in the opposing front surface of the tubular body 30 to seal the rod-shaped member 10 against the inner cavity of the tubular body 30.

[0029] The magnetic section 13 comprises alternating magnetic segments 13a and non-magnetic segments 13b, each composed of permanent magnets. The magnetic section 13 collects metal shavings / residues dispersed within the gear oil. The outer diameter of the magnetic section 13 is approximately half the inner diameter of the tubular shape 30, thus providing a cavity between the magnetic section 13 and the inner surface of the tubular shape 30 for the gear oil and metal shavings adsorbed on the surface of the magnetic section 13. The first end portion 11a of the rod-shaped member 10 is also composed of a permanent magnetic material.

[0030] Gear oil from the container flows into the tubular shape 30 through a circular opening 35 within the tubular shape's wall, reaching the outer surface of the magnetic portion 13. The inner surface of the tubular shape includes a seat section 31. In this embodiment, the seat section 31 is formed as a step at the inner surface of the tubular shape 30. The tubular shape 30 further includes an externally threaded section 36 for screwing the tubular shape 30 into a corresponding threaded section 8 at the inner surface of the through-hole 1. Furthermore, the tubular shape 30 includes a stop surface 37 that defines how far the tubular shape 30 is screwed into the through-hole 1 and provides a surface for sealing the tubular shape 30 against another sealing ring 38 of the through-hole 1. At the end of the tubular shape 30 opposite the threaded section 36, the tubular shape 30 further includes a retaining ring 39 at its inner surface.

[0031] The plug 20 is housed within a tubular body 30 at the first end 11 of the rod-shaped member 10. The plug 20 has a generally cylindrical shape and includes a magnetic screw 22 within a corresponding recess 24 in its end surface 25. The head of the screw 22 adjacent to the first end tip 11a has opposite polarity to the first end tip 11a, so that they attract each other and cause the plug 20 to move together with the rod-shaped member 10.

[0032] exist Figure 1The rod-shaped member 10 is shown in its fixed position, where it is screwed into the corresponding threaded section 32 of the tubular shape 30 via its threaded segment 36. At the first end 11 of the rod-shaped member, the plug 20 is positioned with a magnetic screw 22 using a magnetic first end head 11a for magnetic engagement. The through-hole 1 of the container is reliably sealed by the tubular shape 30 using a sealing ring 38 and by the rod-shaped member 10 using a sealing ring 33. Metal residues dispersed in the gear oil of the container are attracted by the magnetic portion 13 and flow along the container wall 3 into the through-hole 1, then through the opening 35 into the tubular shape 30, reaching the magnetic portion 13. Here, the metal residues are collected. The outer diameter of the tubular shape 30 at its protruding end is significantly smaller than the inner diameter of the through-hole 1 so that the gear oil can easily flow into the opening 35. The longitudinal movement of the plug 20 is limited by a retaining ring 39 because the inner diameter of the retaining ring 39 is smaller than the outer diameter of the plug 20 in the section adjacent to the retaining ring 39. Furthermore, the inner diameter of the tubular body 30 is larger than the inner diameter of the retaining ring 39. Additionally, the distance between the adjacent edges of the opening 35 and the seat section 31 (see...) Figure 2 Arrow 35a in the diagram is greater than the length of plug 20 (length refers to the dimension in the longitudinal direction), so that when the plug is in its seated position (see...). Figure 3 The plug is reliably limited laterally by the tubular body 30.

[0033] To perform quality control on the gear oil, the rod-shaped member 10 is removed from the through-hole 1 by unscrewing it from the tubular body 30. For this purpose, the user holds the rod-shaped member 10 at the handle section 15. When passing through along the longitudinal direction (see...) Figure 1 As the rod-shaped member 10 is moved away (arrow 18 in the diagram), the plug 20 is driven to move in the same direction due to the magnetic connection via the first end head 11a and the screw 22. The plug 20 moves along and is guided by the inner surface of the tubular shape 30 until it reaches the seat section 31. There, due to its magnetic connection with the moving rod-shaped member 10, the plug 20 is driven to its seat position (as shown in the diagram). Figure 3 (As shown). In its seated position, the plug 20 reliably and tightly seals the through-hole 1 via its tapered section 26, the outer diameter of which is equal to the inner diameter of the seated section 31. The compressive force caused by the internal pressure of the container holds the plug 20 in place, regardless of the exact location of the through-hole 1. The through-hole may extend vertically within the container wall (e.g., ...). Figure 1 and Figure 3 (as shown), but it can also extend horizontally or in any other direction.

[0034] Users can inspect for metal residue adsorbed on the surface of the magnetic part 13 when removing the rod-shaped component 10 for quality control and to clean the rod-shaped component 10. During this process, no gear oil will leak from the container through the through-hole 1 because the plug 20 provides a tight seal.

[0035] After inspection and cleaning, the rod-shaped member 10 can be reused and screwed back into the tubular shape, thus providing a site for adsorption of metallic residues in the gear oil again. This component and device enable numerous further inspections of significant informational value. Since no fluid removal is required for these inspections, the time required is minimal.

[0036] The above embodiment uses a magnetic connection between the plug 20 and the rod-shaped member 10. Alternatively, a mechanical connection, such as a hook, chain, rope, and / or spring, can also be used similarly.

Claims

1. A fluid quality control assembly for a container for filling a fluid, such as an oil container, the container having a through hole (1) in its container wall (3), wherein the through hole includes a seat section (31), wherein the assembly includes a rod-shaped member (10) and a plug (20) separate from the rod-shaped member. The plug has an end surface configured to be adjacent to a first end head (11a) of a rod-shaped member extending longitudinally between a first end head (11) and a second end head (12), wherein, along the longitudinal direction of the rod-shaped member, the rod-shaped member includes the first end head (11a), a magnetic portion (13), and a fastening portion (14), wherein, in a fixed position, the rod-shaped member is removably secured within the through-hole of the container by its fastening portion to seal the through-hole, wherein the magnetic portion is located between the first end head and the fastening portion. In the fixed position, the rod-shaped member is configured such that it extends longitudinally beyond the seat section, and fluid in the fluid filling of the container flows around the magnetic portion, wherein the first end of the rod-shaped member is connected to the end surface of the plug, such that when the rod-shaped member is removed from its fixed position, the plug moves with the rod-shaped member to a seat position within the through hole at the seat section, wherein the plug is configured such that in the seat position, the outer surface of the plug fluid-tightly seals the through hole.

2. The component of claim 1, wherein the first end cap includes a first connecting element, and the plug includes a second connecting element (22) located on its end surface for magnetic and / or mechanical connection.

3. The assembly according to claim 2, wherein the plug (20) includes a plug body forming the end surface, a recess (24) within the end surface (25), and a magnetic screw (22) with a screw head, wherein the screw is fixed within the recess and the screw head forms the second connecting element.

4. The component according to any one of claims 2 to 3, wherein the first coupling element and the second coupling element form a shape-locking connection.

5. The component according to any one of the preceding claims, wherein the magnetic portion comprises at least two cylindrical permanent magnets (13a) having a predetermined distance between them in the longitudinal direction.

6. The component according to any of the preceding claims, wherein the plug (20) is configured such that the plug can be moved along the guide channel from a first position to a seated position of the plug, wherein the plug is in the first position of the plug when the rod member (10) is in the fixed position of the rod member (10).

7. The component according to any of the preceding claims, wherein the plug (20) comprises or is made of a non-magnetic plastic material.

8. A fluid quality control device, comprising: Components according to any one of the preceding claims; and a tubular body (30) surrounding the component, the tubular body being configured to be disposed between the rod-shaped member (10) and the through hole (1), wherein the outer surface of the tubular body has an outer fixing section (36) configured to directly and fluid-tightly fix the tubular body to the inner surface of the through hole. The inner surface of the tubular body includes the seat section (31) and the inner fixing section (32) for directly and fluid-tightly fixing or fluid-tightly accommodating at least one segment of the fastening portion (14) of the rod-shaped member (10) within the through hole (1). When the tubular body is fixed to the through hole by its outer fixing section (36), the seat section (31) is positioned closer to the inner surface (5) of the container wall (3) than the inner fixing section (32).

9. The device according to claim 8, wherein when the rod member (10) is in its fixed position, the tubular body (30) covers the plug (20), and / or, wherein the wall of the tubular body includes at least one opening (35) between the position of the retaining ring (39) and the seat section (31).

10. The apparatus according to any one of claims 8 to 9, wherein the inner surface of the tubular body (30) is configured such that the inner surface of the tubular body (30) guides the plug when the plug (20) is moved by the rod member (10) to the seat position of the plug.

11. The device according to any one of claims 8 and 10, wherein the inner diameter of the tubular body (30) is greater than the outer diameter of the magnetic portion (13) of the rod-shaped member (10).

12. The device according to any one of claims 9 to 11, wherein the distance (35a) between the adjacent edge of each of the at least one opening (35) and the seat segment (31) is equal to or greater than half the length of the plug as measured in the longitudinal direction.

13. The device according to any one of claims 8 to 12, wherein the tubular body (30) includes the retaining ring (39) on its inner surface, wherein the inner diameter of the tubular body (30) is greater than the inner diameter of the retaining ring (39), wherein the inner diameter of the retaining ring is smaller than the outer diameter of the plug (20).

14. The device according to any one of claims 8 to 13, wherein the plug (20) includes a tapered section (26) at its end surface (25), wherein the tapered section is configured to: when the plug is in the seated position, the tapered section fits tightly with the seated section (31) at the inner surface of the tubular body.

15. The apparatus according to any one of claims 8 to 14, wherein a first sealing ring (33) is provided for fluid-sealing the rod-shaped member (10) within the tubular body (30), and / or a second sealing ring (38) is provided for fluid-sealing the tubular body (30) within the through hole (1).

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