System for clamping an immersion tube of a can pump in an end tube sleeve

Abstract

The invention relates to a tank unit (1) comprising at least one tank (2) and a tank pump (3) which is immersed in or dipped into the tank (2), which tank pump (3) is preferably in the form of an eccentric screw pump (4) with an immersion tube (5), which preferably extends down to the deepest extraction point of the tank (2), an end sleeve (6) is fastened at the deepest extraction point of the tank (2), the immersion tube (5) is at least partially pushed into it, at least one, preferably a plurality of clamping bodies (7) are provided in the region of the free end (15) of the immersion tube (5), preferably on a support ring (17) at the free end (15) of the immersion tube (5). The tank unit (1) is characterized in that at least one clamping body (7) is designed with at least one wedge-shaped portion (8) in its relaxed position, which wedge-shaped portion extends into the radial gap (9) between the end sleeve (6) and the free end (15) of the immersion tube (5) during the pushing of the free end (15) of the immersion tube (5) into the end sleeve (6), and at least one clamping body (7) is designed so that it rotates during the complete pushing of the free end (15) of the immersion tube (5) into the end sleeve(6), so that the free end (15) of the immersion tube (5) is clamped in the end sleeve (6).

Description

Technical Field

[0001] This invention relates to a tank unit having a tank pump, the tank pump comprising an impregnation tube, the free end of which is clamped in an end sleeve by means of a clamping body according to the foregoing portion of claim 1. The invention also relates to a corresponding tank pump according to the foregoing portion of claim 11, and to a method for securing the impregnation tube or its free end in an end sleeve according to the foregoing portion of claim 13. Technical Background

[0002] In many technical fields, tanks are used to store and / or temporarily store fluids; primarily for storing and / or carrying within them. To enable the fluid to be drained from the tank again and / or to be supplied back into it, a pump is typically used, with its pumping action preferably directed to the bottom of the tank. Thus, the fluid can be drained from and / or supplied to the tank in a defined and controlled manner.

[0003] Especially for larger tanks, tank pumps with connected long immersion tubes are suitable, wherein the immersion tubes can be designed so that their free ends reach or at least approach the bottom or reach the desired deepest extraction point of the tank. Eccentric screw pumps are used as tank pumps when handling tank contents consisting of fluids containing solids with viscosity ranging from low to very high. Eccentric screw pumps are also suitable for corrosive or abrasive media. Tank pumps suitable for this purpose are designed as eccentric screw pumps with immersion tubes, wherein at least the stator of the eccentric screw pump is preferably continuously immersed in the immersion tubes until the free ends of the immersion tubes. Therefore, the motor of the tank pump does not need to be inserted into the tank or the fluid in the tank, or only partially inserted, which naturally brings various advantages, such as improved accessibility and fewer protective measures to prevent fluid ingress. Such tank pumps with immersion tubes in the form of eccentric screw pumps are shown in Figures 1 and 2. Figure 1 shows the complete tank unit 1, from which the full-length tank pump 3 can also be seen. Figure 2 shows only the cross-section of the free end of the impregnating tube in its state of being pushed into the end sleeve 6.

[0004] The motor 102 of the tank pump 3 (see Figure 1) is arranged outside the tank 2, preferably above the tank 2. The impregnation tube 5 is directly or indirectly connected to the motor itself, and the impregnation tube 5 is preferably designed as a multi-piece tube. In the example shown, the stator 4 of the eccentric screw pump driven by the motor 102 is located in the impregnation tube 5. The stator 4 of the eccentric screw pump preferably extends to the free end 15 of the impregnation tube 5.

[0005] Especially when the eccentric screw pump is used as the immersion pump, the free end 15 of the immersion tube 5 must be fastened at the desired deepest extraction point of the tank, preferably at the bottom of the tank 2.

[0006] For this purpose, an end sleeve 6 is typically used, which is itself fixed at the desired deepest extraction point in the tank 2, and the free end 15 of the immersion tube 5 is at least partially inserted into the end sleeve 6. The end sleeve 6 and the inserted free end 15 of the immersion tube 5 are also shown in Figures 1 and 2.

[0007] It should be noted here that the impregnation tube 5 in Figure 2 is at least partially formed by the stator housing 21 of the eccentric screw pump. This is shown only as an example. Generally, the stator housing 21 does not even need to be segmented to form the impregnation tube. This is also possible and often advantageous if the stator housing is surrounded by an external impregnation tube (which is preferably substantially in the form of a tube).

[0008] With the aid of the end sleeve 6, the impregnation tube 5 is quasi-"clamped," which firstly prevents the free end 15 of the impregnation tube 5 from vibrating due to the rotational motion of the rotor of the eccentric screw pump, thus preventing damage to the tank pump 3 and / or the motor 102 of the tank pump 3 from the resulting high dynamic forces. In addition, this clamping also prevents the free end 15 of the impregnation tube 5 from deflecting in an unstable manner.

[0009] As mentioned, the impregnation tube 5 itself is often designed as a multi-piece piece due to its sometimes long length, wherein the lower part of the impregnation tube is often subjected to additional support from one or more support rings 17 having support posts 20. These support posts, which are clamped to the support rings 17 at the free end 15 of the impregnation tube 5, are also shown in Figure 1.

[0010] Existing technology

[0011] However, the described method of "inserting" the free end 15 of the impregnation tube 5 into the end sleeve 6 is generally very difficult and cumbersome, and can often be described as "penetrating".

[0012] Because the end sleeve 6 is usually located in a hard-to-see area, due to the length of the impregnating tube 5 and the poor accessibility of the end sleeve 6, and also because there may be contamination on the free end 15 of the impregnating tube 5 or the end sleeve 16, and due to tolerances introduced by manufacturing techniques, it is difficult to insert the free end 15 of the impregnating tube 5 into the end sleeve 6 for a variety of reasons. However, even if the free end 15 of the impregnating tube 5 is successfully inserted into the end sleeve 6, the support at that point is often not satisfactorily achieved.

[0013] Currently, it is common practice to attach a circular sealing ring retainer 101 to the free end 15 of the impregnation tube 5, for example. This is illustrated as an example in Figure 2. The circular sealing ring 103 is circumferentially guided in the circular sealing ring retainer 101, wherein a portion of the circular sealing ring 103 naturally protrudes from a circumferential groove in the circular sealing ring retainer 101. This portion protruding from the groove thus serves to fill the radial gap between the circular sealing ring retainer 101 and the end sleeve 6. For this purpose, when the free end 15 of the impregnation tube 5 is inserted into the end sleeve 6, the circular sealing ring 103 elastically deforms, which on the one hand results in a certain tolerance compensation in the aforementioned annular gap. On the other hand, a form-fit connection is formed here between the circular sealing ring retainer 101 and the end sleeve 6. The disadvantages of this insertion method are obvious. The circular sealing ring 103 is more of a damper and is only suitable to a limited extent for achieving the desired fixation. The tolerances are compensated for here only to a limited extent by elastic deformation, since only a small portion of the circular sealing ring 103 protrudes from the groove, and its insertion into the end sleeve 6 is not significantly easier. Furthermore, there is always a risk of plastic deformation of the circular sealing ring 103 due to shearing during insertion or due to material aging. Additionally, the very soft support generates vibration, leading to increased wear on components (especially the tank pump 3), which in turn results in a significantly larger design for the entire system, particularly the tank pump 3 (especially its motor).

[0014] Another current practice for connecting the free end 15 of the impregnation tube 5 to the end sleeve 6 is by means of a polytetrafluoroethylene (PTFE) gasket. The PTFE gasket, similar to a circular seal, is attached to the free end 15 of the impregnation tube 5, undergoing quasi-cold deformation during insertion into the end sleeve 6, and thus compensating for the tolerance of the annular gap between the end sleeve 6 and the impregnation tube 5. Of course, in this case, a significantly greater force must be applied during insertion, and the resulting bearing is significantly stiffer than that of a circular seal. However, in this case, the bearing is generally too stiff to produce only a very small damping effect. Furthermore, this type of connection can only be disassembled very difficultly, making access to the system after the tank pump 3 is installed more difficult, especially for maintenance.

[0015] Therefore, it can generally be said that vibrations are generated during the operation of a vertically installed tank pump 3, which are applied to the tank, building, and pump system itself. Due to field installation tolerances (particularly deviations in coaxiality and alignment angles) from the end sleeve 6 to the impregnated tube 5, a corresponding compensating potential must also be provided for the tank pump 3 or its impregnated tube 5. A completely fixed connection between the end sleeve 6 and the impregnated tube 5 is not feasible due to maintenance requirements of the tank pump 3 and accessibility of the tank 2. Existing solutions often make it difficult to easily insert the impregnated tube 5 into the end sleeve 6; furthermore, bearings formed in this way are often either too stiff or too soft. This results in the entire system often being either too stiff to reduce vibration or too soft to easily insert the end sleeve 6 or compensate for the tolerances of the annular gap between the end sleeve 6 and the impregnated tube 5.

[0016] Basic tasks

[0017] Therefore, the object of the present invention is to provide a device that helps to securely fix the impregnated tube in the end sleeve.

[0018] Solution according to the invention

[0019] According to the present invention, this problem is solved by the features of the first independent claim.

[0020] For this purpose, a tank unit is proposed, comprising at least one tank and a tank pump immersed in or submerged in the tank (i.e., extending from the top side of the tank). As already mentioned, "tank" is understood to mean a storage and / or intermediate storage vessel for liquids with or without solids content, or, in a further but less preferred sense, a storage and / or intermediate storage vessel for other pumpable fluids. A pumpable fluid is a fluid capable of flowing from the tank into the suction region located at the bottom of the tank under the influence of gravity.

[0021] In some cases, these liquids or fluids contain abrasive solids.

[0022] In some cases, fluids have high viscosity, reaching a level that can be described as a paste; at 20°C, the viscosity may be (on the one hand) 10. 3 mPas or 10 4 mPas and (on the other hand) 10 6 mPas or even 10 7 Between mPas.

[0023] The tank pump is preferably designed as an eccentric screw pump with an impregnation tube that preferably extends downwards to the deepest extraction point of the tank, wherein the deepest extraction point is preferably the bottom of the tank. The stator of the eccentric screw pump extends deep into the impregnation tube, largely reaching even the free end of the tube. The motor of the tank pump is preferably mounted vertically, so that the axis of the motor shaft extends substantially parallel to the axis of the impregnation tube. Thus, the "tank pump" comprises an eccentric screw pump and an impregnation tube, wherein the eccentric screw pump itself includes a stator, a rotor, and a drive motor. Here, the impregnation tube itself can be designed as multi-piece, wherein clamping from multiple screws can be provided in the lower region of the impregnation tube. With its assistance, axial prestress can be applied to the stator bushing via at least one end support ring, for example, to compensate for wear.

[0024] As already mentioned, the end sleeve is secured at the deepest extraction point of the tank, and the impregnation tube, or its free end, is at least partially pushed into the end sleeve. In the region of the free end of the impregnation tube, at least one or preferably multiple clamping bodies are provided. "In the region of the free end of the impregnation tube" means that these clamping bodies are either attached to the free end of the impregnation tube itself or preferably to a support ring, such as the type of support ring already mentioned at the beginning, which is itself connected to the free end of the impregnation tube. It is significant here that the support ring serves both as a retainer for at least one clamping body and as a retainer for at least one support post.

[0025] The tank system according to the invention is characterized in that at least one clamping body is designed to have at least one wedge-shaped portion in its relaxed position, which extends into a radial gap between the end sleeve and the free end of the impregnation tube during the process of pushing the free end of the impregnation tube into the end sleeve, and at least one clamping body is designed to rotate during the process of the free end of the impregnation tube being fully pushed into the end sleeve, thereby clamping the free end of the impregnation tube in the end sleeve.

[0026] Therefore, at least one clamping body is attached to a region at the free end of the impregnating tube, in which it can be pushed into the end sleeve together with the free end of the impregnating tube. In this case, before being pushed in or in the unloaded state, it has at least one wedge-shaped portion that, on the one hand, facilitates pushing in, and on the other hand, generates a first tension related to centering or pre-centering. This occurs because the wedge-shaped portion enters the radial gap between the impregnating tube and the end sleeve during pushing in. In addition, the clamping body is designed to rotate during full pushing in, thereby achieving the desired clamping effect between the impregnating tube or the support ring on the impregnating tube and the end sleeve.

[0027] In this way, the tank pump and / or impregnated tubing can be easily and well aligned, correspondingly compensating for the annular gap between the impregnated tubing and the end sleeve and simplifying assembly, because on the one hand, the required assembly force is significantly reduced compared to the PTFE gaskets discussed at the beginning, and on the other hand, the clamping body can bridge a significantly larger annular gap compared to the circular seals discussed at the beginning. However, most importantly, at least one wedge-shaped portion facilitates "penetration" into the end sleeve, and the rotational movement of the clamping body results in the expected large clamping force. Therefore, the bearing can be designed to be neither too soft nor too hard, and low-tolerance, non-fixed centering is possible. This type of bearing can also compensate for any angular misalignment due to offset mounting. Dynamic forces and stresses (especially on the tank pump) and vibrations are reduced or even eliminated during operation, and / or, a significantly lighter and therefore cheaper tank pump can be used.

[0028] Also advantageous is that the centering and / or fastening of the impregnated tube according to the invention can be loosened and restored in many cases without the need for new parts, such as PTFE gaskets or new rope seals as spares. This greatly simplifies the periodic disassembly and reassembly of the eccentric screw pump in order to significantly readjust the aforementioned somewhat worn stator liner.

[0029] Disassembly of this type of connection is also easier and does not increase the installation space requirements, because shaft misalignment is compensated by the compensation system.

[0030] Preferred variant

[0031] This invention can be designed in a variety of ways to further improve its effectiveness or usability.

[0032] In a preferred embodiment of the invention, the clamping body is elastic, enabling it to compensate substantially by its own (preferably elastic) deformation for tolerances or contamination-related dimensional deviations in the radial clearance between the free end of the impregnating tube and the end sleeve. This provides an additional compensation option, making it easier to insert the impregnating tube into the end sleeve on the one hand, and ensuring the intended connection between the impregnating tube and the end sleeve in the event of installation misalignment on the other.

[0033] Furthermore, it is particularly preferred that at least one clamping body is designed at least substantially as a corner prism, preferably as a tetrahedral corner prism with a trapezoidal cross-section. This "trapezoidal cross-section" can be understood as similar to a trapezoidal cross-section. In this case, the clamping body preferably has an extension perpendicular to the plane of the trapezoidal cross-section, that is, a thickness greater than 1 mm, more preferably greater than 5 mm. Furthermore, the clamping body or corner prism is preferably designed such that it has a trapezoidal long base side and a trapezoidal short base side substantially parallel to the long base side, wherein the connecting surfaces from the trapezoidal long base side toward the trapezoidal short base side form converging trapezoidal waist sides. Thus, the trapezoidal long base side is the face on the longer parallel side of the trapezoidal cross-section, while the trapezoidal short base side is the face on the shorter parallel side of the trapezoidal cross-section. The trapezoidal waist side—preferably the trapezoidal waist side facing the end sleeve during insertion—forms an insertion wedge with the trapezoidal long base side. This makes it easier to insert the clamping body into the radial gap, even when it would be more difficult to insert the immersion tube into the tank from the top and thus “penetrate” it. Furthermore, this shape facilitates elastic deformation of the clamping body through bending, which is more effective than simple pressure deformation or compression.

[0034] Another preferred embodiment is that the clamping body in the clamping state abuts against the free end of the impregnation tube and / or against the support ring at the free end of the impregnation tube with its trapezoidal short base side, and at least partially abuts against the inner surface of the end sleeve with its trapezoidal long base side. In this way, the trapezoidal waist side, which protrudes laterally beyond the trapezoidal short base side, can be bent and flipped inward, thereby making the clamping body more elastic and compliant.

[0035] Furthermore, it is particularly preferred that the clamping body has a through-hole by which it can be pivotally held at the end of the impregnation tube by a pin or threaded pin (preferably in the form of a screw), preferably at a support ring attached to the end of the impregnation tube. The degree of downward tilt of the clamping body in the unclamped state can be set by means of the threaded pin (preferably bonded with Loctite or a similar material after adjustment). The shape of the through-hole is crucial here, as it creates a stop point for the pin. Ideally, the shape of the through-hole is at least partially a mixture of mutually transitioning cylindrical and conical shapes.

[0036] Furthermore, it is particularly preferred that the triangular base of the clamping body has a recess in its central region or in the region surrounding the through hole, the recess preferably being in the shape of a truncated cylinder. This allows for better gripping of the end sleeve, resulting in more ideal positioning. Consequently, the clamping body is rotated after being inserted into the radial gap between the free end of the impregnated tube and the end sleeve.

[0037] Furthermore, it is particularly preferred that if the clamping body is held in the groove of the support ring, which clamps the free end of the immersion tube in the axial direction, preferably with some lateral clearance, the clamping body can not only swing up and down relative to the final installation position, but also align to some extent clockwise and counterclockwise. In this way, further manufacturing tolerances and / or general inaccuracies can be compensated for.

[0038] Another preferred embodiment involves providing at least three clamping bodies, which are preferably arranged substantially evenly along the circumference of the impregnating tube or its support ring. This allows the annular gap to bridge evenly around its circumference and avoids unilateral impact of the free end of the impregnating tube on the end sleeve. Attached Figure Description

[0039] Figure 1 shows a tank unit with segmented tanks and tank pumps in a side view, with its immersion tube inserted into the end sleeve (prior art).

[0040] Figure 2 shows the free end of the impregnation tube, which has been pushed into the end sleeve, wherein the free end carries a circular sealing ring retainer (prior art).

[0041] Figure 3 A three-dimensional sectional view shows the free end and end sleeve of the impregnation tube of a tank pump with a clamping body, wherein the clamping body is in the clamping position.

[0042] Figure 4 The free end of the tank pump's impregnation tube is shown in a three-dimensional view, with a clamp in a relaxed position, not pushed into the end connection.

[0043] Figure 5 The front cross-sectional view shows the free end and end sleeve of the immersion tube of the tank pump with a clamping body, wherein the clamping body is in a pivot position.

[0044] Figure 6 The free end and end sleeve of the impregnation tube of the tank pump with clamping body are shown in a cross-sectional front view, wherein the clamping body is in the clamping position.

[0045] Preferred embodiments

[0046] First, it should be emphasized that Figure 1 (and Figure 2) only illustrate the prior art or technical background of the present invention, but such illustrations in Figure 1 are also important for the preferred embodiments of the present invention. The tank unit 1 shown in Figure 1 also represents an exemplary preferred embodiment of the tank unit according to the present invention, wherein, compared with the prior art, the changes are mainly in the region of the free end 15 of the impregnation tube 5 or in the region of the end sleeve 6.

[0047] However, as shown in Figure 1, the preferred embodiment of the present invention includes a tank pump 3 as an eccentric screw pump, the eccentric screw pump having a stator 4, wherein the motor 102 of the tank pump 3 is located outside the tank 2 (see Figure 1). Reference is again made here to the explanations in the corresponding "Prior Art" and "Background Art" sections. For the sake of simplicity and better understanding, in Figures 3 to 6 The upper part of the tank pump 3, the upper part of the immersion pipe 5, and the tank 2, as well as the entire tank unit according to the invention, are not shown in the figure because the design here is intended to be similar to the design shown in Figure 1.

[0048] first, Figure 3 The free end 15 of the immersion tube 5 of the tank pump 3 involved is shown. The tank pump 3 is shown here as an eccentric screw pump with a stator 4. The stator 4 preferably extends at least to the free end 15 of the immersion tube 5. The stator 4 has a stator housing 21 that substantially completely surrounds the stator. The stator housing 21 is preferably completely and at least partially surrounded by the immersion tube 5, as shown in the diagram. Figure 3 , Figure 5 and Figure 6 As shown.

[0049] The support ring 17 is attached to the free end 15 of the impregnation tube 5 and accommodates the additional support post 20 (see...). Figure 4 Additionally, the support ring 17 has multiple grooves in which clamping bodies 7 are attached. These clamping bodies 7 are preferably designed in the form of prisms 10, wherein the cross-section of the prisms 10 forms a trapezoidal cross-section 11.

[0050] The prism 10, or the clamping body 7 designed in this manner, has a trapezoidal long base side 12 and a trapezoidal short base side 13 arranged substantially parallel thereto. These two sides are connected to each other by trapezoidal waist side 14. Therefore, this type of clamping body 7 is preferably fitted into the grooves of the support ring 17 by means of screws 16, such that preferably at least three clamping bodies 7 are evenly distributed on the circumference of the support ring 17, as... Figure 4 As shown. Here, the shape of a truncated cylinder can also be seen on the long base side 12 of the trapezoid (zylinder- The clamping body 7 preferably has the recess 19.

[0051] During assembly, the free end 15 of the impregnation tube 5 must be pushed into the end sleeve 6, as described several times. In the first step of pushing, the wedge-shaped portion 8 of the clamping body 7 facilitates "penetration" into the end sleeve 6. Due to the specially shaped through-hole 18 in the clamping body, the clamping body 7 can rotate or deflect, as... Figure 5 As shown.

[0052] Then the free end 15 of the impregnation tube 5 is further pushed into the end sleeve 6, causing the clamping body to deflect again, so that its trapezoidal short bottom side 13 abuts against the support ring 17 and its trapezoidal long bottom side 12 abuts against the end sleeve 6, and the clamping body 7 itself is also subjected to tension and elastic deformation. Thus, the radial gap 9 between the impregnation tube 5 or its support ring 17 and the end sleeve 6 is compensated, and the impregnation tube 5 is clamped in the end sleeve 6. This state is... Figure 3 and Figure 6 As shown in the image.

[0053] The through hole 18 is preferably designed such that it is non-rotationally symmetric with respect to the central axis of the clamping body 7. Therefore, the through hole 18 is at least partially designed as a cylindrical cut in its lower half and at least partially designed as a conical cut in its upper half. The head of the screw 16 is preferably located partially at the cylindrical cut in the clamping position of the clamping body 7 (see...). Figure 6 ), and in the pivot position of clamping body 7, it is at least partially located at the conical cut (see Figure 5 ).

[0054] List of reference numerals

[0055] 1 tank unit

[0056] 2 cans

[0057] 3-tank pump

[0058] 4. Stator of eccentric screw pump

[0059] 5 Impregnation tubes

[0060] 6. End sleeve

[0061] 7 Clamping body

[0062] 8. Wedge-shaped section

[0063] 9 Radial clearance

[0064] 10 corner prism

[0065] 11 types of trapezoidal cross sections

[0066] 12 Trapezoidal long base side surface

[0067] 13 Trapezoidal short base side

[0068] 14 Trapezoidal waist side

[0069] 15. Free end of the impregnation tube

[0070] 16 screws

[0071] 17. Support ring at the free end of the impregnation tube

[0072] 18. Through hole of clamping body

[0073] 19. The concave part of a cylindrical section

[0074] 20 support rods

[0075] 21 Stator Housing

[0076] 101 Circular Seal Retainer

[0077] 102 pump motor

[0078] 103 Circular Sealing Ring

Claims

1. A tank unit (1) comprising at least one tank (2) and a tank pump (3) immersed in or submerged in the tank (2), the tank pump (3) being in the form of an eccentric screw pump (4) having an immersion tube (5) extending downward to the deepest extraction point of the tank (2), wherein, The end sleeve (6) is fastened to the deepest extraction point of the tank (2), and the impregnation tube (5) is at least partially pushed into the end sleeve (6), wherein at least one clamping body (7) is provided in the region of the free end (15) of the impregnation tube (5), characterized in that at least one clamping body (7) is designed such that it has at least one wedge portion (8) in its relaxed position, wherein at least one wedge portion (8) extends into the radial gap (9) between the end sleeve (6) and the free end (15) of the impregnation tube (5) during the process of pushing the free end (15) of the impregnation tube (5) into the end sleeve (6), and at least one clamping body (7) is designed to rotate during the process of fully pushing the free end (15) of the impregnation tube (5) into the end sleeve (6), thereby clamping the free end (15) of the impregnation tube (5) in the end sleeve (6).

2. The tank unit (1) according to claim 1, characterized in that, At least one clamping body (7) is provided on the support ring (17) at the free end (15) of the impregnation tube (5).

3. The tank unit (1) according to claim 1, characterized in that, The clamping body (7) is elastic, which allows it to compensate for tolerances or contamination-related dimensional deviations in the radial clearance (9) between the free end (15) of the impregnation tube (5) and the end sleeve (6) due to their own deformation.

4. The tank unit (1) according to claim 2, characterized in that, The clamping body (7) is elastic, which allows it to compensate for tolerances or contamination-related dimensional deviations in the radial clearance (9) between the free end (15) of the impregnation tube (5) and the end sleeve (6) due to their own deformation.

5. The tank unit (1) according to any one of claims 1 to 4, characterized in that, At least one of the clamping bodies (7) is designed as a corner prism (10) having a trapezoidal cross section (11), at least one of the clamping bodies (7) having an extension of more than 1 mm perpendicular to the plane of the trapezoidal cross section (11), at least one of the clamping bodies (7) having a trapezoidal long bottom side (12), a trapezoidal short bottom side (13) and two trapezoidal waist side (14) converging from the trapezoidal long bottom side (12) toward the trapezoidal short bottom side (13).

6. The tank unit (1) according to claim 2 or 4, characterized in that, In the clamping state, the clamping body (7) abuts against the free end (15) of the impregnation tube (5) and / or the support ring (17) at the free end (15) of the impregnation tube (5) with its trapezoidal short bottom side (13), and the clamping body (7) abuts against the inner surface of the end sleeve (6) with its trapezoidal long bottom side (12).

7. The tank unit (1) according to any one of claims 1 to 4, characterized in that, The clamping body (7) has a through hole (18) by means of the through hole (18), and the clamping body (7) can be pivotally held by a pin on a support ring (17) at the free end (15) of the impregnation tube (5), the support ring (17) being attached to the free end (15) of the impregnation tube (5).

8. The tank unit (1) according to claim 5, characterized in that, The clamping body (7) has a through hole (18) by means of the through hole (18), and the clamping body (7) can be pivotally held by a pin on a support ring (17) at the free end (15) of the impregnation tube (5), the support ring (17) being attached to the free end (15) of the impregnation tube (5).

9. The tank unit (1) according to claim 8, characterized in that, The trapezoidal long bottom side (12) of the clamping body (7) has a recess (19) in its central region or in the region surrounding the through hole (18).

10. The tank unit (1) according to claim 9, characterized in that, The recess (19) is shaped like a truncated cylinder.

11. The tank unit (1) according to any one of claims 1 to 4, characterized in that, The clamping body (7) is designed and its dimensions are determined such that a crank effect is generated on the clamping body (7), so that when a certain pivot angle is exceeded, the clamping body (7) moves from its pivot position to its fully clamped position.

12. The tank unit (1) according to claim 2 or 4, characterized in that, The clamping body (7) is held in the groove of the support ring (17), which clamps the free end (15) of the impregnation tube (5) in the axial direction and has some lateral gaps, so that the clamping body (7) can not only swing up and down, but also align to a certain extent in the clockwise and counterclockwise directions.

13. The tank unit (1) according to claim 2 or 4, characterized in that, The clamping body (7) is deflected by tilting on its trapezoidal short bottom side (13) at the edge of the free end (15) of the impregnation tube (5) or at the edge of the support ring (17) attached to the free end (15) of the impregnation tube (5).

14. The tank unit (1) according to any one of claims 1 to 4, characterized in that, There are at least three clamping bodies (7).

15. A tank pump (3) in the form of an eccentric screw pump (4) with an impregnation tube (5) leading to the deepest extraction point of a tank (2), an end sleeve (6) secured to the deepest extraction point, the impregnation tube (5) being at least partially pushed into the end sleeve (6), wherein, At least one clamping body (7) is provided in the region of the free end (15) of the impregnation tube (5), characterized in that at least one clamping body (7) is designed such that, in its relaxed position, the clamping body (7) has a wedge-shaped portion (8) which is capable of extending into the radial gap (9) between the end sleeve (6) and the free end (15) of the impregnation tube (5) during the process of pushing the free end (15) of the impregnation tube (5) into the end sleeve (6), and at least one clamping body (7) is designed to rotate during the process of fully pushing the free end (15) of the impregnation tube (5) into the predetermined end sleeve (6), thereby clamping the free end (15) of the impregnation tube (5) in the end sleeve (6).

16. The tank pump (3) according to claim 15, characterized in that, At least one clamping body (7) is provided on the support ring (17) at the free end (15) of the impregnation tube (5).

17. A method for securing the free end (15) of the immersion tube (5) of a tank pump (3) in an end sleeve (6) of a tank (2), said end sleeve (6) being generally not directly accessible during assembly, characterized in that, Using a plurality of movable clamping bodies (7), each clamping body (7) having at least one wedge-shaped portion (8) in its relaxed position, the clamping body (7) first extends into the radial gap (9) between the free end (15) of the impregnation tube (5) and the end sleeve (6) by means of its wedge-shaped portion (8) during the process of pushing the free end (15) of the impregnation tube (5) into the end sleeve (6), thereby aligning or pre-aligning the impregnation tube (5) and the end sleeve (6) relative to each other, and then being pivoted by further pushing the free end (15) of the impregnation tube (5) into the end sleeve (6), thereby ultimately clamping the free end (15) of the impregnation tube (5) and the end sleeve (6) together.

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