Connecting pipe, electrolysis system and connecting method

Abstract

The present disclosure relates to a connection pipe 50 for connecting an electrolytic cell nozzle 22 in fluid communication with a chamber 11, 12 of an electrolytic cell 10 to an outlet header 23. The connecting pipe comprises a pipe body 51, an outer sleeve 52 connected to one end of the pipe body 51, an inner sleeve 53 arranged inside the outer sleeve 52 so that an annular gap G for accommodating the electrolytic cell nozzle 22 is defined between the outer sleeve 52 and the inner sleeve 53, and a sealing piece S existing between the end of the pipe body 51 and the annular gap G, and the sealing element S is arranged between the end part of the pipe body (51) and the annular gap (G), and is formed by inseparable combination between the outer sleeve 52 and the inner sleeve 53.

Description

Technical Field

[0001] The present invention relates to a connecting pipe for connecting an electrolytic cell nozzle in fluid communication with an electrolytic cell chamber to an outlet header. The present invention also relates to an electrolysis system for liquid electrolysis treatment. In addition, the present invention also relates to a method for connecting an electrolytic cell nozzle in fluid communication with an electrolytic cell chamber to an outlet header. Background Art

[0002] DE 10 2017 217 361 A1 discloses an electrolysis apparatus for electrolytic treatment of a liquid, such as chlor-alkali electrolysis or alkaline water electrolysis. The electrolysis apparatus includes an anode chamber and a cathode chamber, which are separated from each other by an ion exchange membrane. In chlor-alkali electrolysis, a first liquid such as brine is fed into the anode chamber through an external supply pipe and a nozzle through an internal supply pipe, and the treated liquid and the gas generated at the anode then flow out through a discharge pipe to an outlet pipe. Similarly, a second liquid such as diluted caustic soda solution is laterally distributed within the width of the cathode chamber through a solution supply pipe, and the treated liquid and the gas generated at the cathode flow out through a discharge pipe to another outlet header.

[0003] Figure 5 and Figure 6 shows an example of an existing electrolysis apparatus. The electrolysis apparatus may include a plurality of electrolytic cells 10 arranged in parallel with each other. Each electrolytic cell 10 may include a housing, which is composed of two half-housings, namely a cathode half-housing 11 and an anode half-housing 12. The two half-housings may be respectively provided with flange-like edge portions 19 at their peripheries and clamped with a membrane 13 through a seal. The membrane 13 may form a partition wall between the cathode half-housing 11 and the anode half-housing 12. The cathode half-housing 11 contains a cathode chamber or a cathode electrolyte chamber, and the anode half-housing 12 contains an anode chamber or an anode electrolyte chamber. The cathode half-housing 11 and the anode half-housing 12 may be connected to each other through screws 14 in the peripheral region of their flange-like edge portions 19. The screws 14 may be arranged laterally to form a sealed electrolytic cell 10.

[0004] In the lower regions of each of the half-housings 11, 12, there are provided inlet distribution pipes 15, 16 for conveying electrolyte, and an electrolytic cell nozzle 22, 22 through which waste electrolyte can be discharged. Baffles 18 may be provided inside the half-housings 11, 12 to guide the flow of electrolyte during the operation of the electrolytic cell 10. The waste electrolyte from the respective half-housings 11, 12 can be collected into a corresponding outlet header 23 through an outlet hose 24 connected to the respective electrolytic cell nozzle 22.

[0005] Figure 7Shows an example of an existing design of an electrolytic cell discharge system. In this figure, a chlorine gas collection outlet channel 20 and a hydrogen gas collection outlet channel 21 provided at the top of the electrolytic cell 10 can be seen. The chlorine gas collection outlet channel 20 is used to collect discharged brine and chlorine gas, and the hydrogen gas collection outlet channel 21 is used to collect concentrated caustic soda and hydrogen gas. The electrolytic cell nozzle 22 is connected to the outlet channel 20 through a discharge pipe 17. The discharge pipe 17 is inserted into the electrolytic cell nozzle 22 from below and extends upward into the outlet channel 20 within the anode chamber. The discharge pipe 17 is disposed inside the electrolytic cell 10 and is used to discharge liquid and product gas from the outlet channel 20 through the electrolytic cell nozzle 22 to the outlet header 23.

[0006] The discharge pipe 17 and the electrolytic cell nozzle 22 are then connected to the outlet hose 24 through a flange connection 25. This flange connection 25 is for the electrolytic cell side and the header side. Figure 8 Shows an example of the discharge pipe 17. It can be seen that the discharge pipe 17 with a flange 17a is inserted into the electrolytic cell nozzle 22. Figure 9 Shows an example of the outlet hose 24 with flanges 24a, 24b at both ends. In the design of the prior art, the outlet hose 24 and the discharge pipe 17 are installed as separate components and connected together through a flange connection 25.

[0007] This flange connection 25 forms a reliable connection between the electrolytic cell nozzle 22, the discharge pipe 17, and the outlet hose 24, but at the same time results in high production costs and high assembly costs. Multiple sets of bolts and nuts must be used to apply uniform force along the periphery between the flanges 17a and 24a for fastening, and uniform force must be applied, otherwise sufficient sealing performance may not be achieved. This requires experience and time. In addition, due to the close arrangement of adjacent hoses, the accessibility of the bolts and nuts is poor, further increasing the assembly time.

[0008] The object of the present invention is to overcome the disadvantages of the prior art, and in particular to provide a device and method for connecting an electrolytic cell nozzle to an outlet header, which is easier to assemble while maintaining sealing performance. Summary of the Invention

[0009] This object is achieved by the subject matter described in independent claims 1, 13, and 15.

[0010] According to one aspect of the present invention, a connecting pipe is provided for connecting an electrolytic cell nozzle in fluid communication with an electrolytic cell chamber to an outlet header. The connecting pipe includes: a pipe body; an outer sleeve connected to an end of the pipe body; an inner sleeve disposed inside the outer sleeve for defining an annular gap for accommodating the electrolytic cell nozzle between the inner sleeve and the outer sleeve; and a seal existing between the outer sleeve and the inner sleeve and located between the end of the pipe body and the annular gap. The seal is formed by an inseparable bond between the outer sleeve and the inner sleeve.

[0011] The connecting pipe can be regarded as a combined (discharge) pipe - hose structure. Through this structure, the above-mentioned flange connection is omitted. The present invention provides a single end component that combines the functions of a discharge pipe and an outlet hose. By providing a seal located between the outer sleeve and the inner sleeve and on the pipe body side of the annular gap, good sealing performance can be ensured. The outer sleeve can be pushed onto the electrolytic cell nozzle, so that the electrolytic cell nozzle is inserted into the annular gap between the outer sleeve and the inner sleeve. The end of the annular gap provides a stop surface for the electrolytic cell nozzle and at the same time ensures the correct positioning of the end of the inner sleeve within the electrolytic cell.

[0012] A clamping device can be used to ensure the mechanical connection state between the connecting pipe and the electrolytic cell nozzle. However, since the sealing performance is mainly ensured by the seal between the inner and outer sleeves, the required clamping force can be reduced compared to the existing flange connection. In particular, only one screw may be sufficient to provide the required clamping force, thus not causing excessive assembly costs. The inseparable bond between the outer sleeve and the inner sleeve is preferably an inter-material bond between the materials of the outer sleeve and the inner sleeve.

[0013] Preferably, the outer sleeve is made of a flexible plastic material. The plastic outer sleeve can be deformed to fit the electrolytic cell nozzle, and even without installing an additional clamping device, a sealing force can be generated on the outer surface of the electrolytic cell nozzle. In this way, a good connection state between the connecting pipe and the electrolytic cell nozzle can also be achieved.

[0014] Particularly preferably, the outer sleeve is made of polytetrafluoroethylene (PTFE). This material can withstand the harsh chemical conditions in chlor-alkali electrolysis and water electrolysis and exhibits good plastic welding properties, enabling the outer sleeve to be welded to the inner sleeve by thermal connection.

[0015] Preferably, the seal is formed by connecting parts of the outer sleeve and the inner sleeve by plastic welding. This type of connection can provide a reliable seal between the outer sleeve and the inner sleeve at a relatively low cost. As an alternative or supplement, it is also conceivable to connect the outer sleeve and the inner sleeve by, for example, bonding.

[0016] Preferably, the diameter of the first part of the outer sleeve that defines the annular gap is larger than the diameter of the second part of the outer sleeve fixed to the inner sleeve. This design can define the annular gap while keeping the diameter of the inner sleeve constant, thereby further reducing the cost of the connecting pipe.

[0017] Preferably, the outer sleeve has a tapered transition section between the first part and the second part. This helps to simplify the process of installing the outer sleeve onto the electrolytic cell nozzle and relieves the pressure in the transition area when a clamping force is applied to the outer sleeve using a clamping device.

[0018] Preferably, the inner sleeve protrudes from the outer sleeve in a direction away from the pipe body. This allows the inner sleeve to be inserted into the electrolytic cell to a sufficient depth.

[0019] Preferably, the inner sleeve is made of a plastic material, in particular polytetrafluoroethylene (PTFE). This helps to achieve a particularly good thermoplastic welding connection between the inner sleeve and the outer sleeve. Particularly preferably, the inner sleeve and the outer sleeve are made of the same plastic material. However, it is also conceivable that the inner sleeve is made of, for example, metal or fiber-reinforced plastic.

[0020] Preferably, the pipe body is a flexible pipe. This helps to improve the flexibility of the connecting pipe arrangement. The pipe body can also be a corrugated hose.

[0021] Preferably, the outer sleeve and the pipe body form a one-piece structure. Such a single-piece component can be manufactured at a relatively low cost and does not cause any fluid leakage problems.

[0022] The present invention also relates to an electrolysis system for liquid electrolysis treatment. The system includes an electrolysis device having an anode chamber, a cathode chamber, and an ion exchange membrane separating the anode chamber and the cathode chamber, and electrolytic cell nozzles are respectively assigned to the corresponding chambers. The system also includes one or more manifolds. The system also includes a connecting pipe as described above. Two or more connecting pipes can be provided for the corresponding electrolytic cell nozzles. The connecting pipe connects one of the electrolytic cell nozzles to one of the manifolds, and the electrolytic cell nozzle is inserted into an annular gap defined by the outer sleeve and the inner sleeve of the connecting pipe. A clamping force is applied to the outer sleeve by a clamping device to clamp the outer sleeve to the electrolytic cell nozzle.

[0023] Preferably, the clamping device includes a screw clamp, which includes a strap and a screw configured to tighten the strap. Such clamps are widely available on the market and are inexpensive. Other types of clamps, such as spring clamps and wire clamps, are also applicable.

[0024] The present invention also relates to a method of connecting an electrolytic cell nozzle communicating with a chamber of an electrolysis device to a manifold. The method includes: providing a connecting pipe as described above; inserting the electrolytic cell nozzle into an annular gap defined by the outer sleeve and the inner sleeve of the connecting pipe; and applying a clamping force to the outer sleeve using a clamping device.

[0025] A number of additional inventive aspects will be set forth in the following description. The inventive aspects can relate to individual features or combinations of features. It should be understood that the following detailed description is only exemplary and explanatory and does not limit the broad inventive concept within the scope of the appended claims. Description of the Drawings

[0026] Figure 1is a perspective view of a connecting pipe according to a first embodiment of the present invention, which is to be installed on an electrolytic cell nozzle of an electrolytic cell;

[0027] Figure 2 is Figure 1 a partially enlarged cross-sectional view of the state where the connecting pipe shown is installed on the electrolytic cell nozzle;

[0028] Figure 3 is the same as Figure 1 a perspective view of an electrolytic cell chamber connected to the connecting pipe shown;

[0029] Figure 4 is a perspective view of an electrolytic cell chamber connected to a connecting pipe according to a second embodiment of the present invention;

[0030] Figure 5 is a perspective view of a cross-sectional view of an electrolytic cell;

[0031] Figure 6 is Figure 5 a front view of the electrolytic cell shown;

[0032] Figure 7 is a cross-sectional view of an electrolytic cell with an emission system in the prior art;

[0033] Figure 8 is a perspective view of an emission pipe in the prior art;

[0034] Figure 9 is a perspective view of an outlet hose in the prior art. Detailed Description of the Invention

[0035] Figure 1 Shows a connecting pipe according to an embodiment of the present invention, which is used to assemble with an electrolytic cell nozzle of an electrolytic cell. The inventive concept can be applied to any type of electrolytic cell and systems for handling liquid electrolytes and product gases. An example of an electrolytic cell is as Figures 5 to 7 shown. However, it should be noted that in the present invention, the connecting pipe 50 as shown in Figure 1 will be used to replace the outlet hose 24 and the emission pipe 17. Descriptions of other structures in the above electrolytic cell and system are incorporated into the description of the present invention to avoid repetition.

[0036] The connecting pipe 50 is designed to connect an electrolytic cell nozzle 22 that is in fluid communication with the chambers 11, 12 of the electrolytic cell 10 to an outlet header 23 (see Figure 6 and Figure 7 ), and this header serves as a collection and discharge pipeline. The connecting pipe 50 includes a pipe body 51, an outer sleeve 52, and an inner sleeve 53. An annular gap G is defined between the outer sleeve 52 and the inner sleeve 53.

[0037] The tube body 51 is a component that mainly extends between the header and the outer sleeve 52. The length of the tube body 51 can be greater than the distance between the electrolytic cell and the header (e.g., between the electrolytic cell 10 and the header 23). The tube body 51 can be a flexible hose to increase the layout freedom of the connecting tube 50. For example, the tube body 51 can mainly consist of a corrugated tube or a bellows hose. The tube body 51 should be chemically resistant to the fluids and gases processed in the electrolytic cell. Most preferably, the tube body 51 is made of polytetrafluoroethylene (PTFE). The tube body 51 can include a fiber-reinforced material or a similar material. The tube body 51 can also be made of other synthetic plastic materials, such as polyethylene, polyvinyl chloride, or polypropylene.

[0038] The outer sleeve 52 is connected to one end of the tube body 51. The outer sleeve 52 can be made of a flexible plastic material, such as a thermoplastic resin, like polyethylene, polyvinyl chloride, polypropylene. Most preferably, the outer sleeve 52 is made of polytetrafluoroethylene (PTFE). The plastic outer sleeve can be deformed to fit the electrolytic cell nozzle 22 and ensure that the clamping force from the clamping device 54 is transmitted to the electrolytic cell nozzle 22 arranged in the annular gap G. Thus, a good connection state between the connecting tube and the electrolytic cell nozzle can be achieved.

[0039] The outer sleeve 52 can be tubular. The outer sleeve 52 can have a circular cross-section. The outer sleeve 52 can also have an elliptical cross-section. Preferably, the cross-section of the outer sleeve 52 is similar to that of the inner sleeve 53, so that the width of the annular gap G remains constant in its circumferential direction.

[0040] An inner sleeve 53 is arranged inside the outer sleeve 52 to define an annular gap G for accommodating the electrolytic cell nozzle 22. When viewed in the longitudinal direction of the connecting tube 50, a seal S is formed above the tube body 51 and below the annular gap G where the outer sleeve 52 and the inner sleeve 53 are located. The seal S is formed by an inseparable combination between the outer sleeve 52 and the inner sleeve 53. The seal S can be formed by plastic welding connection between parts 55, 57 of the outer sleeve and the inner sleeves 52, 53. The welding parts 55, 57 can be joined together by thermal bonding. For example, after inserting the inner sleeve 53 into the cavity of the outer sleeve 52, heat can be applied at the position where the seal S is to be formed, so that the outer sleeve and the inner sleeve are joined between their parts 55, 57. Additionally or alternatively, it is also conceivable to use one or more adhesives to connect the outer sleeve 52 and the inner sleeve 53 to each other.

[0041] As Figure 2As shown, the outer sleeve 52 may have a first portion P1 and a second portion P2 with a smaller diameter than the first portion P1. The outer sleeve 52 may also have a third portion P3 with a smaller diameter than the second portion P2. At the first portion P1, the outer sleeve 52 and the inner sleeve 53 together define an annular gap G. The width of the annular gap G may be equal to or slightly less than the wall thickness of the electrolytic cell nozzle 22, so that a sealing function can be expected to be formed between the sleeves 52, 53 and the electrolytic cell nozzle 22 even without applying a clamping force from the clamping device 54. At the second portion P2, the above-mentioned seal S is formed. A tapered transition section 56 may be provided between the first portion P1 and the second portion P2. When the clamping device 54 applies a clamping force to the outer sleeve, this structure can relieve the pressure in the transition region. The inner diameter of the third portion P3 may be the same as the inner diameter of the pipe body 51 and the inner diameter of the inner sleeve 53. This can reduce the flow resistance at the end of the connecting pipe 51.

[0042] Preferably, the outer sleeve 52 and the pipe body 51 form an integral structure. Such a single component can be manufactured at a lower cost and does not cause any fluid leakage problems.

[0043] The inner sleeve 53 may protrude from the end of the outer sleeve 52 in a direction away from the pipe body 51. This allows the inner sleeve 53 to be inserted into the electrolytic cell nozzle 22 to a sufficient depth.

[0044] The inner sleeve 53 may be tubular. The inner sleeve 53 may have a circular cross-section. The inner sleeve 53 may also have an oval cross-section. Preferably, the cross-sectional shape of the inner sleeve 53 may be similar to the cross-sectional shape of the electrolytic cell nozzle 22.

[0045] The inner sleeve 53 may be made of a plastic material. Particularly preferably, the inner sleeve 53 may be made of polytetrafluoroethylene (PTFE). The inner sleeve 53 may be more rigid than the outer sleeve 52. If the inner sleeve 53 and the outer sleeve 52 are made of the same material, this may be, for example, due to the smaller diameter and / or larger wall thickness of the inner sleeve 53. This can prevent the inner sleeve 53 from being overly deformed when the clamping device 54 applies a clamping force to the outer sleeve 52, so that an appropriate clamping force is applied to the electrolytic cell nozzle 22 in the annular gap G. Generally, the inner sleeve 53 may also be made of metal. The inner sleeve 53 may also be made of fiber-reinforced plastic.

[0046] The clamping device 54 is provided around the outer sleeve 52 to apply a clamping force thereto. The clamping device 54 may be configured to apply a circumferential clamping force to the outer sleeve 52. The clamping device 54 may be a screw clamp 54, which includes a hoop 54a that extends around the outer sleeve 52 and a screw 54b for tightening the hoop 54a.

[0047] See Figure 3, it can be seen that the connecting pipe 50 of the present invention is connected to the electrolytic cell nozzle 22 of the electrolytic cell 10. For the sake of simplicity, the clamping device 54 is not shown. The connecting pipe 50 is used to connect to the other end or the second end of the outlet header and still has a flange 58.

[0048] Figure 4 An electrolytic cell 10 is shown, which is connected to the connecting pipe 50 according to the second embodiment of the present invention. Different from Figure 1 and Figure 3 the first embodiment shown, the connecting pipe 50 does not have a flange 58 at the end connected to the outlet header 23. Instead, the second end of this connecting pipe (connected to the header 23) has a structure similar to that of Figure 2 the first end shown (connected to the electrolytic cell 10). In this case, the header nozzle installed around the header opening will be inserted into the second annular gap G' between the second outer sleeve 52' and the second inner sleeve 53', and then a second clamping device is applied around the second outer sleeve 52'. The second inner sleeve 53' preferably extends a certain distance into the header to prevent liquid electrolyte from existing on the joint surface between the second outer sleeve 52 and the header nozzle. In addition, it is expected that cost reduction can be achieved during assembly and maintenance.

[0049] The present invention also relates to an electrolysis system, which includes the electrolysis device, the header and the connecting pipe as described above. The electrolysis device can be a chlor-alkali electrolysis device, an alkaline water electrolysis device or a similar device.

[0050] In addition, the present invention also relates to a method for connecting an electrolytic cell nozzle communicating with the chamber of an electrolysis device to a header. The electrolysis device can be a chlor-alkali electrolysis device, an alkaline water electrolysis device or a similar device. The method includes: providing the connecting pipe 50 as described above, inserting the electrolytic cell nozzle 22 into the annular gap G defined by the outer sleeve and the inner sleeve 52, 53 of the connecting pipe 50, and applying a clamping force to the outer sleeve 52 using the clamping device 54.

[0051] List of reference numerals

[0052] 10 Electrolytic cell

[0053] 11 Half shell or chamber

[0054] 12 Half shell or chamber

[0055] 13 Membrane

[0056] 14 Screw

[0057] 15 Inlet distribution pipe

[0058] 16 Inlet distribution pipe

[0059] 17 Discharge pipe

[0060] 17a flange

[0061] 18 baffle

[0062] 19 edge part

[0063] 20, 21 outlet channel

[0064] 22 electrolytic cell nozzle

[0065] 23 outlet header

[0066] 24 outlet hose

[0067] 24a, 24b flange

[0068] 25 flange connection

[0069] 50 connecting pipe

[0070] 51 pipe body

[0071] 52, 52’ outer sleeve

[0072] 53, 53’ inner sleeve

[0073] 54 clamping device

[0074] 54a hoop band

[0075] 54b screw

[0076] 55, 57 plastic welding part

[0077] 56 tapered transition section

[0078] 58 flange

[0079] G, G’ annular gap

[0080] S seal

[0081] P1, P2, P3 outer sleeve part.

Claims

1. A connecting pipe (50) for connecting an electrolytic cell nozzle (22) in fluid communication with a chamber (11, 12) of an electrolysis device (10) to an outlet header (23), comprising: - a pipe body (51); - an outer sleeve (52) connected to a first end of the pipe body (51); - an inner sleeve (53) disposed inside the outer sleeve (52) so as to define an annular gap (G) for receiving the electrolytic cell nozzle (22) between the inner sleeve (53) and the outer sleeve (52); and - a seal (S) present between the outer sleeve and the inner sleeve (52, 53) and located between an end of the pipe body (51) and the annular gap (G), wherein the seal (S) is formed by an inseparable bond between the outer sleeve (52) and the inner sleeve (53).

2. The connecting pipe (50) according to claim 1, wherein the outer sleeve (52) is made of a flexible plastic material.

3. The connecting pipe (50) according to claim 2, wherein the outer sleeve (52) is made of polytetrafluoroethylene (PTFE).

4. The connecting pipe (50) according to any one of claims 1 to 3, wherein the seal (S) is formed by connecting a part (55, 57) of the outer sleeve and the inner sleeve (52, 53) by plastic welding.

5. The connecting pipe (50) according to any one of claims 1 to 4, wherein a diameter of a first portion (P1) of the outer sleeve (52) defining the annular gap (G) is larger than a diameter of a second portion (P2) of the outer sleeve (52) fixed to the inner sleeve (53).

6. The connecting pipe (50) according to claim 5, wherein the outer sleeve (52) has a tapered transition section (56) between the first and second portions (P1, P2).

7. The connecting pipe (50) according to any one of claims 1 to 6, wherein the inner sleeve (53) protrudes from the outer sleeve (52) in a direction away from the pipe body (51).

8. The connecting pipe (50) according to any one of claims 1 to 7, wherein the inner sleeve (53) is made of a plastic material.

9. The connecting pipe (50) according to claim 8, wherein the inner sleeve (53) is made of polytetrafluoroethylene (PTFE).

10. The connecting pipe (50) according to any one of claims 1 to 9, wherein the pipe body (51) is a flexible pipe.

11. The connecting pipe (50) according to any one of claims 1 to 10, wherein the pipe body (51) is a corrugated hose.

12. The connecting pipe (50) according to any one of claims 1 to 11, wherein the outer sleeve (52) and the pipe body (51) form a one-piece structure.

13. An electrolysis system for liquid electrolytic treatment, comprising: - an electrolytic cell (10) having an anode chamber (12), a cathode chamber (11) and an ion exchange membrane (13) separating the anode chamber (12) from the cathode chamber (11), and electrolytic cell nozzles (22) respectively provided in each chamber (11, 12); - one or more headers (23); - and - and - and The connecting pipe (50) according to any one of claims 1 to 12, for connecting one of the electrolytic cell nozzles (22) to one of the headers (23), wherein the electrolytic cell nozzle (22) is inserted into an annular gap (G) defined between an outer sleeve and an inner sleeve (52, 53) of the connecting pipe (50), and a clamping force is applied to the outer sleeve (52) by a clamping device (54) to clamp the outer sleeve (52) to the electrolytic cell nozzle (22).

14. The electrolysis system according to claim 13, wherein, the clamping device (54) comprises a screw clamp, which comprises a hoop band (54a) extending around the outer sleeve (52), and a screw (54b) for tightening the hoop band (54a).

15. A method of connecting an electrolytic cell nozzle (22) communicating with a chamber (11, 12) of an electrolysis device (10) to a header, comprising: providing a connecting pipe (50) according to any one of claims 1 to 12; inserting the electrolytic cell nozzle (22) into an annular gap (G) defined between an outer sleeve and an inner sleeve (52, 53) of the connecting pipe (50); and applying a clamping force to the outer sleeve (52) using a clamping device (54).

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