Cooling air pipe for a bottom of an electrolysis tank

Abstract

Cooling air pipe for a bottom of an electrolysis tank, comprising: one or more connecting pipes (1), wherein exhaust air pipes (2) are arranged on each connecting pipe (1) at a distance from one another, and wherein outlet ends of the exhaust air pipes (2) face the bottom of the electrolysis tank; a flange (3) arranged at each end of a connecting pipe (1), two of the connecting pipes (1) being connected to each other via the flange (3); an air supply arrangement (4) connected to a first end of the connected connecting pipe (1); and a plug (5) arranged at a second end of the connected connecting pipe (1).

Description

Technical area

[0001] The invention belongs to the field of metalworking and relates to a cooling air pipe for a bottom of an electrolysis tank. Background technology

[0002] In large aluminum electrolysis tanks, especially at high current densities, the bottom of the tank exhibits a very high heat flux density. This heat not only endangers workers near the tank but also increases the temperature of the conductive busbars within the electrolysis tank, leading to increased resistance and increased deformation of the busbars, especially during the start-up phase of the electrolysis tank. In recent years, with the increase in current intensity and especially the anode current density of the electrolysis tanks, the requirements for the heat dissipation capacity of the side walls of the electrolysis tank have also increased. One measure to improve heat dissipation from the bottom surface is the welding of steel cooling fins (thin steel sheets) to increase the heat dissipation area.However, welding cooling fins compromises the strength of the electrolysis tank shell and increases the deformation of the electrolysis tank shell. Therefore, the number of cooling fins cannot be too large, and even with cooling fins, heat cannot be effectively dissipated during the start-up phase of the electrolysis tank, which limits its practical effect. Content of the utility model

[0003] Based on this, the present invention is based on the object of addressing at least one of the problems of the prior art mentioned.

[0004] To solve this problem, the invention proposes a cooling air pipe for a bottom of an electrolysis tank, which comprises: one or more connecting pipes, wherein exhaust pipes are arranged on each connecting pipe at a distance from one another, and wherein outlet ends of the exhaust pipes face the bottom of the electrolysis tank; a flange arranged at each end of a connecting pipe, two of the connecting pipes being connected to each other via the flange; an air supply assembly connected to a first end of the connected connecting pipe; and a plug disposed at the second end of the connected connecting pipe.

[0005] Air nozzles are preferably arranged on the exhaust air pipes, which are located below the bottom of the electrolysis tank.

[0006] A control valve is preferably arranged on each of the exhaust air pipes.

[0007] Preferably, a plug-in socket is arranged at the second end of the connecting pipe and a plug-in groove adapted to the plug-in socket is arranged at the first end.

[0008] Preferably, the supply air arrangement comprises: an air source; an air supply pipe whose first end is connected to the air source; a connector arranged on the plug-in groove, wherein a second end of the supply air pipe is connected to the connector.

[0009] Preferably, the cooling air pipe further comprises a moving frame comprising a stand and a plurality of omni-directional wheels, wherein the connecting pipe is arranged above the stand, and the omni-directional wheels (13) are arranged below the moving frame (11).

[0010] Preferably, a height adjustment arrangement is arranged between the stand and the connecting tube.

[0011] Preferably, the height adjustment arrangement comprises: a sleeve arranged on the stand; a connecting rod arranged on a side of the connecting pipe facing away from the exhaust air pipes and arranged to be displaceable in the sleeve; and a locating part arranged on the sleeve to fix the plug rod.

[0012] Preferably, several locating holes are arranged on the plug rod at a distance from one another.

[0013] Preferably, the locating part is a threaded pin that can be inserted into the locating holes. Positive effect

[0014] In the exemplary embodiments of the invention, a cooling air pipe for the floor of an electrolysis tank is proposed. The connecting pipe can be connected to an existing air compression system by coupling it with the supply air pipe. Compressed air is expelled directly onto the floor of the electrolysis tank through the air nozzles above the connecting pipe to achieve an effective cooling effect for the electrolysis. A moving frame is arranged below the connecting pipe to enable flexible movement. Multiple connecting pipes can be connected via the flange to meet the requirements of different applications. Furthermore, the height of the connecting pipe is adjustable to adapt to the floor of the electrolysis tank at different heights, which significantly improves usability and universality. Illustration of the attached drawings Fig. 1 shows a main view of a cooling air pipe; Fig. 2 shows a structural diagram of the height adjustment arrangement; and Fig. 3 shows a structural representation of a first end of a connecting pipe. Reference symbol:

[0015] 1 Connecting pipe; 2 Exhaust pipe; 3 Flange; 4 Supply air assembly; 5 Plug; 6 Air nozzle; 7 Control valve; 8 Plug socket; 9 Supply air pipe; 10 Connector; 11 Moving frame; 12 Stand; 13 Omni-directional wheel; 14 Height adjustment assembly; 15 Sleeve; 16 Plug rod; 17 Locating part; 18 Locating hole. Specific embodiments

[0016] In describing the present invention, it should be understood that the orientations or positional relationships described with terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "top," "bottom," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," etc., refer to the orientations or positional relationships illustrated in the accompanying drawings. These terms are used only to simplify the description of the present invention and are not intended to indicate or imply that the designated devices or components must have a particular orientation or be designed and operated in a particular orientation. Therefore, they should not be construed as limiting the present invention.

[0017] Furthermore, the terms "first," "second," and "second" are used for descriptive purposes only and should not be understood as an indication or suggestion of the relative importance or as an implicit statement of the number of the technical features referred to. Thus, the features identified by the terms "first," "second," and "second" may explicitly or implicitly encompass one or more of these features. In the description of the present invention, "multiple" means two or more, unless explicitly stated otherwise.

[0018] In the present invention, the terms "assemble," "connect," "connect," "attach," "fix," etc., are to be understood in a broad sense unless explicitly stated otherwise. For example, it can be a fixed connection, a detachable connection, or a one-piece connection. It can also be a mechanical or electrical connection. It can also be a direct connection or an indirect connection via an intermediate means. Or it can be a connection between the interiors of two elements. For one of ordinary skill in the art, the above terms can understand the specific meaning in the present invention depending on the specific circumstances.

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the present invention.

[0020] With reference to the Fig. 1-3, according to one embodiment of the present invention, a cooling air pipe for a bottom of an electrolysis tank is proposed. The cooling air pipe comprises: one or more connecting pipes 1, wherein on each connecting pipe 1 exhaust air pipes 2 are arranged at a distance from one another, and wherein outlet ends of the exhaust air pipes 2 face the bottom of the electrolysis tank; a flange 3 arranged at each end of a connecting pipe 1, two of the connecting pipes 1 being connected to each other via the flange 3; an air supply arrangement 4 connected to a first end of the connected connecting pipe 1; and a plug 5 arranged at the second end of the connected connecting pipe 1.

[0021] Specifically, the exhaust pipes 2 are spaced apart from each other on the pipe body of the connecting pipe 1 and facing the bottom of the electrolysis tank. When compressed air enters the connecting pipe 1 via the air supply assembly 4, it can be expelled through the individual exhaust pipes 2 onto the bottom of the electrolysis tank, providing sufficient airflow to the bottom of the electrolysis tank and effectively dissipating the heat generated at the bottom to achieve comprehensive and efficient cooling. At the bottom of a large electrolysis tank, the number of exhaust pipes 2 is increased accordingly, and the spacing between them is reduced accordingly, to ensure uniform heat dissipation across the large-area floor. In contrast, for a small or specially shaped electrolysis tank, the arrangement of the exhaust pipes 2 is flexibly adjusted according to the actual conditions to achieve the maximum cooling effect.

[0022] The flange 3 is arranged at both ends of the connecting pipe 1. Two connecting pipes 1 can be easily connected via the flange 3. In practical application, operators can quickly assemble several groups of connecting pipes 1 when cooling electrolysis tanks of different sizes or cooling a larger electrolysis area. The flanges 3 are connected with high-strength bolts to ensure a tight and firm connection, so that no air leakage occurs under the high pressure of the compressed air. This modular arrangement not only meets the cooling area requirements of various applications but also facilitates transportation and storage. During transport, the connecting pipes 1 can be disassembled into individual parts to reduce space requirements. When needed, they can then be quickly assembled via the flanges 3, which greatly improves work efficiency.

[0023] The supply air assembly 4 is connected to the first end of the connecting pipe 1 and serves as the drive source. The plug 5 is arranged at the second end of the connected connecting pipe 1 and can effectively close the end of the connecting pipe 1 to prevent compressed air from escaping from the end. This ensures that all the compressed air is expelled through the exhaust pipes 2 to the bottom of the electrolysis tank, thereby improving the efficiency of compressed air utilization. The plug 5 is usually made of a material with good sealing properties and a certain compressive strength, such as rubber or high-strength plastic. When installing the plug 5, a screw connection or a snap connection is used to ensure that it fits tightly against the connecting pipe 1 and will not loosen or come off over time.In addition, when cleaning or maintenance of the interior of the connecting pipe 1 is required, the plug 5 can be easily removed to facilitate the operators' work.

[0024] Air nozzles 6 are arranged on the exhaust air pipes 2 and are located below the bottom of the electrolysis tank.

[0025] In particular, the air nozzles 6 are mounted on the exhaust pipes 2 and located below the bottom of the electrolysis tank, allowing the compressed air to directly impact the heat-generating parts of the tank upon exiting, quickly dissipating the heat at the bottom. Furthermore, the air nozzles 6 are kept at an appropriate distance from the tank bottom to ensure that the air flow impacts the tank bottom sufficiently to dissipate the heat, but also to prevent mechanical damage to the tank bottom due to insufficient clearance.

[0026] The air nozzles 6 have a square structure. Compared with conventional round air nozzles 6, square air nozzles 6 can provide more uniform and concentrated air distribution. When the compressed air from the connecting pipe 1 passes through the exhaust pipes 2 to the square air nozzles 6, the square structure of the air nozzles 6 causes the airflow to form a flat airflow jet upon exiting. This airflow shape can more comprehensively cover the area below the bottom of the electrolysis tank. At the bottom of the electrolysis tank, heat generation may vary at different locations. The square air nozzles 6 can direct the airflow to the areas that need more cooling according to the shape and heat distribution at the bottom.For example, the square air nozzle 6 at the edges of the bottom of the electrolysis tank or near the electrodes, where more heat is generated due to the higher current density, can direct the air flow more towards these high-temperature areas by adjusting their mounting angles and positions to effectively improve the cooling effect.

[0027] A control valve 7 is arranged on each of the exhaust air pipes 2.

[0028] Specifically, the control valve 7 is used to control the pressure flow of compressed air in the exhaust pipes 2. The control valve 7 can be operated manually by the operator or by an automated control system based on the temperature monitoring data and the actual cooling requirements at the bottom of the tank. When the temperature at the bottom of the tank is low, the opening of the control valve 7 is reduced. This reduces the pressure flow of compressed air through the exhaust pipe 2, avoiding the energy waste caused by excessive cooling and the potential negative impact on the electrolysis process.If, on the other hand, the temperature at the bottom of the tank is too high, the opening of the control valve 7 is increased so that more compressed air can flow quickly through the exhaust pipes 2 and is expelled via the square air nozzles 6 onto the bottom of the electrolysis tank to enhance the cooling effect and quickly reduce the temperature at the bottom.

[0029] The control valve 7 is located at one end of an exhaust pipe 2, which is close to the connecting pipe 1. This allows the control valve 7 to regulate the flow of compressed air as it enters the exhaust pipe 2, ensuring that the air flow exiting the entire exhaust pipes 2 and the individual square air nozzles 6 can be maintained at a stable, demand-based flow rate. Furthermore, the control range of the control valve 7 is highly flexible, which can be adapted to the cooling needs of different sizes and types of electrolysis tanks. For both small experimental electrolysis devices and large industrial electrolysis tanks, the control valve 7 can regulate the flow of compressed air to the optimal level depending on the actual conditions.

[0030] At the second end of the connecting pipe 1, a plug-in socket 8 is arranged, and at the first end of the connecting pipe 1, a plug-in groove adapted to the plug-in socket 8 is arranged.

[0031] In particular, the plug-in connector 8 located at the second end of the connecting pipe 1 has a shape and size that corresponds to the plug-in groove at the first end of the connecting pipe 1. The plug-in connector 8 is typically made of a high-strength material with a certain degree of toughness, such as a high-quality metal or a high-performance plastic. This choice of material ensures that the plug-in connector 8 is not easily damaged during frequent insertion and removal, but also provides sufficient strength and stability during the connection.

[0032] The internal structure of the plug-in groove at the first end of the connecting pipe 1 matches the plug-in fitting 8, forming a tight fit when the two are connected. During assembly, when the operator aligns and inserts the plug-in fitting 8 with the plug-in groove, the plug-in fitting 8 is gradually embedded in the plug-in groove until it reaches a predetermined depth. At this time, the assembly gasket between the plug-in fitting 8 and the plug-in groove ensures the tightness of the connection and effectively prevents compressed air from leaking at the joint.

[0033] The supply air arrangement 4 includes: an air source; an air supply pipe 9, the first end of which is connected to the air source; a connection 10 arranged on the plug-in groove, wherein a second end of the supply air pipe 9 is connected to the connection 10.

[0034] In particular, the air source serving as the power source of the supply air assembly 4 is typically an air compression device. These devices can compress air from the atmosphere, thus achieving sufficient pressure to provide the required air flow for cooling the bottom of the electrolysis tank. Electrolysis production workshops of different sizes are equipped with appropriately sized air source devices depending on actual requirements. For example, in a large industrial electrolysis workshop, due to the need to cool a large number of electrolyzers, a powerful and large-volume air compressor is used to ensure a continuous and stable supply of compressed air with sufficient pressure and flow.For small experimental electrolysis devices, however, a small portable air source device can be used, which is smaller but can also provide the required cooling air flow for the bottom of the electrolysis tank during the experimental process.

[0035] The supply air pipe 9 connects the air source to the connecting pipe 1. The supply air pipe 9 is typically made of a material with good pressure resistance, such as a high-strength metal pipe or a special pressure-resistant rubber pipe. These materials can withstand the high pressure output from the air source and prevent pipe rupture or air leakage during transportation. The connector 10 is arranged on the plug-in groove at the first end of the connecting pipe 1 and is connected to the plug-in groove by a screw connection or a snap-in connection or the like. This connection method is characterized by simple assembly and firm connection and can ensure that the plug-in groove and the connector 10 will not become loose or leak air under the high pressure of the compressed air.

[0036] An internal thread is provided in the plug-in groove and an external thread is provided at connection 10. Connection 10 is connected to the plug-in groove via a screw connection, which facilitates assembly and disassembly.

[0037] The cooling air pipe further includes a moving frame 11 comprising a stand 12 and a plurality of omnidirectional wheels 13. The connecting pipe 1 is arranged above the stand 12, and the omnidirectional wheels 13 are arranged below the moving frame 11.

[0038] Specifically, the moving frame 11 includes a stand 12 and a plurality of omnidirectional wheels 13. The stand 12, as the main supporting structure of the moving frame 11, is made of a strong and durable material, such as high-strength steel or high-quality aluminum alloys. The connecting pipe 1 is firmly mounted on the stand 12 via welding, bolts, or special fixing clamps. This stable connection ensures that the connecting pipe 1 does not shake or shift during movement, ensuring the normal conveyance of compressed air in the pipe and the stable cooling of the bottom of the electrolysis tank. At the same time, the frame of the stand 12 also has a certain strength and rigidity to withstand the forces resulting from the connecting pipe 1 and possible external impacts, and to prevent it from deformation or damage during use.

[0039] The omnidirectional wheels 13 are mounted below the moving frame 11 and provide the moving frame 11 with flexibility of movement. In the complex environment of an electrolysis workshop, the operator can easily push the moving frame 11 and quickly move the connecting pipe 1 to the position of the electrolysis tank that requires cooling.

[0040] A height adjustment arrangement 14 is arranged between the stand 12 and the connecting tube 1.

[0041] Specifically, the height adjustment assembly 14 is mounted between the connecting pipe 1 and the stand 12 and can adjust the height of the connecting pipe 1. The floors of electrolysis tanks of different sizes have different heights. Even for the same electrolysis tank, the effective cooling height at the bottom may change at different production stages due to electrode wear, material addition, and other factors. The height adjustment assembly 14 allows the operator to flexibly adjust the height of the connecting pipe 1 according to actual conditions. For example, in a large industrial electrolysis tank with a higher floor, the operator can raise the connecting pipe 1 to the appropriate height via the height adjustment assembly 14 to ensure that the square air nozzles 6 are located at the best cooling position below the floor.In a small experimental electrolysis tank, however, the height can be reduced so that the air flow can act more precisely and efficiently on the bottom of the electrolysis tank.

[0042] The height adjustment arrangement 14 comprises: a sleeve 15 arranged on the stand 12; a connecting rod 16, which is arranged on a side of the connecting pipe 1 facing away from the exhaust air pipes 2 and is slidably arranged in the sleeve 15; and a locating part 17 arranged on the sleeve 15 to fix the plug rod 16.

[0043] Specifically, the height adjustment assembly 14 includes a sleeve 15, a connecting rod 16, and a locating part 17. The sleeve 15 is securely mounted on the stand 12. The inner wall of the sleeve 15 is finely machined and has a smooth surface, providing good guidance and low friction for the sliding of the connecting rod 16. The inner diameter of the sleeve 15 precisely matches the outer diameter of the connecting rod 16 to both ensure that the connecting rod 16 can slide smoothly within the sleeve 15 and prevent the connecting pipe 1 from wobbling or deflecting during use due to an excessive gap. This ensures that the cooling airflow is precisely directed to the bottom of the electrolysis tank.

[0044] The connecting rod 16 is arranged on a side of the connecting pipe 1 facing away from the exhaust pipes 2 and is firmly connected to the connecting pipe 1, for example by welding or screwing, to form a whole. The connecting rod 16 can slide freely within the sleeve 15, so that the height of the connecting pipe 1 can be adjusted as needed. If the connecting pipe 1 needs to be raised, the operator only needs to pull the connecting pipe 1 upward, and the connecting rod 16 slides upward within the sleeve 15. If, on the other hand, the height of the connecting pipe 1 needs to be reduced, the connecting pipe 1 can simply be pushed down. The locating part 17 is arranged on the sleeve 15 for fixing the connecting rod 16 to ensure that the connecting pipe 1 remains stable after being adjusted to the appropriate height. The locating part 17 can be designed as a screw, a pin, or a clamp.For example, with a locating part 17 in the form of a screw, the operator screws the locating part 17 onto the sleeve 15 after adjusting the connecting tube 1 to the desired height. The end of the locating part 17 presses firmly against the surface of the connecting rod 16, and the frictional force fixes the connecting rod 16 in the sleeve 15, thus preventing it from shifting during use. A locating part 17 in the form of a pin fixes the connecting rod 16 by inserting it into the corresponding holes in the sleeve 15 and the connecting rod 16.

[0045] Several locating holes 18 are arranged at a distance from one another on the plug rod 16.

[0046] The localization part 17 is designed as a threaded pin that can be inserted into the localization holes 18.

[0047] Specifically, the locating holes 18 are provided at equal intervals on the connecting rod 16. The spacing between the locating holes 18 is uniform and appropriate to meet both the accuracy of the height adjustment of the connecting pipe 1 and the requirements of different height adjustment ranges. For example, for the typical height change range of the bottom of an electrolysis tank, an appropriate spacing between the locating holes 18 allows the connecting pipe 1 to be adjusted in small height increments to precisely adapt to the bottoms of electrolysis tanks of different sizes and to the bottom heights under different operating conditions. For example, in a special electrolysis process that requires very precise temperature control, the distance between the square air nozzle 6 and the bottom can be accurately adjusted within a very small range.In this case, the evenly spaced locating holes 18 can allow the operator to adjust the connecting pipe 1 to the optimal height to ensure that the cooling air flow acts on the floor at the best angle and with the best strength, thus achieving efficient cooling.

[0048] The threaded pin as the locating part 17 can wedge itself firmly into the inner wall of the locating hole 18 due to its threaded structure when inserted into the locating hole 18. Once the connecting tube 1 is adjusted to the desired height, the operator only needs to screw the threaded pin into the corresponding locating hole 18. The frictional force and self-locking of the thread prevent the threaded pin from easily loosening or falling out, thereby stably fixing the plug rod 16 in the sleeve 15. This fixing method can effectively withstand the various external forces to which the connecting tube 1 is subjected during use, such as the impact force of airflow and the vibration of the device, and ensures that the connecting tube 1 always remains at the set height and the cooling function operates stably.

[0049] The interaction of the threaded pin and the locating hole 18 also ensures good repeatability and interchangeability. When the height of the connecting tube 1 needs to be readjusted, the operator only needs to unscrew the threaded bolt, move the connecting rod 16 in the sleeve 15 to the new height, and then screw the threaded pin into the corresponding locating hole 18. Since the locating holes 18 are evenly spaced, regardless of the height to which the connecting tube 1 is adjusted, a suitable locating hole 18 can always be found for interaction with the threaded pin, allowing for quick and easy height adjustment. Furthermore, it is very easy to replace a new threaded pin when the old one becomes worn or damaged, without affecting the normal use of the entire height adjustment assembly 14.

[0050] The above descriptions are only the preferred embodiments of the present invention and are not intended to limit the present invention. All changes, equivalents, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above descriptions are only the preferred embodiments of the present invention. It should be noted that some improvements and modifications can be made by those skilled in the art without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as being within the scope of the present invention.

[0051] The invention relates to a cooling air pipe for the floor of an electrolysis tank, wherein the cooling air pipe comprises: one or more connecting pipes, wherein exhaust air pipes are arranged spaced apart on each connecting pipe, a flange arranged at each end of a connecting pipe, wherein two of the connecting pipes are connected to each other via the flange; an air supply arrangement connected to a first end of the connected connecting pipe; and a plug arranged at the second end of the connected connecting pipe. The advantageous embodiment has the advantage that the connecting pipe can be connected to an existing air compression system by coupling it to the air supply pipe. Compressed air is expelled through the air nozzles above the connecting pipe directly onto the floor of the electrolysis tank to achieve an effective cooling effect for the electrolysis.A moving frame is arranged below the connecting tube to enable flexible movement. Multiple connecting tubes can be connected via the flange to meet the requirements of different applications.

Claims

[1] Cooling air pipe for a bottom of an electrolysis tank, comprising: one or more connecting pipes (1), wherein exhaust air pipes (2) are arranged on each connecting pipe (1) at a distance from one another, and wherein outlet ends of the exhaust air pipes (2) face the bottom of the electrolysis tank; a flange (3) arranged at each end of a connecting pipe (1), two of the connecting pipes (1) being connected to each other via the flange (3); an air supply arrangement (4) connected to a first end of the connected connecting pipe (1); and a plug (5) arranged at a second end of the connected connecting pipe (1). [2] Cooling air pipe according to claim 1, characterized by that air nozzles (6) are arranged on the exhaust air pipes (2) and are located below the bottom of the electrolysis tank. [3] Cooling air pipe according to claim 1, characterized bythat a control valve (7) is arranged on each of the exhaust air pipes (2). [4] Cooling air pipe according to claim 1, characterized by that a plug-in socket (8) is arranged at the second end of the connecting pipe (1) and a plug-in groove adapted to the plug-in socket (8) is arranged at the first end. [5] Cooling air pipe according to claim 4, characterized by that the supply air arrangement (4) comprises: an air source; an air supply pipe (9) whose first end is connected to the air source; a connection (10) arranged on the plug-in groove, wherein a second end of the supply air pipe (9) is connected to the connection (10). [6] The cooling air pipe according to claim 1, further comprising a moving frame (11) comprising a stand (12) and a plurality of omni-directional wheels (13), wherein the connecting pipe (1) is arranged above the stand (12), and the omni-directional wheels (13) are arranged below the moving frame (11). [7] Cooling air pipe according to claim 6, characterized by that a height adjustment arrangement (14) is arranged between the stand (12) and the connecting tube (1). [8] Cooling air pipe according to claim 7, characterized by that the height adjustment arrangement (14) comprises: a sleeve (15) arranged on the stand (12); a connecting rod (16) which is arranged on a side of the connecting pipe (1) facing away from the exhaust air pipes (2) and is arranged displaceably in the sleeve (15); and a locating part (17) arranged on the sleeve (15) to fix the plug rod (16). [9] Cooling air pipe according to claim 8, characterized by that several locating holes (18) are arranged at a distance from one another on the plug rod (16). [10] Cooling air pipe according to claim 9, characterized bythat the locating part (17) is a threaded pin that can be inserted into the locating holes (18).

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