CN103016957B - Pressure-adaptive continuous drainer for gas conveying pipeline - Google Patents

Abstract

The invention discloses a pressure self-adaptive continuous drainer for gas conveying pipelines. A steam inlet pipe and a steam drainage pipe are installed on the side wall of an auxiliary cylinder body with an upper end plate and a lower end plate, and a sewage discharge pipe is arranged on the lower end wall of the main cylinder body. The wall of the main cylinder is connected with a bracket guide pipe, and the water outlet horizontal pipe passes through the bracket block and extends into the inner cavity of the main cylinder, and then connects with the drainage standpipe. Between them, the transition plate is fixedly connected to the lower side of the lower end plate of the buoy, and the guide rod at the center of the upper end plate of the buoy is in the upper guide sleeve at the center of the upper cover plate. The water inlet horizontal pipe is installed on the lower side wall of the main cylinder, the lower end of the water inlet vertical pipe is connected with the water inlet horizontal pipe, and the upper end of the water inlet vertical pipe is connected with the gas delivery main pipe through the water inlet end flange. This drainer can automatically adapt to the pressure in the gas delivery pipeline, does not need to replenish water, and is easy to maintain.

Description

Pressure-adaptive continuous drainer for gas conveying pipeline

technical field

The invention relates to a drainer, in particular to a pressure-adaptive continuous drainer for gas conveying pipelines used in industrial enterprises to remove condensed water in conveying pipelines such as gas, compressed air, steam, and natural gas.

Background technique

The pipeline used to transport gas will accumulate condensed water after a certain distance and time. In order to ensure the unimpeded delivery of gas and ensure the high efficiency and safety of use, the condensed water in the gas pipeline must be discharged, and the condensed water must be discharged (released) The equipment (or device) used is called a gas pipe drain. Before the present invention, those skilled in the art have designed or manufactured different types of drainers, such as ZL200420034909.0 "Automatic drainer without pollution and anti-gas leakage", ZL200620051238.8 "A new type of drainer for gas pipelines", ZL200720064040. 8 "Gas pipeline automatic drainer" is one of the examples. They have their own characteristics and have played different functions... But because these drainers are all water-sealed gas drainers, after a period of use, they all found the following problems:

①The applicable pressure is low and the overload capacity is small. When the medium pressure in the pipeline fluctuates too much, the drainer is easy to be broken down.

②The internal pipes and partitions of traditional drains are completely enclosed in the cylinder. If the weld seam of any one of the pipes or partitions is perforated, the entire drain can only be scrapped and cannot be repaired (that is, the repairability is poor), especially the partitions. A large number of drains simply cannot check or deal with pipeline perforation accidents.

③Due to the small pollution area and frequent dredging, the (large) maintenance workload will be increased.

④ Frequent water replenishment is required, which does not meet the requirements of energy conservation and environmental protection.

Contents of the invention

The object of the present invention is to provide a pressure-adaptive continuous gas delivery pipeline that is reliable in sealing, automatically adapts to the medium pressure in the pipeline, does not need to replenish water, is simple to manufacture, convenient to install and maintain, will not be broken down by the pressure of the pipeline, and is environmentally friendly and energy-saving. Drainage.

In order to achieve the above object, the technical solution adopted in the present invention is: the described a kind of pressure self-adaptive gas conveying pipeline continuous drainage device comprises upper guide sleeve, upper cover plate, guide rod, buoy upper end plate, fault diagnosis valve, buoy body , water inlet flange, pressure equalizing pipe, water inlet riser, water inlet horizontal pipe, blind plate, dirt filter, lower end plate of buoy, sealing column, transition plate, lower guide rod, outlet sealing ring, drainage vertical Pipe, connecting elbow, water outlet horizontal pipe, bracket blank plate, bracket flange, bracket guide pipe, sewage pipe, upper end plate, reinforcing rib, auxiliary cylinder, steam drain pipe, lower end plate, bottom support, steam inlet Pipe, observation hole and main cylinder, the lower end plate is placed on the bottom support with a number greater than or equal to 3, the upper surface of the lower end plate is fixedly connected with the auxiliary cylinder, and the outer wall of the auxiliary cylinder is respectively connected with a steam inlet pipe and a steam drain An upper end plate is fixedly connected between the upper end of the auxiliary cylinder and the lower end of the main cylinder, one end of the reinforcing rib passing through the center hole of the lower end plate is connected with the lower side of the upper end plate, and the other end of the reinforcing rib is fixedly connected to the lower end plate at the center hole.

A sewage pipe is installed on the side wall of the lower end of the main cylinder, which is 90 degrees from the sewage pipe (best). ⁰ There is an observation hole connected (fixed) on the outer wall of the main cylinder. Select the same side as the sewage pipe to be equipped with a bracket guide pipe on the side wall of the main cylinder. A bracket flange is fixedly connected to the outer wall of the end of the bracket guide pipe, the bracket blank plate is connected to the bracket flange, and the outlet horizontal pipe passes through the bracket blank plate and extends from the bracket guide tube into the inner cavity of the main cylinder It is connected to one end of the connecting elbow, and the other end of the connecting elbow is connected to the lower end of the drainage standpipe. The inner wall of the center hole at the upper end of the drainage riser is equipped with a drain outlet sealing ring, and the sealing column arranged in the center hole of the transition plate faces The drain opening on the drain riser. The position of the drainage standpipe is in the space formed by the inner periphery of the lower guide rods with a quantity greater than or equal to 2. The lower guide rods are assembled on the transition plate, and the transition plate is fixedly connected with the lower surface of the lower end plate of the buoy. The lower end plate of the buoy is fixedly connected to the lower end of the buoy body, the upper end of the buoy body is fixedly connected to the upper end plate of the buoy, and a guide rod is arranged at the center hole of the upper end plate of the buoy. An upper cover is connected to the top of the main cylinder, and an upper guide sleeve is arranged at the center of the upper cover, and the position of the guide rod is in the upper guide sleeve. A fault diagnosis valve is installed on the outer wall of the upper end of the main cylinder.

A water inlet horizontal pipe is installed on the side wall of the lower end of the main cylinder, and a blind plate is provided at the end of the water inlet horizontal pipe to block, and a dirt filter is arranged in the inner cavity of the water inlet horizontal pipe near the main cylinder, A water inlet standpipe is installed on the outer wall of the water inlet horizontal pipe between the waste filter and the blind plate and is connected, and the upper end of the water inlet standpipe is equipped with a water inlet end flange. The pressure equalizing pipe installed on the upper end of the water inlet riser communicates with the inner cavity of the main cylinder.

Compared with the prior art, the pressure-adaptive gas conveying pipeline continuous drainer provided by the above technical scheme has the following technical effects:

① Large pressure bearing capacity and wide application range. Under the pressure of 1.0-2.0MPa, it can still be used normally without breakdown. It can be widely used in the continuous and safe discharge of condensed water in gas pipeline transportation such as gas, steam, compressed air and natural gas.

② Good sealing performance. When the condensed water in the drain reaches a certain level, normal drainage can be realized. When there is no water in the drain or the hemispherical plug or conical plug of the sealing part is worn out, the sealing plug is inserted into the sealing ring under the action of gravity, completely sealing Dead drainage channels to prevent gas leakage.

③Easy maintenance. The connection between the components of the entire drain is externally welded or structured. When a problem (such as leakage) occurs somewhere (or at a certain point), it can be found without special tools. All parts can be disassembled. Partial repair, no overall maintenance, saving maintenance costs.

④ Continuous drainage can be realized, so that the drainer runs smoothly and has a long service life.

Description of drawings

Fig. 1 is a schematic front sectional view of a pressure-adaptive gas conveying pipeline continuous drain according to the present invention, which is also an abstract drawing of the present invention.

FIG. 2 is a left schematic diagram of FIG. 1 .

FIG. 3 is a rightward schematic view of FIG. 1 .

FIG. 4 is an enlarged schematic diagram of A in FIG. 1 .

FIG. 5 is a schematic diagram along the direction B of FIG. 1 .

FIG. 6 is a schematic cross-sectional view along the line F-F in FIG. 5 .

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

(As shown in Figure 1), the pressure-adaptive gas delivery pipeline continuous drainer includes drainer upper cover assembly, fault diagnosis valve 2, drainer buoy assembly, drainer inlet pipe assembly, sealing body assembly, movable Drainage pipe assembly, sewage pipe 7, steam heating chamber assembly, inspection hole (assembly) 9 and main cylinder 10, wherein the drainer upper cover assembly is composed of upper guide sleeve 1.1, upper cover plate 1.2 and guide rod 1.3; drainer buoy The assembly is composed of a buoy body 3, a buoy upper end plate 1.4 and a buoy lower end plate 5.1. The buoy upper end plate 1.4 and the buoy lower end plate 5.1 are fixedly connected to the upper end and the lower end of the buoy body 3 respectively to form a buoyant body. The shape of the buoyant body can be cylindrical , Spherical or square tube shape; The water inlet pipe assembly of the drainer is composed of a water inlet flange 4.1, a pressure equalizing pipe 4.2, a water inlet standpipe 4.3, a water inlet horizontal pipe 4.4, a blind plate 4.5 and a dirt filter 4.6. The condensed water in the gas delivery main pipeline is connected to the water inlet flange 4.1 through a branch pipe perpendicular to the ground, so that the condensed water in the gas main pipeline enters the water inlet riser 4.3, and then is introduced through the water inlet horizontal pipe 4.4 (the drainer’s ) main cylinder 10. Water inlet horizontal pipe 4.4 is installed on the lower end side wall of main cylindrical body 10, has blind plate 4.5 plugging at the end of water inlet horizontal pipe 4.4, as the standby of cleaning up dirt. Near the main cylinder 10, a dirt filter 4.6 is arranged in the inner cavity of the water inlet horizontal pipe 4.4, and the purpose is to block relatively thick debris in the water inlet horizontal pipe 4.4 so as to carry out regular centralized cleaning. Between the dirt filter 4.6 and the blind plate 4.5, a water inlet vertical pipe 4.3 is installed on the outer wall of the water inlet horizontal pipe 4.4, that is, the lower end of the water inlet vertical pipe 4.3 communicates with the water inlet horizontal pipe 4.4, and the water inlet vertical pipe 4.3 The upper end of the water inlet end flange 4.1 is installed, so that the water inlet standpipe 4.3 is connected with the gas main pipe, so that the condensed water in the gas main pipe can enter the interior of the main cylinder 10 through the water inlet riser 4.3 and the water inlet horizontal pipe 4.4. cavity. The pressure equalizing pipe 4.2 installed on the upper end of the water inlet standpipe 4.3 communicates with the inner cavity of the main cylinder body 10. When the condensed water in the gas main pipe continuously enters the main cylinder body 10 from the lower part at the beginning of use, the water in the main cylinder body 10 The air is discharged to the water inlet standpipe 4.3 through the pressure equalizing pipe 4.2 on the top, so that the pressure in the main cylinder 10 is balanced. When the pipe network pressure fluctuates up and down during use, the pressure equalizing pipe 4.2 has the function of equalizing the internal pressure of the main cylinder 10 . A fault diagnosis valve 2 is installed on the outer wall of the upper end of the main cylinder body 10. The connecting pipe assembled on the fault diagnosis valve 2 communicates with the inner cavity of the main cylinder body 10. When an accident occurs in the main cylinder body 10, the fault diagnosis valve 2 can be used. Determine the cause of the failure.

An upper cover plate 1.2 is connected to the top of the main cylinder 10, and the connection may be welding or screw connection. There is an upper guide sleeve 1.1 arranged (such as threaded connection) at the (best) central part of the upper cover plate 1.2. When working, the upper guide sleeve 1.1 is facing the guide rod 1.3, that is, the position of the guide rod 1.3 is in the upper guide sleeve 1.1, so that The guide rod 1.3 fixedly connected to the center of the upper end plate 1.4 of the buoy can only move up and down in the upper guide sleeve 1.1, but cannot move horizontally, so as to ensure Positioning is precise.

(As shown in Figure 4) The sealing body assembly is composed of the lower end plate of the buoy 5.1, the sealing column 5.2, the transition plate 5.3, the lower guide rod 5.4, the sealing ring of the drainage port 5.5 and the drainage standpipe 5.6. A transition plate 5.3 is fixedly connected to the center of the lower surface of the lower end plate 5.1 of the buoy (from the outside), and a sealing column 5.2 is arranged in the center hole of the transition plate 5.3, and the sealing column 5.2 faces the drain on the drainage standpipe 5.6. The head of the sealing column 5.2 can be hemispherical or conical. The transition plate 5.3 is equipped with a number of lower guide rods 5.4 greater than or equal to 2, and a drainage standpipe 5.6 is installed in the space formed by the inner periphery of each lower guide rod 5.4, and a drainage standpipe 5.6 is arranged in the inner wall of the center hole at the upper end of the drainage riser pipe 5.6. The sealing ring 5.5 of the drain port, when there is no condensed water in the main cylinder 10 or the condensed water does not reach a certain amount (height), the sealing column 5.2 is in close contact with the sealing ring 5.5 of the drain port to prevent gas leakage. The shape of the drain port is the same as that of the head of the sealing column 5.2, that is, hemispherical (or circular) or conical, so as to fit tightly. The lower end of the drainage standpipe 5.6 is connected to the water outlet horizontal pipe 5.8 through the connection elbow 5.7, and the water outlet end of the water outlet horizontal pipe 5.8 stretches out on the outside of the main cylinder body 10 through the bracket block plate 6.1. It can be seen from the above that the different characteristics of this sealing body assembly compared with the past drains are: ①The hemispherical or conical sealing column 5.2 is different from the original steel ball. Its front end is hemispherical or conical, and the back end is Cylindrical, fixed to the bottom of the buoy. In the normal drainage state, the hemisphere or cone plays a sealing role to obtain a linear contact sealing effect. When there is no water in the drain or the hemispherical part of the sealing column 5.2 is worn, the sealing column 5.2 is inserted into the sealing ring 5.5 of the drain port under the action of gravity to obtain a surface contact sealing effect, completely seal the drainage channel, and prevent gas leakage. ② The lower guide rods 5.4 with a number greater than or equal to 2 are uniformly (or non-uniformly) fixed on the bottom of the buoy through the transition plate 5.3, and are evenly (or non-uniformly) distributed along the outer circle of the sealing port. As the buoy moves up and down, the buoy is restricted Excessive displacement in the horizontal direction ensures accurate alignment between the sealing column 5.2 and the center of the sealing port to obtain an ideal sealing effect. ③ The sealing ring 5.5 of the drain port is made of wear-resistant and corrosion-resistant elastic sealing material, the purpose of which is to increase the tension, simplify the structure and reduce the cost.

(As shown in Figure 1) The best choice is the same side as the sewage pipe 7, and a bracket guide tube 6.3 is installed on the side wall of the main cylinder body 10, and the bracket guide tube 6.3 communicates with the inner cavity of the main cylinder body 10. A bracket flange 6.2 is fixedly connected to the outer wall of the end of the bracket guide pipe 6.3, and the bracket stuffy plate 6.1 is movably connected (such as bolted) on the bracket flange 6.2, and the outlet horizontal pipe 5.8 passes through the bracket stuffy plate 6.1 The inner cavity extending from the bracket guide tube 6.3 into the main cylinder 10 is connected with one end of the connecting elbow 5.7. Wherein said bracket guiding pipe 6.3, bracket flange 6.2 and bracket stuffy plate 6.1 form a fixed bracket, and bracket stuffy plate 6.1 is fixed on the bracket flange 6.2 by bolts. Bracket block plate 6.1 supports one end of water outlet horizontal pipe 5.8 and welds it firmly. 6.1) When performing maintenance or replacement, it can be removed from the bracket flange 6.2 for replacement or inspection.

The sewage pipe 7 with valve is installed on the side wall of the main cylinder 10 lower end, and the valve on the sewage pipe 7 is opened, and the dirt in the main cylinder 10 can be discharged from the sewage pipe 7 for centralized treatment.

(As shown in Figure 1) An upper end plate 8.1 is fixedly connected between the lower end of the main cylinder 10 and the upper end of the auxiliary cylinder 8.3, and the upper end plate 8.1 is connected (welded) to the outer wall with the main cylinder 10 and the auxiliary cylinder 8.3 . A steam inlet pipe 8.7 with a valve and a steam drain pipe 8.4 with a trap are connected to the outer wall (the left side wall and the right side wall) of the auxiliary cylinder 8.3. The bottom end of the auxiliary cylinder 8.3 is fixedly connected with a lower end plate 8.5, and the lower end plate 8.5 is placed on the bottom supports 8.6 whose number is greater than or equal to 3, and each bottom support 8.6 can be evenly or non-uniformly distributed. One end of the reinforcing rib 8.2 passing through the central hole of the lower end plate 8.5 is fixedly connected with the lower side of the upper end plate 8.1, and the other end of the reinforcing rib 8.2 is fixedly connected at the central hole of the lower end plate 8.5. The above-mentioned auxiliary cylinder body 8.3, upper end plate 8.1, lower end plate 8.5, steam inlet pipe 8.7, steam drain pipe 8.4 and reinforcing rib 8.2 constitute a steam heating chamber, which is arranged at the bottom of the main cylinder body 10 of the drainer to make drainage The device can adapt to freezing weather and cold season. The difference between this steam heating chamber and other drainers is that all the welds are within the visible range, the processing is convenient, and the quality defects are easy to find and deal with. The steam and the conveyed gas will not be connected in series, so that the safety of the drainer is guaranteed.

(As shown in Figures 2 and 3) a manhole 9 is installed (connected) on the outer wall of the main cylinder 10 above the steam heating chamber. When there is a problem inside the main cylinder 10 of the drainer, the manhole 9 on the manhole 9 can be opened Cover plate, manually handle the internal failure of the main cylinder 10.

During implementation, a pressure-adaptive type gas conveying pipeline continuous drainer is made according to the accompanying drawings, and installed on site. The drainer is connected to the gas delivery pipeline through the water inlet flange 4.1, so that the condensed water in the gas delivery pipeline will flow into the inner cavity of the main cylinder 10 through the water inlet riser 4.3 continuously. When the condensed water entering the inner cavity of the main cylinder 10 reaches a certain height (or a certain amount), the buoy located in the inner cavity of the main cylinder 10 composed of the buoy body 3, the upper end plate 1.4 of the buoy and the lower end plate 5.1 of the buoy moves upwards. When the guide rod 1.3 on the upper end plate 1.4 of the buoy moves upward in the upper guide sleeve 1.1, the upward movement of the buoy drives the transition plate 5.3, the lower guide rod 5.4 and the sealing column 5.2 which are fixedly connected with the lower end plate 5.1 of the buoy to move upward synchronously , the upward movement of the sealing column 5.2 causes the head of the sealing column 5.2 to leave the drain port seal ring 5.5 on the drain standpipe 5.6, and the condensed water in the main cylinder 10 flows out through the drain outlet on the drain standpipe 5.6 through the connecting elbow 5.7 Flow into the outlet horizontal pipe 5.8 and then discharge for centralized treatment. After the water level of the condensed water in the main cylinder body 10 inner chambers drops to a certain elevation, the buoy moves down, and the head of the sealing post 5.2 falls on the drain port seal ring 5.5 to block the drain port on the drain standpipe 5.6. The continuous floating and falling of the buoy can realize the "continuous" release of the condensed water in the inner cavity of the main cylinder body 10, and can ensure that the transported gas does not leak. After the drainer has been running for a period of time, a layer of dirt (mud) may accumulate on the bottom of the main cylinder 10. Open the valve on the sewage pipe 7 to let the float flow out. If it cannot be released, you can open the inspection hole 9 for manual cleaning. . For the drainer when encountering freezing weather, the steam inlet pipe 8.7 can be opened to allow steam to enter the auxiliary cylinder 8.3 to heat the upper end plate 8.1, so as not to allow the condensed water in the main cylinder 10 to freeze. The cooled steam is discharged through the steam drain pipe 8.4. Such cyclic operation can realize the purpose of the present invention.

Claims (5)

1. A pressure-adaptive continuous drainer for gas conveying pipelines, including an upper guide sleeve (1.1), an upper cover plate (1.2), a guide rod (1.3), an upper end plate of a buoy (1.4), a fault diagnosis valve (2), Float body (3), water inlet flange (4.1), pressure equalizing pipe (4.2), water inlet riser (4.3), water inlet horizontal pipe (4.4), blind plate (4.5), dirt filter (4.6 ), buoy lower end plate (5.1), sealing column (5.2), transition plate (5.3), lower guide rod (5.4), drain sealing ring (5.5), drain riser (5.6), connecting elbow (5.7), Water outlet horizontal pipe (5.8), bracket blank plate (6.1), bracket flange (6.2), bracket guide pipe (6.3), sewage pipe (7), upper end plate (8.1), reinforcing rib (8.2), auxiliary Cylinder (8.3), steam drain pipe (8.4), lower end plate (8.5), bottom support (8.6), steam inlet pipe (8.7), observation hole (9) and main cylinder (10), characterized in that: the lower end The plate (8.5) is placed on the bottom support (8.6) whose number is greater than or equal to 3, the upper surface of the lower end plate (8.5) is fixedly connected with the auxiliary cylinder (8.3), and the outer wall of the auxiliary cylinder (8.3) is respectively connected with steam The inlet pipe (8.7) and the steam drain pipe (8.4), the upper end plate (8.1) is fixedly connected between the upper end of the auxiliary cylinder (8.3) and the lower end of the main cylinder (10), and passes through the center hole of the lower end plate (8.5) One end of the reinforcing rib (8.2) is connected to the lower side of the upper end plate (8.1), and the other end of the reinforcing rib (8.2) is fixedly connected to the center hole of the lower end plate (8.5); A sewage pipe (7) is installed on the lower end side wall of the main cylinder (10), which is 90 degrees from the sewage pipe (7). ⁰ There is an observation hole (9) connected to the outer wall of the main cylinder (10); select the same side as the sewage pipe (7) to install a bracket guide tube (6.3) on the side wall of the main cylinder (10), and guide it on the bracket The outer wall of the end of the pipe (6.3) is fixedly connected with the bracket flange (6.2), the bracket blank plate (6.1) is connected with the bracket flange (6.2), and the outlet horizontal pipe (5.8) passes through the bracket blank plate (6.1 ) extends from the bracket guide tube (6.3) into the inner cavity of the main cylinder (10) and connects with one end of the connecting elbow (5.7), and the other end of the connecting elbow (5.7) connects with the lower end of the drainage standpipe (5.6) , the inner wall of the center hole at the upper end of the drain standpipe (5.6) is equipped with a drain outlet seal ring (5.5), and the seal column (5.2) arranged in the center hole of the transition plate (5.3) faces the drain outlet on the drain standpipe (5.6) ;The position of the drainage riser (5.6) is in the space formed by the inner periphery of the lower guide rods (5.4) with a quantity greater than or equal to 2, the lower guide rods (5.4) are assembled on the transition plate (5.3), and the transition plate (5.3) is the same as the buoy The lower surface of the lower end plate (5.1) is fixed; the lower end plate of the buoy (5.1) is fixed to the lower end of the buoy body (3), and the upper end of the buoy body (3) is fixed to the upper end plate of the buoy (1.4). (1.4) is equipped with a guide rod (1.3) at the center hole; an upper cover (1.2) is connected to the top of the main cylinder (10), and an upper guide sleeve (1.1) is arranged at the center of the upper cover (1.2). ), the position of the guide rod (1.3) is in the upper guide sleeve (1.1), and a fault diagnosis valve (2) is installed on the outer wall of the upper end of the main cylinder (10); The water inlet horizontal pipe (4.4) is installed on the lower end side wall of the main cylinder (10), and the end of the water inlet horizontal pipe (4.4) is blocked by a blind plate (4.5). A dirt filter (4.6) is installed in the inner cavity of the water horizontal pipe (4.4), and a water inlet stand is installed on the outer wall of the water inlet horizontal pipe (4.4) between the dirt filter (4.6) and the blind plate (4.5). The pipes (4.3) are connected together, and the upper end of the water inlet riser (4.3) is equipped with a water inlet flange (4.1); the upper end of the water inlet riser (4.3) is connected to the main cylinder (10 ) of the lumen. 2. A pressure-adaptive continuous drainer for gas delivery pipelines according to claim 1, characterized in that the head of the sealing column (5.2) is hemispherical or conical. 3. A pressure-adaptive continuous drainer for gas conveying pipelines according to claim 1, characterized in that: the lower guide rods (5.4) assembled on the transition plate (5.3) are evenly or non-uniformly distributed. 4. A pressure-adaptive continuous drainer for gas delivery pipelines according to claim 1, characterized in that: the main cylinder (10) and the auxiliary cylinder (8.3) are circular or square. 5. A pressure-adaptive continuous drainer for gas conveying pipelines according to claim 1, characterized in that: the buoy body composed of buoy body (3), buoy upper end plate (1.4) and buoy lower end plate (5.1) is Cylindrical, spherical or square.