Segmented shaft type draft tube access door

Abstract

The invention discloses a segmented shaft type draft tube manhole, which relates to the technical field of power plant site construction and comprises a manhole door, a manhole door lower hinge support and a manhole door upper hinge support. The manhole door lower hinge support and the manhole door upper hinge support are arranged on the same side of the manhole door and connected with the draft tube wall. The manhole door lower hinge support comprises a first hinge shaft and a first connecting piece, and the manhole door upper hinge support comprises a second hinge shaft and a second connecting piece; the first connecting piece is connected with a first supporting seat of the draft tube wall through a first hinge shaft, and the second connecting piece is connected with a second supporting seat of the draft tube wall through a second hinge shaft. The two sections of segmented shafts are used, overhaul and maintenance work can be carried out independently under the condition that fastening bolts of the two hinged supports are disassembled, any part can be replaced at any time, the opening and closing state of the draft tube mandoor is not affected, installation and disassembly are convenient, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of on-site construction of power plants, in particular to a segmented axial tailwater pipe entry door. Background Art

[0002] The tailwater pipe entrance door is a door opening set between the turbine volute and the tailwater pipe for maintenance personnel to enter and exit. At present, most of the tailwater pipe entrance doors are made of cast iron. One end of the hinge on the door is embedded in the concrete foundation, and the other end is an integrated structure with the tailwater pipe entrance door. The upper and lower hinges are connected by a long shaft with a thick top and a thin bottom. After installation, concrete is poured in the upper and lower sections to prevent movement. The door and the base are sealed with a sealing gasket, which has a high requirement for the roughness of the base. In addition, it is time-consuming and laborious to open and close the tailwater pipe entrance door.

[0003] The tailwater pipe entrance door is in a humid environment for a long time. The hinges embedded in the concrete foundation are made of cast iron and are severely corroded. Repeated opening and closing causes wear of the door shaft, resulting in excessive hinge installation clearance. In addition, due to the influence of the door's own weight for a long time, the door body hangs down, and each opening and closing is extremely time-consuming and laborious. If the door shaft needs to be replaced, the upper and lower concrete foundations of the door shaft need to be excavated, and the door shaft needs to be pushed out from the bottom to the top with a jack. The installation of the new shaft requires it to be passed through the upper and lower hinges and then tightened with a hammer. The height of the gasket between the door hinge and the embedded hinge is adjusted to ensure that the door body is installed evenly and straight. The whole process is relatively cumbersome, time-consuming and labor-intensive. In addition, since the door and the base are sealed with a sealing gasket, the roughness of the base is required to be high, and water seepage is prone to occur if the base is not pressed firmly.

[0004] Therefore, a professional and practical labor-saving tailwater pipe entrance door is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the deficiencies in the prior art and to design a segmented shaft tailwater pipe entry door, which can reduce operation time, improve maintenance efficiency, reduce operating torque, effectively protect construction personnel, solve deformation and rust problems, and the door shaft is easily removable.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] The present invention provides a segmented axial tailwater pipe entry door, comprising:

[0008] Manhole door, lower hinged branch of manhole door, upper hinged branch of manhole door;

[0009] The lower hinge branch of the manhole door and the upper hinge branch of the manhole door are arranged on the same side of the manhole door and connected to the tailwater pipe wall;

[0010] The lower hinge of the manhole door includes a first hinge shaft and a first connecting member, and the upper hinge of the manhole door includes a second hinge shaft and a second connecting member;

[0011] The first connecting member is connected to a first supporting seat of the tailwater pipe wall via a first hinge shaft, and the second connecting member is connected to a second supporting seat of the tailwater pipe wall via a second hinge shaft.

[0012] As a preferred embodiment of the present invention, one-way thrust bearings are arranged on the first hinge shaft and the second hinge shaft, and the one-way thrust bearings are rolling bearings.

[0013] As a preferred embodiment of the present invention, the first connecting member is connected to the first hinge shaft via a first set screw group; the second connecting member is connected to the second hinge shaft via a second set screw group.

[0014] As a preferred embodiment of the present invention, the first set screw group includes a first fixing bolt and a first adjusting bolt, the first fixing bolt is used to connect the first connecting member to the first hinge shaft, and the first adjusting bolt is used to adjust the position of the first connecting member;

[0015] The second set screw group includes a second fixing bolt and a second adjusting bolt, the second fixing bolt is used to connect the second connecting member to the second hinge shaft, and the second adjusting bolt is used to adjust the position of the second connecting member.

[0016] As a preferred embodiment of the present invention, a first spring washer and a first flat washer are arranged on the first fixing bolt, and further, a second spring washer, a second flat washer and a second adjusting washer are arranged on the second adjusting bolt.

[0017] As a preferred embodiment of the present invention, O-rings are provided between the first connecting member and the first hinge shaft, and between the second connecting member and the second hinge shaft.

[0018] As a preferred embodiment of the present invention, a packing groove is arranged on the inner side of the manhole door, and a sealing packing is arranged in the packing groove.

[0019] As a preferred embodiment of the present invention, reinforcing ribs are arranged inside the manhole door, and the reinforcing ribs include transverse reinforcing ribs and longitudinal reinforcing ribs.

[0020] As a preferred embodiment of the present invention, a door handle is arranged on the manhole door.

[0021] As a preferred embodiment of the present invention, the manhole door is made of stainless steel.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses a two-section segmented shaft, and the inspection and maintenance work can be carried out separately by disassembling the fastening bolts of the two hinges. Any component can be replaced at any time without affecting the opening and closing state of the tailwater pipe entrance door. The installation and disassembly are convenient, and the maintenance efficiency is improved.

[0024] 2. The invention uses rolling bearings at the hinge to increase the support of the hinge and reduce friction and save effort;

[0025] 3. The present invention adopts a detachable hinge structure, which can reduce the problem of excessive lateral force on the door shaft caused by deformation of the sealing gasket when the tailwater door is tightened, thereby affecting the sealing effect.

[0026] 4. The present invention adds a packing groove on the inner side of the door, and can flexibly adopt suitable sealing packing according to the corrosion condition of the base; during installation, the packing can be placed first to evenly tighten the door body, and then the upper and lower hinges can be installed and fixed to the door body, and then the upper and lower door shafts are respectively inserted to connect the concrete embedded hinges, and the level and height are adjusted by gaskets, and finally the bolts are tightened.

[0027] 5. The present invention provides a first fixing bolt group and a second fixing bolt group to ensure that when the tailwater pipe inlet door is closed, the door body bolts can be tightened first to evenly press the sealing ring, and then the upper and lower door hinges can be installed, thereby avoiding the phenomenon of door shaft being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the segmented axial tailwater pipe entry door proposed by the present invention;

[0029] Figure 2 A top view of the segmented axial tailwater pipe entrance door proposed by the present invention;

[0030] Figure 3 A side view of the segmented axial tailwater pipe entrance door proposed by the present invention;

[0031] Figure 4 This is a diagram of the lower hinge structure of the manhole door proposed by the present invention;

[0032] Figure 5 A top view of the structure of the lower hinge of the manhole door proposed by the present invention;

[0033] As shown in the figure:

[0034] 1-manhole door, 2-manhole door lower hinge, 3-manhole door upper hinge, 4-tailwater pipe wall;

[0035] 101-packing groove, 102-sealing packing, 103-reinforcement rib, 104-door handle;

[0036] 131- transverse reinforcement ribs, 132- longitudinal reinforcement ribs;

[0037] 201-first hinge shaft, 202-first connecting member, 203-first set screw assembly;

[0038] 231 - first fixing bolt, 232 - first adjusting bolt, 233 - first spring washer, 234 - first flat washer, 235 - second spring washer, 236 - second flat washer, 237 - second adjusting washer;

[0039] 301 - second hinge shaft, 302 - second connecting member, 303 - second set screw assembly;

[0040] 401-first support base, 402-second support base. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0042] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0043] like Figures 1 to 5 As shown, the present invention provides a segmented axis type tailwater pipe entry door, comprising: an entry manhole door 1, a lower hinge branch 2 of the entry manhole door, and an upper hinge branch 3 of the entry manhole door; the lower hinge branch 2 of the entry manhole door and the upper hinge branch 3 of the entry manhole door are arranged on the same side of the entry manhole door 1 and are connected to the tailwater pipe wall 4; the lower hinge branch 2 of the entry manhole door comprises a first hinge shaft 201 and a first connecting member 202, and the upper hinge branch 3 of the entry manhole door comprises a second hinge shaft 301 and a second connecting member 302; the first connecting member 202 is connected to a first support seat 401 of the tailwater pipe wall 4 through the first hinge shaft 201, and the second connecting member 302 is connected to a second support seat 402 of the tailwater pipe wall 4 through the second hinge shaft 301.

[0044] The segmented tailwater pipe entrance door provided by the present invention connects the entrance manhole door to the tailwater pipe wall through the lower hinge branch of the entrance manhole door and the upper hinge branch of the entrance manhole door, so as to realize the opening and closing of one side of the entrance manhole door. The two split connection structures of the lower hinge branch of the entrance manhole door and the upper hinge branch of the entrance manhole door are adopted, which can effectively solve the shortcomings of the original door shaft rusting in a humid environment causing the door body to hang down, the switch to get stuck seriously, and the opening and closing of the tailwater pipe entrance door to be time-consuming and laborious. It is also convenient to perform maintenance and replacement of the lower hinge branch of the entrance manhole door and the upper hinge branch of the entrance manhole door separately in the later inspection and maintenance work, without affecting the opening and closing state of the tailwater pipe entrance door.

[0045] The lower hinge branch of the manhole door and the upper hinge branch of the manhole door have the same structure and are arranged in parallel in upper and lower layers. The lower hinge branch of the manhole door and the upper hinge branch of the manhole door have the same structure. The first connecting piece is connected to the manhole door, and can be connected by welding, bolting or other methods. It can also be designed as an integrated structure with the manhole door and is used to be connected to the first support seat of the tailwater pipe wall through the first hinge axis. The specific structure of the first connecting piece is designed to cooperate with the first support seat. The connecting component uses a hinge axis to facilitate the connection between the first connecting piece and the first support seat of the tailwater pipe wall, which is convenient for installation and disassembly, thereby improving maintenance efficiency.

[0046] The present invention adopts a two-stage door shaft structure, which is stable, space-saving, and easy to disassemble. The two-stage door shaft is strong enough to support the manhole door, and fits with the embedded components for easy installation. The detachable hinge structure can reduce the problem of excessive lateral force on the door shaft caused by deformation of the sealing gasket when the tailwater door is tightened, which affects the sealing effect.

[0047] In order to facilitate the closing of the manhole door, a one-way thrust bearing is arranged on the first hinge shaft 201 and the second hinge shaft 301. The manhole door can be easily closed by using a smaller thrust. Preferably, the one-way thrust bearing is a rolling bearing with a small friction area, which is not easy to generate radial force, effectively reduces friction, and is easy to use.

[0048] See also Figure 1 In the embodiment of the present invention, the first connecting member 202 is connected to the first hinge shaft 201 through the first set screw group 203; the second connecting member 302 is connected to the second hinge shaft 301 through the second set screw group 303. O-rings are provided between the first connecting member 202 and the first hinge shaft 201, and between the second connecting member 302 and the second hinge shaft 301.

[0049] The first connecting member and the first hinge shaft are fixed by the first set screw group when connected to prevent the first connecting member and the first hinge shaft from falling off. An O-ring is arranged between the first connecting member and the first hinge shaft to ensure a stable connection between the first connecting member and the first hinge shaft and prevent them from falling off. The first set screw group 203 includes a first fixing bolt 231 and a first adjusting bolt 232. The first fixing bolt 231 is used to connect the first connecting member 202 to the first hinge shaft 201, and the first adjusting bolt 232 is used to adjust the position of the first connecting member 202;

[0050] The second set screw group 303 includes a second fixing bolt and a second adjusting bolt. The second fixing bolt is used to connect the second connecting member 302 to the second hinge shaft 301 , and the second adjusting bolt is used to adjust the position of the second connecting member 302 .

[0051] The first set screw group uses a fixing bolt and an adjusting bolt to realize the connection between the first connecting member and the first hinge shaft, which is convenient for the installation and adjustment of the manhole door. The position of the manhole door is fine-tuned by adjusting the bolts to accurately install the manhole door and prevent the manhole door from being misaligned when buckled. The structure of the second set screw group is the same as that of the first set screw group, and will not be repeated here.

[0052] In the embodiment of the present invention, a packing groove 101 is provided on the inner side of the manhole door 1, and a sealing packing 102 is provided in the packing groove 101. By providing the sealing packing, the sealing of the manhole door is enhanced, and at the same time, a buffering effect is played on the opening and closing of the manhole door, and the wear of the manhole door and the tailwater pipe is prevented. The packing groove is provided, and the structure is simple and easy to install and maintain. The present invention adds a packing groove on the inner side of the door, and a suitable sealing packing can be flexibly adopted according to the corrosion condition of the base.

[0053] In order to prevent the manhole door from being deformed by pressure, reinforcing ribs 103 are arranged inside the manhole door 1, and the reinforcing ribs 103 include transverse reinforcing ribs 131 and longitudinal reinforcing ribs 132. The transverse reinforcing ribs and longitudinal reinforcing ribs are staggered to improve the strength of the manhole door and prevent the manhole door from being deformed.

[0054] See also Figure 2 In order to prevent the first fixing bolt from loosening after long-term use, a first spring washer 233 and a first flat washer 234 are arranged on the first fixing bolt 231. A second spring washer 235, a second flat washer 236 and a second adjustment washer 237 are arranged on the first adjustment bolt 232. A spring washer and a flat washer are also arranged on the second fixing bolt, and a spring washer, a flat washer and an adjustment washer are also arranged on the second adjustment bolt. During installation, the packing can be placed first to evenly tighten the door body, and then the upper and lower hinges can be fixed to the door body, and then the upper and lower door shafts can be respectively inserted to connect the concrete embedded hinges, and the level and height can be adjusted by the washers, and finally the bolts can be tightened.

[0055] The present invention provides a door handle 104 on the manhole door 1 to facilitate opening and closing of the manhole door. The manhole door 1 is made of stainless steel. The 304 stainless steel material is relatively light in weight. Due to its high content of chromium and nickel, it has good corrosion resistance, a density of 7.93g / cm2, a small overall weight, excellent mechanical properties, a tensile strength of ≥520MPa at room temperature, and high strength.

[0056] The present invention provides a first fixing bolt group and a second fixing bolt group to ensure that when the tailwater pipe inlet door is closed, the door body bolts can be tightened first to uniformly pressurize the sealing ring, and then the upper and lower door hinges can be installed, thereby avoiding the phenomenon of door shaft being blocked.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Segmented axial tailwater pipe entrance door, characterized by: include: Manhole door, lower hinged branch of manhole door, upper hinged branch of manhole door; The lower hinge branch of the manhole door and the upper hinge branch of the manhole door are arranged on the same side of the manhole door and connected to the tailwater pipe wall; The lower hinge of the manhole door includes a first hinge shaft and a first connecting member, and the upper hinge of the manhole door includes a second hinge shaft and a second connecting member; The first connecting member is connected to a first supporting seat of the tailwater pipe wall via a first hinge shaft, and the second connecting member is connected to a second supporting seat of the tailwater pipe wall via a second hinge shaft.

2. The segmented axial tailwater pipe entry door according to claim 1 is characterized in that: One-way thrust bearings are arranged on the first hinge shaft and the second hinge shaft, and the one-way thrust bearings are rolling bearings.

3. The segmented axial tailwater pipe entry door according to claim 1 is characterized in that: The first connecting member is connected to the first hinge shaft via a first set screw group; the second connecting member is connected to the second hinge shaft via a second set screw group.

4. The segmented axial tailwater pipe entry door according to claim 3 is characterized in that: The first set screw assembly includes a first fixing bolt and a first adjusting bolt, the first fixing bolt is used to connect the first connecting member to the first hinge shaft, and the first adjusting bolt is used to adjust the position of the first connecting member; The second set screw group includes a second fixing bolt and a second adjusting bolt, the second fixing bolt is used to connect the second connecting member to the second hinge shaft, and the second adjusting bolt is used to adjust the position of the second connecting member.

5. The segmented axial tailwater pipe access door according to claim 4 is characterized in that: A first spring washer and a first flat washer are arranged on the first fixing bolt, and further, a second spring washer, a second flat washer and a second adjusting washer are arranged on the second adjusting bolt.

6. The segmented axial draft tube access door according to claim 1, characterized in that: O-rings are provided between the first connecting member and the first hinge shaft, and between the second connecting member and the second hinge shaft.

7. The segmented axial draft tube access door according to claim 1, characterized in that: A packing groove is arranged on the inner side of the manhole door, and a sealing packing is arranged in the packing groove.

8. The segmented axial tailwater pipe access door according to claim 1, characterized in that: Reinforcement ribs are arranged inside the manhole door, and the reinforcement ribs include transverse reinforcement ribs and longitudinal reinforcement ribs.

9. The segmented axial draft tube access door according to claim 1, characterized in that: A door handle is arranged on the manhole door.

10. The segmented axial draft tube access door according to claim 1, characterized in that: The manhole door is made of stainless steel.

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