CN-224228776-U - Water pump hydroturbine spiral case seat ring tensioning screw rod protective sleeve

CN224228776UCN 224228776 UCN224228776 UCN 224228776UCN-224228776-U

Abstract

The utility model discloses a water pump water turbine volute seat ring tensioning screw rod protective sleeve, which relates to the technical field of hydraulic generators and comprises a fixed pipe, a fixed sleeve and a fixed plate arranged at the bottom of concrete, wherein one end of the fixed plate is provided with a groove for positioning the fixed pipe, one part of the fixed pipe is buried in the concrete and is fixedly connected with the fixed plate, the other part of the fixed pipe stretches out of the concrete, one end of the fixed pipe stretches out of the concrete is fixedly provided with a joint, the outer wall of the joint is provided with a sealing groove, a sealing ring is arranged in the sealing groove, one end of the fixed sleeve is fixedly connected with the volute seat ring, the other end of the fixed sleeve is sleeved outside the joint and is in clearance fit with the joint to form a flexible connection loose joint capable of moving along the axis of the joint, the center of the fixed plate is provided with a through hole for enabling a tensioning screw rod to penetrate out of the concrete, and the distance L between adjacent sealing grooves and the section diameter D of the sealing ring meet L/D=0.05-0.12. The utility model can prevent the concrete from directly contacting with the tensioning screw, ensure the pretightening force of the tensioning screw and prevent the protective sleeve from being damaged by the stress.

Inventors

ZHANG YONG
HUANG SHIHAI
XIONG XIN
PU YONGJIAN
JIN HENG
LIU HUI
ZHANG JIAN
ZHAO YOULONG
HUANG ZHIJUN
SONG MIN
Ji Bairui
FAN JIAYI
SU DONGDONG

Assignees

雅砻江流域水电开发有限公司
东方电气集团东方电机有限公司

Dates

Publication Date: 20260512
Application Date: 20250618

Claims (10)

1. The utility model provides a water pump hydroturbine spiral case seat ring tensioning screw rod protective sheath, includes fixed pipe (1), fixed cover (5) and fixed plate (2), fixed plate (2) set up in the concrete bottom, and fixed plate (2) one end is provided with the recess that is used for fixed pipe (1) location, fixed pipe (1) a part buries in the concrete and with fixed plate (2) fixed connection, a part stretches out the concrete, fixed pipe (1) stretches out the fixed joint (3) that is provided with of one end of concrete, joint (3) outer wall circumference is provided with a plurality of seal grooves, is provided with sealing washer (4) in the seal groove, fixed cover (5) one end and spiral case seat ring (7) fixed connection, and the other pot head is established on joint (3) and with joint (3) clearance fit form the flexible connection loose joint that can follow joint (3) axis motion, fixed plate (2) center is provided with the through-hole that is used for tensioning screw rod (6) to wear out the concrete, interval L between the adjacent seal groove and sealing washer (4) diameter D satisfy L/D=0.05-0.05-0.0.
2. The water pump turbine volute seat ring tensioning screw protection sleeve of claim 1, wherein the fixing plate (2) is provided with radially distributed anchoring ribs (10).
3. The water pump turbine volute seat ring tensioning screw protection sleeve according to claim 1 or 2, wherein the sealing ring (4) is an O-shaped sealing ring (4).
4. The water pump turbine volute seat ring tensioning screw protection sleeve of claim 3, wherein two sealing grooves are formed.
5. The water pump turbine volute seat ring tensioning screw protection sleeve of claim 4, wherein the sleeve joint ends of the fixing sleeve (5) and the joint (3) are respectively provided with a chamfer angle of 30-60 degrees, and the chamfer width is 5-8mm.
6. The water pump turbine volute seat ring tensioning screw protection sleeve of claim 5, wherein a wear-resistant coating is arranged on the inner wall of the fixing sleeve (5).
7. The water pump turbine volute seat ring tensioning screw protection sleeve according to claim 1, wherein the fixing pipe (1), the fixing sleeve (5) and the fixing plate (2) are coaxially arranged.
8. The water pump turbine volute seat ring tensioning screw protection sleeve of claim 1, wherein the connector (3) is fixed on the fixed pipe (1) in a welding mode or fixed on the fixed pipe (1) through threads.
9. The water pump turbine volute seat ring tensioning screw protection sleeve according to claim 1, wherein the fixing sleeve (5) is fixedly welded with the seat ring (7) or fixedly connected with the seat ring through a flange.
10. The water pump hydroturbine volute casing ring tensioning screw protection sleeve of claim 1, wherein the fixing pipe (1) is welded with the fixing plate (2) or fixedly connected through a flange.

Description

Water pump hydroturbine spiral case seat ring tensioning screw rod protective sleeve Technical Field The utility model relates to the technical field of hydraulic generators, in particular to a water pump hydraulic turbine volute casing ring tensioning screw protection sleeve. Background In the running process of the hydroelectric generating set, the volute seat ring is used as a basis of a water turbine, is a key supporting component and a key pressure-bearing flow guiding component, directly bears the weight of components such as a top cover, a water guiding mechanism, a bearing and the like, axial water thrust transmitted by the top cover and the like, transmits the water thrust to surrounding concrete, and is of great importance to the safe and stable running of the set. The tensioning screw on the spiral case seat ring of the hydraulic turbine is an important component part of the unit, the tensioning screw tightens and fixes the spiral case seat ring through pretightening force and plays a supporting role in the spiral case seat ring, so that the weight and the water thrust of other components are shared and transferred, the spiral case seat ring is prevented from floating or rotating during concrete pouring, and the stability of the spiral case seat ring is ensured. When the volute casing seat ring concrete is poured, the protection sleeve is needed to separate the concrete from the tensioning screw rod, so that the tensioning screw rod is prevented from being contacted with the concrete. The tension screw is a key component for connecting and fixing the volute seat ring, and the design of the tension screw generally considers the factors such as material strength, pretightening force and the like to ensure the stability and safety of the tension screw. However, when the tightening screw is directly contacted with the concrete, because the property difference between the concrete and the metal material is large, when the tightening screw directly acts on the concrete, large local pressure is generated at the contact point, and the stress concentration phenomenon can be generated at the contact surface, and the stress concentration can cause the local stress of the screw to be too large, so that the damage conditions such as cracks, breakage and the like are initiated. In addition, moisture and chemical substances in the concrete can contact with the tensioning screw through capillary action or osmosis, so that electrochemical corrosion or chemical corrosion occurs on the surface of the screw, and the corrosion can weaken the rigidity and strength of the screw, and influence the normal use of the screw. At present, a power station directly adopts a long steel pipe to protect a tensioning screw, only one half section of the tensioning screw can be protected by adopting the mode, the other half section of the tensioning screw is usually required to be divided into two halves to wrap the tensioning screw for protection, and the gap position is connected by adopting welding and sealant. The Chinese patent document with publication number CN203594550U and publication date 2014, 5 month and 14 discloses a radial pull rod structure of a hydraulic generator upper frame, which comprises a cushion block, a stop washer, a nut, a tensioning screw rod and a pre-embedded foundation plate, wherein one end of the tensioning screw rod is fixed on the frame by the cushion block, the stop washer and the nut, and one end of the tensioning screw rod is fixed on the pre-embedded foundation plate by the stop washer and the nut. The utility model is mainly characterized in that the radial direction of the upper frame is tensioned by the pretightening force of the tensioning screw rod, so that the purpose of reinforcing the radial rigidity of the upper frame is achieved, the structure is simple, the cost is low, and the situation that the traditional jack supports a broken foundation when a unit is short-circuited due to the fact that the tensioning screw rod only bears the tension force can be avoided. However, according to the technical scheme, the tensioning screw directly acts on the concrete, and the contact surface may generate stress concentration phenomenon, so that damage conditions such as cracks, fracture, corrosion and the like are initiated. The Chinese patent excitation literature with publication number of CN207437261U and publication date of 2018, 6 and 1 discloses a foundation connection mechanism for a hydraulic generator of an upper rack of an inclined support arm, wherein the foundation connection mechanism is embedded into a concrete foundation along the positioning direction of the upper rack support arm, and an adjusting hole is reserved at the position of a bottom plate below a mounting plate. When the machine set is installed, the screw rod passes through the unthreaded hole on the connecting plate, the screw rod is fixedly locked by using the bolts, one end of the connecting screw rod is fixed with t