CN203463831U - Telescopic joint anti-leaking device of water pumping energy-accumulating unit ball valve - Google Patents

Abstract

The utility model discloses an anti-leakage device for a ball valve telescopic joint of a pumped energy storage unit. A horizontal U-shaped sealing ring is arranged in the telescopic joint downstream of the ball valve, and a combined O-shaped sealing ring is installed at the position of the opening groove of the horizontal U-shaped sealing ring. , the combined O-ring is separated into at least two sections, which are connected by instant adhesive, and the thickness of the instant glue is smaller than the diameter of the combined O-ring. The utility model can eliminate the problem that the horizontal U-shaped sealing ring cannot be tightly sealed due to the deformation caused by the weight of the expansion joint itself. The existence of the O-ring seal can also be tightly sealed with the equipment without gaps. The combined O-shaped sealing ring is affected by the internal water pressure of the pipeline, and the water medium can also enter the opening groove of the horizontal U-shaped sealing ring to expand the opening groove of the horizontal U-shaped sealing ring to play a role of sealing and water stop .

Description

Anti-leakage device for ball valve expansion joint of pumped storage unit

technical field

The utility model belongs to the technical field of pumped energy storage, in particular to a leakage prevention device for a ball valve expansion joint of a pumped energy storage unit.

Background technique

Most of the pumped storage power stations are underground powerhouse structures, equipped with rated water head and rated power turbine working conditions, using water medium to pass through diversion tunnels, pressure steel pipes, ball valves, expansion joints downstream of ball valves, volutes, runners, draft pipes, etc. The circulation between the reservoir and the lower reservoir realizes the functions of power generation and water pumping. Therefore, in the entire water diversion channel system, the sealing of the water medium plays a vital role. If there is a large amount of water leakage in any point of equipment, it will cause water to flood the underground powerhouse, causing very serious consequences. Among them, the ball valve and the ball valve expansion joint play the role of cutting off the water flow and sealing the pipeline during the unit process, and when the unit fails, the ball valve can be closed by dynamic water, cutting off the water flow of the pressure steel pipe, and playing an important role in protecting the safety of personnel and equipment. The multiple seals inside the downstream expansion joint play a very important role in preventing water leakage from the penstock and the volute.

The internal seal of the expansion joint downstream of the traditional ball valve includes two φ10mm O-rings and one φ2180mm horizontal U-ring. The horizontal U-shaped sealing ring installed in traditional equipment is a simple sealing strip similar to the letter "U", made of nitrile rubber or other materials, and various sealing products are derived according to the different opening angles of the horizontal U-shaped sealing ring. structure, and has good flexibility. According to the actual situation on site, due to the characteristics of high water head and high pressure of the equipment, the traditional horizontal U-shaped sealing ring installed behind the expansion joint of the ball valve cannot be sealed tightly and a large amount of water leakage occurs.

After analyzing the working condition of the expansion joint and the structure of the original horizontal U-shaped sealing ring, it is found that when the traditional horizontal U-shaped sealing ring of the expansion joint of the ball valve is expanded outward by the internal water pressure of the pipeline, it is also compressed by the gravity of the active ring of the expansion joint. As a result, the position of the horizontal U-shaped sealing ring at the top of the circumference is more obviously affected by gravity, and the amount of deformation is relatively large, while the position at the bottom of the circumference is less affected by gravity, and the amount of deformation is small. Due to the different deformation of the horizontal U-shaped sealing ring, when the U-shaped mouth of the horizontal U-shaped sealing ring is opened, its expansion angle and size also change accordingly, and it cannot be fully opened or deformed, resulting in a large amount of water leakage, which cannot meet the requirements. Unit water pressure requirements. After a variety of on-site maintenance measures, such as replacing the ball valve expansion joint seal, readjusting the clearance fit of the movable ring, increasing the compression torque of the bolts, and applying sealant, there was no obvious improvement.

Utility model content

The purpose of this utility model is to provide a leak-proof device suitable for the expansion joint downstream of the ball valve of the pumped storage unit, which can make up for the disadvantages of the horizontal U-shaped sealing ring.

The solution of the utility model: a leak-proof device for the expansion joint of the ball valve of the pumped storage unit, which is located at the position of the expansion joint downstream of the ball valve where the pipe flange and the transition pipe are connected. The second ring and the movable ring 1 are fixed by bolts; an O-ring is provided between the pipe flange and the movable ring 3, and an O-ring is provided between the movable ring 3 and the movable ring 2; the transition pipe is located at The inner side of the movable ring 2 and the movable ring 1 is matched with the movable ring 3. A horizontal U-shaped sealing ring is arranged between the movable ring 2 and the movable ring 1, and a combined O-shaped sealing ring is installed at the position of the opening groove of the horizontal U-shaped sealing ring. As for the sealing ring, the combined O-ring is separated into at least two sections, which are connected by instant adhesive, and the thickness of the instant adhesive is smaller than the diameter of the combined O-ring.

The combination O-shaped sealing ring is set in the opening groove of the horizontal U-shaped sealing ring. Alternatively, the combined O-ring is located at the notch of the open groove of the horizontal U-shaped sealing ring, and the diameter of the combined O-shaped sealing ring is greater than the width of the open groove of the lying U-shaped sealing ring.

The composite O-ring is composed of four arc-shaped sealing rings. The diameter of the composite O-ring is 6mm, and there is a clearance fit between adjacent arc-shaped sealing rings. The gap width is 10mm.

The transition pipe is a tapered pipe, and a wedge-shaped compression ring is set on the outside of the port. The wedge-shaped compression ring is located on the inner side of the second movable ring and the first movable ring, and is in clearance fit with the third movable ring.

The beneficial effects of the utility model:

1. Adding a φ6mm combined O-ring in the opening groove of the horizontal U-shaped sealing ring can eliminate the problem that the horizontal U-shaped sealing ring cannot be sealed tightly due to deformation caused by the expansion joint’s own weight, even if the horizontal U-shaped sealing ring has deformation , so that the mouth of the horizontal U-shaped sealing ring cannot be tightly sealed with the equipment, but due to the existence of the combined O-shaped sealing ring, it can also be tightly sealed with the equipment without gaps.

2. The newly added combination O-ring is divided into four sections, and each section is separated by 10mm. After the installation is in place, the water medium can also enter the horizontal U-shaped seal through the 10mm interval of the combined O-ring under the action of the internal water pressure of the pipeline. In the opening groove of the horizontal U-shaped sealing ring, expand the opening groove of the horizontal U-shaped sealing ring to play the role of sealing and water stop.

Description of drawings

Figure 1 is a general view of the ball valve and the downstream expansion joint;

Fig. 2 is a diagram of the parts of the expansion joint of the ball valve;

Fig. 3 is a partial enlarged structural schematic diagram of Fig. 2;

Figure 4 is one of the assembly diagrams of the horizontal U-shaped sealing ring and the combined O-shaped sealing ring;

Fig. 5 is the second schematic diagram of the assembly of the horizontal U-shaped sealing ring and the combined O-shaped sealing ring.

In the figure, the number 1 is the ball valve, 2 is the expansion joint downstream of the ball valve, 201 is the flange, 202 is the first movable ring, 203 is the second movable ring, 204 is the third movable ring, 205 is the nut, 206 is the bolt, and 207 is the transition pipe , 208 is a wedge-shaped compression ring, 3 is a pipe flange, 4 is a horizontal U-shaped sealing ring, 5 is a combined O-shaped sealing ring, and 6 and 7 are O-shaped sealing rings.

Detailed ways

Embodiment 1: An anti-leakage device for ball valve expansion joints of pumped storage units, as shown in Figure 1, is an improvement made for the expansion joints downstream of the ball valve 1. The downstream expansion joints 2 of the ball valve are connected by the pipe flange 3 and the transition pipe 207 Set the sealing structure. It can be seen from Fig. 2 and Fig. 3 that the movable ring 3 204, the movable ring 2 203 and the movable ring 1 202 are connected with the pipe flange 3 sequentially. A nut 205 is installed. Furthermore, an O-ring 8 is provided between the pipe flange 3 and the third movable ring 204 , and an O-ring 7 is provided between the third movable ring 204 and the second movable ring 203 . In FIG. 2 and FIG. 3 , the transition pipe 207 is located inside the second movable ring 203 and the first movable ring 202 and is in clearance fit with the third movable ring 204 . The transition pipe 207 is a tapered pipe, and a wedge-shaped compression ring 208 is set on the outside of its port. The wedge-shaped compression ring 208 is located on the inner side of the movable ring 2 203 and the movable ring 1 202 , and is in clearance fit with the movable ring 3 204 . There is a gap d between the wedge-shaped pressing ring 208 and the second movable ring 203 and the first movable ring 202 .

A horizontal U-shaped sealing ring 4 is arranged between the movable ring 2 203 and the movable ring 1 202, and a combined O-shaped sealing ring 5 is installed at the position of the opening groove of the horizontal U-shaped sealing ring 4, and the combined O-shaped sealing ring 5 is Separated into four equal arc-shaped sealing rings, the diameter of the combined O-shaped sealing ring 5 is 6mm, the gap width between adjacent arc-shaped sealing rings is 10mm, and the arc-shaped sealing rings are connected by instant adhesive to prevent fall off. The thickness of the instant adhesive is smaller than the diameter of the combined O-ring. Thereby, water pressure can be made to act on the horizontal U-shaped sealing ring 4 . The installation relationship between the horizontal U-shaped sealing ring 4 and the combined O-shaped sealing ring 5 can be referred to in Figure 4. The combined O-shaped sealing ring 5 is set inside the opening groove of the horizontal U-shaped sealing ring 4, and the opening groove of the horizontal U-shaped sealing ring 4 Expand to play the role of sealing and water stop. After the installation test, this new type of sealing structure, when the upper end of the horizontal U-shaped sealing ring 4 is deformed, the combined O-shaped sealing ring 5 can enter the open groove of the horizontal U-shaped sealing ring 4 under the action of water pressure, Thereby the horizontal U-shaped sealing ring 4 is opened, which fully satisfies the operation needs of the equipment, and the water leakage phenomenon disappears, saves a large amount of material resources and financial resources for maintenance, and improves the operation stability of the equipment.

Embodiment 2: Referring to Fig. 5, the content is basically the same as that of Embodiment 1, and the similarities will not be repeated. The difference is that the combined O-shaped seal ring 5 is located at the notch of the open groove of the horizontal U-shaped seal ring 4, and the combined O-shaped seal ring The diameter of type seal ring 5 is greater than the width of horizontal U-type seal ring 4 open grooves. Under the action of water pressure, the combination O-shaped sealing ring 5 will be pressed into the opening groove of the horizontal U-shaped sealing ring 4, so as to keep the horizontal U-shaped sealing ring 4 from deformation. Thereby, the problem that the horizontal U-shaped sealing ring 4 cannot be sealed tightly due to the deformation caused by the weight of the expansion joint itself can be eliminated. Even if the horizontal U-shaped sealing ring 4 has deformation, the opening groove of the horizontal U-shaped sealing ring 4 cannot be tightly sealed with the equipment. However, due to the existence of the combined O-ring 5, it can also be tightly sealed with the equipment without gaps.

Claims (6)

1. An anti-leakage device for the expansion joint of the ball valve of the pumped storage unit, which is located at the position of the expansion joint downstream of the ball valve where the pipe flange and the transition pipe are connected, and is characterized in that: there are three movable rings that are sequentially fitted and connected with the pipe flange. The second ring and the movable ring 1 are fixed by bolts; an O-ring is provided between the pipe flange and the movable ring 3, and an O-ring is provided between the movable ring 3 and the movable ring 2; the transition pipe is located at The inner side of the movable ring 2 and the movable ring 1 is matched with the movable ring 3. A horizontal U-shaped sealing ring is arranged between the movable ring 2 and the movable ring 1, and a combined O-shaped sealing ring is installed at the position of the opening groove of the horizontal U-shaped sealing ring. sealing ring. 2. The anti-leakage device for ball valve expansion joints of pumped storage units according to claim 1, characterized in that: the combined O-ring is at least separated into two sections, which are connected by instant adhesive, and the thickness of the instant adhesive is Smaller than the diameter of the combined O-ring. 3. The anti-leakage device of the ball valve expansion joint of the pumped storage unit according to claim 1, characterized in that: the combined O-shaped sealing ring is set inside the opening groove of the horizontal U-shaped sealing ring. 4. The anti-leakage device for ball valve expansion joints of pumped storage units according to claim 1, characterized in that: the combined O-ring is located at the notch of the opening groove of the horizontal U-shaped sealing ring, and the diameter of the combined O-ring is It is larger than the width of the opening groove of the horizontal U-shaped sealing ring. 5. The anti-leakage device for ball valve telescopic joints of pumped storage units according to claim 1, characterized in that: the combined O-ring is a combined structure of four arc-shaped sealing rings, and the diameter of the combined O-ring is 6 mm. There is a gap fit between adjacent arc-shaped sealing rings, and the gap width is 10mm. 6. The anti-leakage device for ball valve expansion joints of pumped storage units according to claim 1, characterized in that: the transition pipe is a tapered pipe, and a wedge-shaped compression ring is set on the outside of the port, and the wedge-shaped compression ring is located at The inner side of the second movable ring and the first movable ring is matched with the third movable ring.

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