Large ball valve expansion joint water collecting device

Abstract

The application provides a large ball valve expansion joint water collecting device, which is characterized in that an outer sleeve of the ball valve expansion joint is provided with a water collecting groove, the water collecting groove comprises an upper shell and a lower shell, the upper shell and the lower shell are connected and fixed through a flange combination surface to form an annular water collecting groove, and a sealing ring is arranged between the upper shell, the lower shell and the outer wall of the pipeline before and after the expansion joint; a water collecting cavity is formed between the water collecting groove and the outer wall of the ball valve expansion joint, a water blocking ring concentric with the ball valve expansion joint is arranged in the water collecting cavity, a blocking layer is arranged on the top of the water blocking ring, the water blocking ring is arranged outside the horizontal water leakage point of the ball valve expansion joint, the lower shell is connected with a drain pipe, and the leaked water is discharged into a drainage ditch through the drain pipe. The large ball valve expansion joint water collecting device has the advantages of simplicity, lightness, convenience in installation and disassembly, ability to resist instantaneous large water pressure leakage and reduce water pressure, meeting the needs of collecting and draining daily small amount of leakage water, and the drainage opening is convenient for observation and judgment of the development trend of water leakage.

Description

Technical Field

[0001] This invention belongs to the technical field of preventing water leakage in ball valve expansion joints, and specifically relates to a water collection device for large ball valve expansion joints. Background Technology

[0002] The structure of the expansion joint of the main inlet ball valve of the pumped storage power station unit is shown in the attached figure. Figure 1 As shown, the expansion joint consists of three sealing support rings, one U-shaped seal, and two O-shaped seals, and is secured by 24 M32 bolts. The expansion joint's function is to address the problem of ball valve displacement caused by changes in temperature and water thrust, and also to facilitate the inspection and disassembly of the ball valve and its downstream working seals.

[0003] The O-ring seal of the expansion joint is a static seal, preventing water leakage vertically along the gap of the sealing support ring. The U-ring seal is a dynamic seal, preventing water leakage horizontally along the downstream extension of the ball valve. When the ball valve is closed, the water pressure inside the volute is 1.0 MPa. After the ball valve is opened, the water pressure inside the volute is 6.4 MPa. Due to the change in volute pressure, the pressure inside the U-ring seal's sealing cavity changes, causing the U-ring seal's elastic deformation to change, thus stopping the water flow. However, before the ball valve opens, a bypass valve may be opened or the working seal may be disengaged to pressurize the volute horizontally. The volute pressure instantaneously rises from 1.0 MPa to 5.5 MPa. Because the elastic deformation time of the U-ring seal lags behind the time of the water pressure rise, a pressurized water flow will spray out horizontally from the U-ring seal, causing water leakage in the expansion joint. This leakage is characterized by its short duration, high water pressure, and large instantaneous flow rate.

[0004] In addition, during daily operation, a small amount of water leakage is inevitable, flowing out along the downstream extension of the ball valve and the volute wall, resulting in a persistent dripping of water below the ball valve and causing water accumulation on the ground. Water leakage in the expansion joint affects the automation components around the ball valve body and below the expansion joint, potentially causing short circuits or grounding. Simultaneously, the leakage leads to water accumulation on the ground, increasing the risk of slipping and falling. Long-term seepage can also pollute the ground, creating water stains. Summary of the Invention

[0005] To address the problem of instantaneous horizontal water leakage at the U-shaped seal of expansion joints, characterized by short leakage time, high water pressure, and large instantaneous flow rate, this invention provides a large ball valve expansion joint water collection device that is easy to install and disassemble and can reduce the instantaneous water pressure at the U-shaped seal.

[0006] The solution adopted by this invention to solve its technical problem is: a water collection device for a large ball valve expansion joint, wherein a water collection trough is fitted around the outer ring of the ball valve expansion joint, the water collection trough includes an upper shell and a lower shell, the upper and lower shells are connected and fixed together by a flange assembly to form an annular water collection trough, and a sealing ring is provided between the upper and lower shells and the outer walls of the pipes before and after the expansion joint; a water collection cavity is formed between the water collection trough and the outer wall of the ball valve expansion joint, and a water-blocking ring concentric with the ball valve expansion joint is provided in the water collection cavity, the top of the water-blocking ring is provided with a blocking layer, the water-blocking ring is located outside the horizontal leakage point of the ball valve expansion joint, and at least two drain outlets are provided on the lower shell, the two drain outlets are respectively located on both sides of the water-blocking ring, and a drain pipe is connected to the outside of the drain outlets to discharge the leaked water into the drainage channel through the drain pipe.

[0007] Furthermore, the barrier layer is a brush structure composed of multiple hard bristles.

[0008] Furthermore, the top of the water-blocking ring is provided with a barrier layer composed of rubber sheets, which are uniformly fixed on the top of the water-blocking ring, with the positions of the multiple rubber sheets being staggered.

[0009] Furthermore, the upper and lower shells are made of aluminum, and an anti-oxidation layer is provided on the surface of the aluminum shells.

[0010] Furthermore, the height of the water-blocking ring and the barrier layer is greater than the depth of the water collection cavity, and the top of the barrier layer is attached to the outer wall of the pipe.

[0011] Furthermore, the upper and lower housings are hinged on one side and a flange assembly surface is provided on the other side.

[0012] The beneficial effects of the present invention are as follows: The large ball valve expansion joint water collection device provided by the present invention is simple and lightweight, easy to install and disassemble, capable of resisting and reducing water pressure leakage during sudden high water pressure, meeting the daily needs for collection and drainage of small amounts of seepage water, and the drain outlet is easy to observe, making it easy to judge the development trend of leakage.

[0013] Because the contact surfaces between the water collection tank and the volute and the downstream extension of the ball valve are non-sealing surfaces, pressurized water leakage cannot be blocked by an O-ring seal. Therefore, this invention sets a water-retaining ring in the water collection cavity, with a rigid multi-layered barrier layer on top of the water-retaining ring to eliminate the water pressure of the leaking water, so that all the leakage water from the expansion joint becomes pressureless water, thereby enabling the O-ring seal to function. Simultaneously, the water collection tank is divided into upper and lower sections, with a flange assembly structure, made of aluminum, lightweight, and easy to install and disassemble. The drainage channel is located at the bottom and directs water to an open channel, facilitating observation of changes in the leakage rate of the expansion joint. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2This is a three-dimensional structural diagram of the water collection device.

[0016] Figure 3 This is a top view of the lower shell structure.

[0017] Figure 4 This is a side view structural diagram of another embodiment of the present invention.

[0018] Numbering in the diagram: 1. Downstream extension of ball valve; 2. Volute; 3. U-shaped seal of expansion joint; 4. O-shaped seal of expansion joint; 51. Upper housing; 52. Lower housing; 53. Flange assembly face; 501. Water collection chamber; 502. Water retaining ring; 503. Drain pipe; 504. Barrier layer; 505. Sealing ring; 506. Ring groove; 507. Drain outlet. Implementation

[0019] Example 1: As Figure 1 As shown, the expansion joint consists of a sealing support ring, an expansion joint U-shaped seal 3, and an expansion joint O-shaped seal 4, and is fixed by M32 bolts. It is used to connect the ball valve volute 2 and the downstream extension section 1 of the ball valve. Before the ball valve opens, the bypass valve is opened or the working seal is removed to pressurize the volute 2 horizontally. The pressure inside the volute 2 increases instantaneously from 1.0 MPa to 5.5 MPa. Because the elastic deformation time of the U-shaped seal lags behind the time of water pressure rise, a stream of pressurized water will spray out horizontally from the U-shaped seal, causing leakage in the expansion joint.

[0020] Based on the above leakage analysis, instantaneous leakage is horizontal and characterized by short duration, high water pressure, and large instantaneous flow rate, while long-term leakage seeps along the pipe wall and is characterized by small water volume but long duration. Furthermore, the large diameter (2000mm) of the volute 2 necessitates easy disassembly and installation later; the downstream extension section 1 of the ball valve and the pipe wall of the volute 2 are not sealing surfaces, and the contact surfaces are not planar, meaning a single O-ring seal cannot effectively block the instantaneously ejected high-pressure water.

[0021] Therefore, in order to reduce the impact of water leakage, the present invention provides a method such as... Figure 1-3 The large ball valve expansion joint water collection device shown can prevent water leakage from the ball valve expansion joint and collect the leaked water for treatment or discharge.

[0022] Specifically, the device includes a ball valve expansion joint and a water collection tank. The water collection tank consists of an upper housing 51 and a lower housing 52, which are connected together by a flange assembly face 53 to form an annular water collection tank. A water collection cavity 501 is formed between the water collection tank and the outer wall of the ball valve expansion joint.

[0023] In the water collection chamber 501, a water-retaining ring 502 concentric with the ball valve expansion joint is provided. The water-retaining ring 502 is used to block and limit instantaneous high-pressure jet leakage. A blocking layer 504 is provided on the top of this water-retaining ring 502 to eliminate the water pressure of the high-pressure leakage, turning the leakage of the expansion joint (instantaneous high-pressure seepage and long-term slow seepage) into pressureless seepage. At this time, although the contact surfaces of the water collection tank, the downstream extension section 1 of the ball valve, and the volute 2 are not sealed surfaces, the compression of the sealing ring 505 can still play a role in stopping water leakage and preventing external seepage. The water-retaining ring 502 is placed outside the horizontal leakage point of the ball valve expansion joint to effectively collect the leakage.

[0024] The barrier layer 504 is composed of a rigid multi-layered brush (similar to a brush structure) and is used to eliminate water pressure.

[0025] The bottom of the lower housing 52 is provided with a drain outlet 507. Since the water baffle ring 502 divides the water collection chamber 501 into two parts, drain outlets 507 are provided on both sides of the water baffle ring 502. The drain outlets 507 are connected to the outside of the drain pipes 503. The two drain pipes 503 are interconnected and connected to the drainage channel, which facilitates inspection and observation of leakage and judgment of whether the leakage of the expansion joint is increasing.

[0026] This water collection tank is designed with two parts, upper and lower, made of aluminum, making it lightweight. The upper and lower ends are joined by flanges and secured with eight M8 bolts. The drain pipe 503 connects to an open drainage channel for easy observation of leakage. The water-blocking part of the water-blocking ring inside the water collection tank consists of a rigid multi-layered barrier layer 504 (similar to a brush structure) to eliminate the water pressure of the jetting leakage. The sealing ring 505 is designed to prevent water from seeping along the pipe wall. Ultimately, all leakage water from the expansion joint flows into the water collection tank and is discharged through the drain pipe 503.

[0027] An annular groove 506 is provided on the side of the water collection device that contacts the outer wall of the pipe. The sealing ring 505 is fitted in the annular groove 506, and the position of the sealing ring 505 is restricted by the annular groove 506.

[0028] With this design, when water leaks from the ball valve expansion joint, the leaking water is intercepted by the water-blocking ring 502 and flows into the water collection chamber 501. The water collection chamber 501 can collect the leaking water and treat or discharge it through other devices, thereby avoiding pollution and damage to the surrounding environment caused by the leaking water.

[0029] The advantages of this large ball valve expansion joint water collection device are its simplicity and practicality; it can effectively collect and treat leaks, protecting the environment and ensuring the safe operation of equipment.

[0030] Example 2: Furthermore, the barrier layer 504 can be made of multiple layers of rigid baffles, such as... Figure 2 and Figure 3As shown, a barrier layer 504 composed of rubber sheets is provided on the top of the water-blocking ring 502. The rubber sheets are uniformly fixed on the top of the water-blocking ring 502, and the positions of the multiple layers of rubber sheets are staggered. That is, the second layer of rubber sheets corresponds to the gap of the first layer of rubber sheets, and the third layer of rubber sheets corresponds to the gap of the second layer, forming a staggered multi-layer structure. After the horizontally sprayed water is sprayed outward, it is reduced by the layers of rubber sheets to form a pressureless leakage, so that the water can be completely collected in the water collection cavity 501, and then discharged into the drainage ditch through the drain pipe 503.

[0031] like Figure 4 As shown, to facilitate the carrying and installation of the water collection device, one side of the upper housing 51 and the lower housing 52 are hinged together, and the other side is provided with a flange assembly surface 53. The hinge connects the upper housing 51 and the lower housing 52 for easy carrying. In use, the upper housing 51 and the lower housing 52 are separated by flipping the hinge, and then fastened to the pipes before and after the expansion joint. The flange assembly surface on the other side is fixed by bolts, thereby encircling the outside of the expansion joint.

[0032] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the present invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A water collection device for a large ball valve expansion joint, characterized in that, A water collection trough is fitted around the outer ring of the ball valve expansion joint. The water collection trough includes an upper shell (51) and a lower shell (52). The upper and lower shells (52) are connected and fixed together by a flange assembly (53) to form an annular water collection trough. A sealing ring (505) is provided between the upper and lower shells (52) and the outer walls of the pipes before and after the expansion joint. A water collection cavity (501) is formed between the water collection trough and the outer wall of the ball valve expansion joint. A water-blocking ring (502) concentric with the ball valve expansion joint is provided in the water collection cavity (501). A blocking layer (504) is provided on the top of the water-blocking ring (502). The water-blocking ring (502) is located outside the horizontal leakage point of the ball valve expansion joint. At least two drain ports (507) are provided on the lower shell (52). Two drain outlets (507) are located on both sides of the water-blocking ring (502). The drain outlets (507) are connected to the drain pipe (503) on the outside. The top of the water-blocking ring (502) is provided with a barrier layer (504) composed of rubber sheets. The rubber sheets are uniformly fixed on the top of the water-blocking ring (502). The positions of the multiple rubber sheets are staggered. The second layer of rubber sheets corresponds to the gap of the first layer of rubber sheets, and the third layer of rubber sheets corresponds to the gap of the second layer, forming a staggered multi-layer structure. After the horizontally sprayed water is sprayed outward, it is reduced by the multiple layers of rubber sheets to form a pressureless leakage, so that the water can be completely collected in the water collection cavity (501) and then discharged into the drainage channel through the drain pipe (503).

2. The large ball valve expansion joint water collection device according to claim 1, characterized in that, The barrier layer (504) is a brush structure composed of multiple hard brush layers.

3. The large ball valve expansion joint water collection device according to claim 1, characterized in that, The upper shell (51) and lower shell (52) are made of aluminum, and an anti-oxidation layer is provided on the surface of the aluminum shell.

4. The large ball valve expansion joint water collection device according to claim 1, characterized in that, The height of the water-blocking ring (502) and the barrier layer (504) is greater than the depth of the water collection cavity (501), and the top of the barrier layer (504) is attached to the outer wall of the pipe.

5. The large ball valve expansion joint water collection device according to claim 1, characterized in that, The upper housing (51) and the lower housing (52) are hinged on one side and a flange assembly surface (53) is provided on the other side.

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