Power station valve sealing test tool

Abstract

A power station valve sealing test tool relates to the technical field of valve performance test. According to the utility model, the problems of low working efficiency, high labor and equipment cost and serious energy consumption of the existing valve sealing test mode are solved. A working medium valve bank is installed at the bottom of a supporting frame, a plurality of lower valve seats are installed at the top end of the working medium valve bank, a plurality of upper valve seats which are oppositely arranged are arranged above the lower valve seats respectively, a preliminary pressing assembly is installed at the top of the supporting frame, and the movable end of the preliminary pressing assembly is connected with the upper valve seats. A plurality of tested power station valves are respectively arranged between the plurality of upper valve seats and the plurality of lower valve seats, each upper valve seat is connected with the corresponding lower valve seat through an independent locking assembly, and an upper sealing rubber sheet and a lower sealing rubber sheet are respectively arranged between the upper end flange and the lower end flange of each tested power station valve and the corresponding upper valve seat as well as between the upper end flange and the lower end flange of each tested power station valve and the corresponding lower valve seat. According to the utility model, a plurality of valves can be simultaneously subjected to a sealing test by one device, the valve sealing test efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve performance testing technology, specifically to a power plant valve sealing test fixture. Background Technology

[0002] Power plant valves are used to cut off or connect media in pipelines of thermal power plant systems. Compared to other valve products, power plant valves are characterized by high temperature and high pressure; therefore, valve sealing testing is a crucial step in ensuring valve performance and safety. The sealing test verifies the valve's sealing performance by applying a certain pressure to observe leakage when the valve is closed. The sealing test pressure is typically 1.1 times the valve's nominal pressure. During the test, the valve is closed, and the pressure is gradually increased to the sealing test pressure and maintained at that pressure for a certain period. During the pressure holding period, the valve's sealing points are checked for leaks.

[0003] Currently, existing valve sealing test benches can only perform sealing tests on one valve at a time, resulting in low efficiency. When production tasks are heavy and batch production is required, multiple machines need to be used simultaneously to perform sealing tests on multiple valves, leading to high labor and equipment costs and significant energy consumption.

[0004] In summary, existing valve sealing test methods suffer from low efficiency, high labor and equipment costs, and significant energy consumption. Utility Model Content

[0005] The purpose of this invention is to solve the problems of low work efficiency, high labor and equipment costs, and serious energy consumption in existing valve sealing test methods, and to provide a power plant valve sealing test fixture.

[0006] The technical solution of this utility model is:

[0007] A power plant valve sealing test fixture includes a support frame 1, a working fluid valve assembly 2, a preliminary clamping assembly 3, multiple upper valve seats 4, multiple lower valve seats 5, multiple individual locking assemblies 6, multiple upper sealing rubber sheets 7, and multiple lower sealing rubber sheets 8. The working fluid valve assembly 2 is installed at the bottom of the support frame 1. Multiple lower valve seats 5 are evenly arranged from left to right at the top of the working fluid valve assembly 2. Multiple upper valve seats 4 are respectively arranged opposite to each of the multiple lower valve seats 5. The preliminary clamping assembly 3 is installed at the top of the support frame 1. The movable end of the preliminary clamping assembly 3 is connected to the multiple upper valve seats 4. Multiple power plant valves 9 to be tested are respectively arranged between the multiple upper valve seats 4 and the multiple lower valve seats 5. Each upper valve seat 4 is connected to the corresponding lower valve seat 5 by an individual locking assembly 6. Each power plant valve 9 to be tested has an upper sealing rubber sheet 7 and a lower sealing rubber sheet 8 between its upper and lower flanges and the corresponding upper valve seat 4 and lower valve seat 5, respectively.

[0008] Furthermore, the support frame 1 includes an upper frame plate 101, a lower frame plate 102 and multiple connecting columns 103. The upper frame plate 101 and the lower frame plate 102 are arranged horizontally opposite each other, and the upper frame plate 101 and the lower frame plate 102 are fixedly connected by multiple connecting columns 103 arranged vertically in an array.

[0009] Furthermore, the preliminary clamping assembly 3 includes a hydraulic cylinder 301 and a pressure plate 302. The hydraulic cylinder 301 is vertically arranged in the middle of the upper surface of the upper frame plate 101, and the pressure plate 302 is horizontally arranged below the upper frame plate 101. The piston rod end of the hydraulic cylinder 301 passes through the upper frame plate 101 and is fixedly connected to the pressure plate 302.

[0010] Furthermore, the preliminary clamping assembly 3 also includes four guide rods 303 and four metal linear bearings 304. Four guide rods 303 are arranged vertically in an array between the upper frame plate 101 and the lower frame plate 102. Four pressure plate mounting holes that match the guide rods 303 are opened on the pressure plate 302. Four metal linear bearings 304 are respectively embedded in the four pressure plate mounting holes. The pressure plate 302 slides with the four guide rods 303 through the four metal linear bearings 304.

[0011] Furthermore, the individual locking assembly 6 includes four long bolts 601 and four hexagonal nuts 602. The bottom of the upper valve seat 4 is provided with an upper valve seat flange 401, on which four upper flange holes are opened through the upper and lower surfaces of the flange body. The top of the lower valve seat 5 is provided with a lower valve seat flange 501, on which four lower flange holes are opened through the upper and lower surfaces of the flange body. The upper valve seat flange 401 and the lower valve seat flange 501 are connected and fixed by four long bolts 601 and four hexagonal nuts 602.

[0012] Furthermore, the upper flange hole is a stepped through hole, and the upper section of the stepped through hole is a hexagonal countersunk hole, which matches the hexagonal nut of the long bolt.

[0013] Furthermore, the upper valve seat flange 401 has an upper threaded groove on its flange body side that communicates with the upper flange hole, and the lower valve seat flange 501 has a lower threaded groove on its flange body side that communicates with the lower flange hole. The outer diameter of the long bolt 601 is smaller than the groove width of the upper threaded groove and the lower threaded groove.

[0014] Furthermore, the working fluid valve assembly 2 has multiple working fluid channels 201 arranged in parallel inside. The inlet and outlet of each working fluid channel 201 pass through the front and rear surfaces of the working fluid valve assembly 2, respectively. Multiple working fluid inlet pipes 202 are connected to the inlets of the multiple working fluid channels 201, and multiple working fluid inlet valves 203 are installed on the multiple working fluid inlet pipes 202.

[0015] Furthermore, the lower valve seat 5 is provided with a valve seat channel inside. The inlet and outlet of the valve seat channel pass through the upper and lower surfaces of the valve seat body, respectively. The inlet of the valve seat channel is connected to the outlet of the corresponding working fluid channel 201. A rubber through hole is opened in the center of the lower sealing rubber 8, and the outlet of the valve seat channel is connected to the corresponding rubber through hole.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This utility model discloses a vertical test bench for power plant valve sealing tests, enabling multiple valves to undergo sealing tests simultaneously on a single device. This effectively improves valve sealing test efficiency and significantly reduces test costs. The fixture employs a valve fixing method combining a preliminary clamping assembly with multiple individual locking assemblies. Initially, multiple valves are simultaneously subjected to preliminary clamping. Since the hydraulic cylinder is located in the center of the fixture, uneven force may occur. Therefore, further individual clamping of certain valves is necessary to ensure that all valves are simultaneously clamped by a single cylinder, effectively reducing equipment costs and saving energy. Attached Figure Description

[0018] Figure 1 This is the front view of the power plant valve sealing test fixture of this utility model;

[0019] Figure 2 This is a side view of the power plant valve sealing test fixture of this utility model;

[0020] Figure 3 This is a top view of the upper valve seat flange of this utility model;

[0021] Figure 4 yes Figure 3 Sectional view at AA;

[0022] Figure 5 This is a side view of the upper valve seat flange of this utility model.

[0023] In the diagram: 1. Support frame; 2. Working fluid valve assembly; 3. Preliminary clamping assembly; 4. Upper valve seat; 5. Lower valve seat; 6. Individual locking assembly; 7. Upper sealing rubber; 8. Lower sealing rubber; 9. Valve of the power station under test; 101. Upper frame plate; 102. Lower frame plate; 103. Connecting column; 201. Working fluid channel; 202. Working fluid inlet pipe; 203. Working fluid inlet valve; 301. Hydraulic cylinder; 302. Pressure plate; 303. Guide rod; 304. Metal linear bearing; 401. Upper valve seat flange; 501. Lower valve seat flange; 601. Long bolt; 602. Hex nut. Detailed Implementation

[0024] Specific implementation method one: Combining Figures 1 to 5This embodiment describes a power plant valve sealing test fixture. The test fixture includes a support frame 1, a working fluid valve assembly 2, a preliminary clamping assembly 3, multiple upper valve seats 4, multiple lower valve seats 5, multiple individual locking assemblies 6, multiple upper sealing rubber sheets 7, and multiple lower sealing rubber sheets 8. The working fluid valve assembly 2 is installed at the bottom of the support frame 1. Multiple lower valve seats 5 are evenly arranged from left to right at the top of the working fluid valve assembly 2. Multiple upper valve seats 4 are respectively arranged opposite to each other above the multiple lower valve seats 5. The preliminary clamping assembly 3 is installed at the top of the support frame 1. The movable end of the preliminary clamping assembly 3 is connected to the multiple upper valve seats 4. Multiple power plant valves 9 to be tested are respectively arranged between the multiple upper valve seats 4 and the multiple lower valve seats 5. Each upper valve seat 4 is connected to the corresponding lower valve seat 5 through an individual locking assembly 6. Each power plant valve 9 to be tested has an upper sealing rubber sheet 7 and a lower sealing rubber sheet 8 respectively between its upper and lower flanges and the corresponding upper valve seat 4 and lower valve seat 5.

[0025] Specific Implementation Method Two: Combining Figures 1 to 5 This embodiment describes a support frame 1 comprising an upper frame plate 101, a lower frame plate 102, and multiple connecting columns 103. The upper frame plate 101 and the lower frame plate 102 are arranged horizontally opposite each other, and are fixedly connected by multiple connecting columns 103 arranged vertically in an array. With this configuration, the support frame 1 provides support for the entire fixture. Both ends of the connecting columns 103 are machined with external threads. The upper frame plate 101 is machined with a frame plate connecting through hole matching the connecting column 103, and the lower frame plate 102 is machined with a frame plate connecting threaded hole matching the connecting column 103. The upper end of the connecting column 103 passes through the frame plate connecting threaded hole of the upper frame plate 101. Two locking nuts are threaded onto the upper end of the connecting column 103, with the lower locking nut abutting against the lower surface of the upper frame plate 101 and the upper locking nut abutting against the upper surface of the upper frame plate 101. The lower end of the connecting column 103 is connected to the threaded hole of the lower frame plate 102 and fixed by a lock nut. Other components and connections are the same as in Specific Embodiment 1.

[0026] Specific implementation method three: Combining Figures 1 to 5 This embodiment describes the preliminary clamping assembly 3, which includes a hydraulic cylinder 301 and a pressure plate 302. The hydraulic cylinder 301 is vertically positioned at the center of the upper surface of the upper frame plate 101, while the pressure plate 302 is horizontally positioned below the upper frame plate 101. The piston rod end of the hydraulic cylinder 301 passes through the upper frame plate 101 and is fixedly connected to the pressure plate 302. With this configuration, when the piston rod of the hydraulic cylinder 301 extends, it moves the pressure plate 302 downwards to achieve preliminary clamping of the multiple tested power station valves 9. When the piston rod of the hydraulic cylinder 301 retracts, it moves the pressure plate 302 upwards, away from the pressure plate 302. Other components and connections are the same as in specific embodiments one or two.

[0027] Specific implementation method four: Combination Figures 1 to 5 In this embodiment, the preliminary clamping assembly 3 further includes four guide rods 303 and four metal linear bearings 304. Four guide rods 303 are arranged vertically in an array between the upper frame plate 101 and the lower frame plate 102. Four pressure plate mounting holes matching the guide rods 303 are formed on the pressure plate 302. Four metal linear bearings 304 are respectively embedded in the four pressure plate mounting holes, and the pressure plate 302 slides with the four guide rods 303 through the four metal linear bearings 304. With this configuration, when the pressure plate 302 rises or falls under the action of the piston rod of the hydraulic cylinder 301, the guide rods 303 guide the pressure plate 302, ensuring smooth movement of the pressure plate 302 and thus allowing the pressure plate 302 to uniformly apply pressure loads to multiple tested power station valves 9. Other components and connections are the same as in specific embodiments one, two, or three.

[0028] Specific Implementation Method Five: Combining Figures 1 to 5 This embodiment describes a separate locking assembly 6 comprising four long bolts 601 and four hexagonal nuts 602. The upper valve seat 4 has an upper valve seat flange 401 at its bottom, with four upper flange holes penetrating the upper and lower surfaces of the flange body. The lower valve seat 5 has a lower valve seat flange 501 at its top, with four lower flange holes penetrating the upper and lower surfaces of the flange body. The upper valve seat flange 401 and the lower valve seat flange 501 are connected and fixed by the four long bolts 601 and four hexagonal nuts 602. With this configuration, after the initial clamping assembly 3 initially clamps multiple tested power station valves 9, the long bolts are used to individually lock the upper valve seat flange 401 and the lower valve seat flange 501, ensuring that each tested power station valve 9 can achieve a complete seal. Other components and connections are the same as in specific embodiments one, two, three, or four.

[0029] Specific Implementation Method Six: Combination Figures 1 to 5 In this embodiment, the upper flange hole is a stepped through hole, and the upper section of the stepped through hole is a hexagonal countersunk hole, which matches the hexagonal nut of the long bolt. With this configuration, the hexagonal nut of the long bolt 601 is fitted into the hexagonal countersunk hole of the upper flange hole. When the operator uses a torque wrench to tighten the hexagonal nut 602, it ensures that the four long bolts 601 and the four hexagonal nuts 602 receive the same torque, ensuring uniform force on the tested power station valve 9 and improving the sealing effect. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0030] Specific implementation method seven: Combination Figures 1 to 5In this embodiment, the upper valve seat flange 401 has an upper threaded groove on its side body that communicates with the upper flange hole, and the lower valve seat flange 501 has a lower threaded groove on its side body that communicates with the lower flange hole. The outer diameter of the long bolt 601 is smaller than the width of the upper and lower threaded grooves. This arrangement facilitates the assembly of the long bolt 601 and prevents interference with other components. By providing upper and lower threaded grooves on the sides of the upper and lower valve seat flanges 401 and 501 respectively, the long bolt 601 can be installed from the side onto the upper and lower valve seat flanges 401 and 501. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0031] Specific implementation method eight: Combination Figures 1 to 5 This embodiment describes a working fluid valve assembly 2 with multiple working fluid channels 201 arranged in parallel. The inlet and outlet of each working fluid channel 201 penetrate the front and rear surfaces of the working fluid valve assembly 2, respectively. Multiple working fluid inlet pipes 202 are connected to the inlets of the multiple working fluid channels 201, and multiple working fluid inlet valves 203 are installed on each of the multiple working fluid inlet pipes 202. With this configuration, each tested power station valve 9 has an independent working fluid inlet pipe 202, and the inlets of multiple working fluid inlet pipes 202 are simultaneously connected to the main working fluid pipeline. The installation of working fluid inlet valves 203 on each working fluid inlet pipe 202 enables individual control of each working fluid inlet pipe 202. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0032] Specific Implementation Method Nine: Combining Figures 1 to 5 This embodiment describes a valve seat 5 with an internal valve seat channel. The inlet and outlet of the valve seat channel extend through the upper and lower surfaces of the valve seat body, respectively. The inlet of the valve seat channel is connected to the outlet of the corresponding working fluid channel 201. A rubber through-hole is formed in the center of the lower sealing rubber 8, and the outlet of the valve seat channel is connected to the corresponding rubber through-hole. With this configuration, the working fluid sequentially passes through the working fluid inlet pipe 202, the working fluid channel 201, the valve seat channel, and the rubber through-hole of the lower sealing rubber 8 before entering the tested power station valve 9. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, seven, or eight.

[0033] In this embodiment, to prevent leakage of the working medium, an O-ring can be provided between the lower surface of the lower valve seat 5 and the upper surface of the working medium valve assembly 2, so that the working medium will not leak when it flows from the working medium inlet pipe 202 into the working medium channel 201.

[0034] Working principle

[0035] Combination Figures 1 to 5 This invention describes the working principle of a power station valve sealing test fixture:

[0036] Before the test, multiple lower sealing rubber sheets 8 are first installed on the top of multiple lower valve seats 5, aligning the rubber through hole in the center of the lower sealing rubber sheet 8 with the valve seat channel of the lower valve seat 5. Then, multiple power station valves 9 under test, in the closed state, are placed on top of the multiple lower sealing rubber sheets 8, with the lower flange of the power station valve 9 aligned with the rubber through hole in the center of the lower sealing rubber sheet 8. Next, multiple upper sealing rubber sheets 7 are installed on the upper flange of the power station valves 9 under test. The hydraulic cylinder 301 is activated, causing the piston rod of the hydraulic cylinder 301 to extend and drive the pressure plate 302 to move downward, thereby achieving initial clamping of the multiple power station valves 9 under test. Finally, the long bolts 601 are installed from the side into the threaded grooves of the upper valve seat flange 401 and the lower valve seat flange 501. The operator uses a torque wrench to tighten the hexagonal nuts 602 to individually lock the upper valve seat flange 401 and the lower valve seat flange 501. This ensures that the four long bolts 601 and the four hexagonal nuts 602 are subjected to the same torque, ensuring the uniformity of force on the tested power station valve 9 and improving the sealing effect.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power plant valve sealing test fixture, characterized in that: The test fixture includes a support frame (1), a working fluid valve assembly (2), a preliminary clamping assembly (3), multiple upper valve seats (4), multiple lower valve seats (5), multiple individual locking assemblies (6), multiple upper sealing rubber sheets (7), and multiple lower sealing rubber sheets (8). The working fluid valve assembly (2) is installed at the bottom of the support frame (1). Multiple lower valve seats (5) are evenly arranged from left to right on the top of the working fluid valve assembly (2). Multiple upper valve seats (4) are respectively arranged opposite to each other above the multiple lower valve seats (5). A preliminary clamping assembly (3) is installed on the top of the frame (1). The movable end of the preliminary clamping assembly (3) is connected to multiple upper valve seats (4). Multiple tested power station valves (9) are respectively provided between the multiple upper valve seats (4) and multiple lower valve seats (5). Each upper valve seat (4) is connected to the corresponding lower valve seat (5) through a separate locking assembly (6). Each tested power station valve (9) has an upper sealing rubber (7) and a lower sealing rubber (8) respectively between the upper and lower flanges of the upper and lower ends and the corresponding upper valve seat (4) and lower valve seat (5).

2. The power plant valve sealing test fixture according to claim 1, characterized in that: The support frame (1) includes an upper frame plate (101), a lower frame plate (102) and multiple connecting columns (103). The upper frame plate (101) and the lower frame plate (102) are arranged horizontally opposite each other. The upper frame plate (101) and the lower frame plate (102) are fixedly connected by multiple connecting columns (103) arranged vertically in an array.

3. The power plant valve sealing test fixture according to claim 2, characterized in that: The initial clamping assembly (3) includes a hydraulic cylinder (301) and a pressure plate (302). The hydraulic cylinder (301) is vertically arranged in the middle of the upper surface of the upper frame plate (101), and the pressure plate (302) is horizontally arranged below the upper frame plate (101). The piston rod end of the hydraulic cylinder (301) passes through the upper frame plate (101) and is fixedly connected to the pressure plate (302).

4. The power plant valve sealing test fixture according to claim 3, characterized in that: The preliminary clamping assembly (3) also includes four guide rods (303) and four metal linear bearings (304). Four guide rods (303) are arranged vertically in an array between the upper frame plate (101) and the lower frame plate (102). Four pressure plate mounting holes that match the guide rods (303) are opened on the pressure plate (302). Four metal linear bearings (304) are respectively embedded in the four pressure plate mounting holes. The pressure plate (302) slides with the four guide rods (303) through the four metal linear bearings (304).

5. The power plant valve sealing test fixture according to claim 4, characterized in that: The individual locking assembly (6) includes four long bolts (601) and four hexagonal nuts (602). The bottom of the upper valve seat (4) is provided with an upper valve seat flange (401). The upper valve seat flange (401) has four upper flange holes that penetrate the upper and lower surfaces of the flange body. The top of the lower valve seat (5) is provided with a lower valve seat flange (501). The lower valve seat flange (501) has four lower flange holes that penetrate the upper and lower surfaces of the flange body. The upper valve seat flange (401) and the lower valve seat flange (501) are connected and fixed by four long bolts (601) and four hexagonal nuts (602).

6. The power plant valve sealing test fixture according to claim 5, characterized in that: The upper flange hole is a stepped through hole, and the upper section of the stepped through hole is a hexagonal countersunk hole, which matches the hexagonal nut of the long bolt.

7. The power plant valve sealing test fixture according to claim 6, characterized in that: The upper valve seat flange (401) has a threaded upper through groove on the side of the flange body that communicates with the upper flange hole, and the lower valve seat flange (501) has a threaded lower through groove on the side of the flange body that communicates with the lower flange hole. The outer diameter of the long bolt (601) is smaller than the groove width of the threaded upper through groove and the threaded lower through groove.

8. A power plant valve sealing test fixture according to claim 1 or 7, characterized in that: The working fluid valve assembly (2) has multiple working fluid channels (201) arranged in parallel inside. The inlet and outlet of each working fluid channel (201) pass through the front and rear surfaces of the working fluid valve assembly (2), respectively. Multiple working fluid inlet pipes (202) are connected to the inlet of the multiple working fluid channels (201), and multiple working fluid inlet valves (203) are installed on the multiple working fluid inlet pipes (202).

9. The power plant valve sealing test fixture according to claim 8, characterized in that: The lower valve seat (5) is provided with a valve seat channel. The inlet and outlet of the valve seat channel pass through the upper and lower surfaces of the valve seat body, respectively. The inlet of the valve seat channel is connected to the outlet of the corresponding working fluid channel (201). A rubber through hole is opened in the center of the lower sealing rubber (8). The outlet of the valve seat channel is connected to the corresponding rubber through hole.

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