A compound damping check valve fluid blocking test system and test method thereof

Abstract

The present invention belongs to the technical field of fluid blocking test, and specifically relates to a compound damping check valve fluid blocking test system and a test method thereof. The present invention includes a first burst pipe simulation component and a second burst pipe simulation component, the inlet of the first burst pipe simulation component is connected to the valve body inlet of the angle damping check valve, the valve body outlet of the angle damping check valve is connected to the outlet of the accumulator through the switch valve SV6, and the inlet of the accumulator is respectively arranged with a gas branch and a liquid branch; the inlet of the second burst pipe simulation component is connected to the valve body inlet of the straight-through damping check valve, and the valve body outlet of the straight-through damping check valve is connected to the outlet of the accumulator through the switch valve SV7; the pressure regulating chamber of the second burst pipe simulation component is connected to the gas source through the switch valve SV2 and the regulating valve CV2 in sequence. The present invention can simultaneously achieve the online test effects of the diagonal damping check valve and the straight-through damping check valve under the same working conditions, and the test data calculation accuracy is higher.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid blocking tests, and in particular relates to a compound damping check valve fluid blocking test system and a test method thereof. Background Art

[0002] The rapid change of mass flow in high-pressure pipelines can cause pressure fluctuations and pressure exceeding the strength limit allowed by the pipeline material. Therefore, after the high-pressure pipeline ruptures, the closing behavior of the damping check valve is particularly important. The damping check valve is equipped with a damping mechanism inside, and the closing time can be customized according to the user's use requirements to keep the fluid dynamic load from the pressure wave within the limit range, eliminate the high-pressure transient in the water supply pipeline, and can be closed as quickly as possible to minimize the loss of water supply. At this stage, the closing performance parameters of the damping check valve must be obtained through experiments. The check valve fluid blocking test method disclosed in CN104359695B and CN109029943A is to change the flow direction of the test medium to establish the test conditions by quickly opening and closing the water pump and the valve. This method is limited by the closing time of the fast switching valve, the response time of the water pump and the size of the valve caliber to be tested. It cannot truly simulate the pipeline rupture accident conditions even at the millisecond level, and the test system is expensive. Therefore, there is an urgent need for a check valve fluid blocking test method that fits the actual working conditions and has high economic benefits. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a compound damping check valve fluid blocking test system, which can achieve the online test effects of the diagonal damping check valve and the straight-through damping check valve under the same working conditions. The test data calculation accuracy is higher, and the usage differences of the two damping check valves under the same working conditions can be verified more accurately and efficiently.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A compound damping check valve fluid blocking test system includes an angle damping check valve and a straight-through damping check valve as test pieces; the system also includes a first pipe burst simulation component and a second pipe burst simulation component, wherein:

[0006] The inlet of the first pipe burst simulation component is connected to the valve body inlet of the angle damping check valve, and the valve body outlet of the angle damping check valve is connected to the outlet of the accumulator through the switch valve SV6. The inlet of the accumulator is respectively arranged with a gas branch and a liquid branch. The gas branch is connected to the gas source via the regulating valve CV1, and the liquid branch is connected to the water storage container via the switch valve SV4, the water pump, and the switch valve SV3; the pressure regulating chamber of the first pipe burst simulation component is connected to the gas source via the switch valve SV1 and the regulating valve CV2 in sequence; the system also includes a bridging waterway, one end of the bridging waterway is connected to a section of the pipeline between the switch valve SV1 and the regulating valve CV2, and the other end of the bridging waterway is connected to the outlet of the water pump, and the switch valve SV5 is arranged on the bridging waterway;

[0007] The inlet of the second burst pipe simulation component is connected to the valve body inlet of the straight-through damping check valve, and the valve body outlet of the straight-through damping check valve is connected to the outlet of the accumulator through the switch valve SV7; the pressure regulating chamber of the second burst pipe simulation component is connected to the air source through the switch valve SV2 and the regulating valve CV2 in sequence;

[0008] A pressure sensor is arranged at the valve body inlet and the valve body outlet of each damping check valve, and the system also includes a displacement sensor for detecting the displacement of the valve disc in the corresponding damping check valve;

[0009] Each burst pipe simulation assembly includes an outer tube body and a crushed diaphragm located in the tube cavity of the outer tube body. The burst pipe simulation assembly also includes a bursting piece. The bursting piece and the crushed diaphragm are arranged in sequence along the tube cavity of the outer tube body, so as to form a closed pressure regulating chamber between a section of the outer tube body tube cavity between the bursting piece and the crushed diaphragm.

[0010] Preferably, the regulating chambers of each pipe burst simulation component are connected to a pressure relief branch and a weighing branch; a pressure sensor P9 and a first pressure relief valve are arranged on the pressure relief branch of the first pipe burst simulation component, and a switch valve SV8 and a weighing container are arranged in sequence on the weighing branch; a pressure sensor P10 and a second pressure relief valve are arranged on the pressure relief branch of the second pipe burst simulation component, and a switch valve SV9 and a weighing container are arranged in sequence on the weighing branch; and weighing sensors for monitoring the weight of the weighing containers are correspondingly provided at the weighing containers.

[0011] Preferably, the valve body inlet of the angle damping check valve is arranged with pressure sensor P3 and pressure sensor P4 in sequence, and the valve body outlet of the angle damping check valve is arranged with pressure sensor P2, pressure sensor P1 and temperature sensor T1 in sequence; the valve body inlet of the straight-through damping check valve is arranged with pressure sensor P7 and pressure sensor P8 in sequence, and the valve body outlet of the straight-through damping check valve is arranged with pressure sensor P6, pressure sensor P5 and temperature sensor T2 in sequence.

[0012] Preferably, a one-way valve is provided at the water pump outlet, and an overpressure relief valve is arranged at each gas source outlet.

[0013] Preferably, one end of the outer tube body is used as the bottom end of the outer tube body, and the crushed diaphragm, diaphragm pressure ring, disc spring, spring base and diaphragm supporting ring are coaxially arranged in sequence from the bottom end to the head end along the axial direction of the outer tube body; the spring base is fixed to the inner wall of the outer tube body, and the diaphragm supporting ring is fixed to the spring base; an extension tube is coaxially extended downward on the diaphragm supporting ring, the inner wall of the extension tube constitutes a bursting flow channel, and the diaphragm pressure ring is coaxially sleeved on the outer wall of the extension tube; the top end of the disc spring is pressed against the spring base, and the bottom end of the disc spring and the diaphragm supporting ring are pressed against each other, so that the diaphragm supporting ring is elastically pressed down on the upper surface of the crushed diaphragm.

[0014] Preferably, the disc spring is of an external slotted structure; a T-slot is radially recessed on the annular wall of the disc spring, the two sections of the T-slot have equal depths, and the width of the outer slot at the slot mouth is twice the width of the inner slot at the slot bottom, the ratio of the disc spring height dimension H to the thickness dimension h is H / h≥3, and the load-displacement curve presents a nonlinear negative stiffness characteristic.

[0015] Preferably, an inner flange-shaped closing opening is provided at the bottom end of the outer tube body, and the inlet ring cover is fixed at the closing opening from bottom to top, and the inlet ring cover cooperates with the closing opening to clamp the outer edge of the crushed diaphragm; a fitting gap exists between the outer ring surface of the diaphragm pressure ring and the closing opening, and a weakening ring groove with a circular notch facing downward is coaxially recessed on the crushed diaphragm at the fitting gap; when the bottom ring surface of the diaphragm pressure ring is elastically pressed down on the crushed diaphragm, a reserved channel exists between the crushed diaphragm and the inlet ring cover for water or gas to enter the weakening ring groove cavity.

[0016] Preferably, the diaphragm support ring has an outer shape of a two-stage stepped sleeve, the large diameter section of the diaphragm support ring constitutes a mating section that is threaded with the spring base, and the small diameter section of the diaphragm support ring constitutes the extension tube; the barrel cavity of the large diameter section is in the shape of a trumpet hole that is thick at the top and thin at the bottom, and the trumpet hole-shaped barrel cavity of the spring base is a two-stage variable diameter hole, and includes an upper trumpet section located at the top and a lower trumpet section that matches the bottom aperture of the upper trumpet section, so that the spring base and the barrel cavity of the diaphragm support ring are combined with each other to form an expansion cone flow channel structure; on the axial section of the outer tube body, the barrel cavity of the large diameter section is at an angle of 55° with the center line of the bursting flow channel, the hole wall of the small trumpet hole at the spring base is at an angle of 35° with the center line of the bursting flow channel, and the hole wall of the large trumpet hole is at an angle of° with the center line of the bursting flow channel.

[0017] Preferably, an outlet ring cover is coaxially arranged at the top end of the outer tube body, and an upper pressure ring is coaxially arranged on the outlet ring cover so as to clamp and fix the bursting disc at the outlet ring cover.

[0018] Preferably, a test method using the compound damping check valve fluid blocking test system is characterized by comprising the following steps:

[0019] 1) After the angle damping check valve and the straight-through damping check valve are reversely installed at the corresponding pipeline, open the switch valve SV3 and the switch valve SV4, start the water pump, and transfer the water in the water storage container to the accumulator, then open the switch valve SV6 and the switch valve SV7, so that the water in the water storage container flows through the two groups of damping check valves respectively, so as to determine that the two groups of damping check valves are both at 100% opening; then, close all valves in step 1);

[0020] 2) Open the regulating valve CV1 to charge the accumulator with high-pressure gas, and gradually increase the pressure to the test pressure; then, open the switch valve SV6 and the switch valve SV7, respectively charge the gas to the test pressure in the pipelines where the two groups of damping check valves are located, open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, so as to charge the pressure regulating chambers of the two groups of burst pipe simulation components with high-pressure gas until the pressure is increased to the valve test pressure; close all the valves in step 2) to maintain the test pressure value;

[0021] 3) Open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, and continue to fill the pressure regulating chambers of the two sets of burst pipe simulation components with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc ruptures, the pressure in the pressure regulating chamber is released to atmospheric pressure, and the pressure difference causes the collapsed diaphragm to displace, weakening the local plastic deformation at the annular groove, causing the collapsed diaphragm to rupture, and the pipelines where the two sets of damping check valves are located will simultaneously produce burst pipes under the same working conditions;

[0022] 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the angle damping check valve and the straight-through damping check valve, and records the pressure difference, impact pressure and peak pressure. At the same time, the displacement sensor collects and records the displacement of the valve disc of the angle damping check valve and the straight-through damping check valve and the valve closing time; at this point, the test is over.

[0023] The beneficial effects of the present invention are:

[0024] (1) When the present invention is actually working, the inlet of each burst pipe simulation assembly is connected to the valve body inlet of the corresponding damping check valve, and the valve body outlet of the corresponding damping check valve is connected to the outlet of the accumulator, that is, the corresponding damping check valve as the test piece must be installed in reverse.

[0025] Through the above scheme, the present invention takes a different approach to establish the test conditions of sudden sudden changes through the setting of a specific pipe burst simulation component; and in order to simulate the accurate pipe burst pressure as realistically as possible and shorten the pipe burst time as much as possible, the pipe burst simulation component of the present invention uses the bursting disc as the active rupture part and the crushed diaphragm as the passive rupture part, thereby achieving a controllable pipe burst effect; more importantly, by setting a pressure regulating chamber, that is, a regulating chamber, when working, by filling the pressure regulating chamber with high-pressure gas, when the pressure regulating chamber is pressurized to the required test pressure, that is, the bursting disc ruptures, the pressure of the pressure regulating chamber is instantly released to the atmospheric pressure, and the crushed diaphragm is displaced under the action of the pressure difference, and the local plastic deformation is generated at the weakening ring, the crushed diaphragm is ruptured, and the pipe burst condition is generated, and the operation is extremely convenient and reliable.

[0026] In summary, the present invention utilizes a built-in specific pipe burst simulation component to accurately control the pipe burst pressure and storage time in the pipeline, which can ensure the high accuracy of the two groups of damping check valve test data while ensuring cost-effectiveness, and is also more conducive to the horizontal comparison of the test results under the same working conditions between the two, with significant results.

[0027] (2) On the basis of the above structure, each burst pipe simulation component is additionally provided with a disc spring, so as to cooperate with the aforementioned adjustment chamber, further realizing the purpose of accurate control of test parameters such as burst pipe pressure and millisecond burst pipe time. Specifically, due to the existence of the disc spring, on the one hand, before the test, the disc spring can rely on its own elastic force to ensure that the hard pressure of the diaphragm pressure ring on the crushed diaphragm is transformed into a relatively flexible elastic pressure. At this time, the disc spring can achieve the self-balancing effect of the force of the entire diaphragm system, which provides a basic guarantee for the accuracy of subsequent burst pipe data. On the other hand, during the test, when the crushed diaphragm is deformed and finally ruptured, the diaphragm pressure ring is pressed upward, pushing the disc spring to deform, so that the disc spring is instantly switched from the original pressure state to the failure state, that is, the elastic force becomes zero; this can effectively eliminate the possible influence of the existence of the disc spring on the burst pipe test, thereby further ensuring the accuracy of subsequent burst pipe data.

[0028] (3) The pipe burst simulation component described in the present invention can reasonably select the pressure regulating chamber gas pressurization test method or liquid pressurization test method according to different test valve types and test parameter requirements. The test method is simple, easy to operate, and flexible. At the same time, the secondary bursting disc used in the component has no fixed structural form requirements and restrictions, and can be flexibly adjusted and selected according to the parameters required for the test.

[0029] (4) The disc spring of the present invention adopts an external slotted diaphragm structure, which has a completely different design concept and use environment from the traditional diaphragm disc spring. The traditional diaphragm disc spring focuses on how to prevent buckling and self-reset and service life when designing. The ratio of its height H to thickness h is usually less than 2, and the use range of its load displacement curve is also different from that of the present invention. The external slotted diaphragm disc spring designed by the present invention focuses on its load characteristics of irreversible overload failure and negative stiffness during use. Its H / h is ≥3, and the use range of its load displacement curve is further moved forward. After a test spring fails, it is replaced immediately, which is convenient and quick to use.

[0030] (5) The spring base and the diaphragm support ring of the present invention cooperate with each other in the cylindrical cavity to form a two-stage expansion cone flow channel structure, which can be applied to the burst pipe test of the flash jet flow under the saturated water and supercooled water test media, and can reduce the reverse fluid thrust caused by the burst pipe, thereby avoiding damage to the entire test pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the layout diagram of the test pipeline of the present invention;

[0032] Figure 2 It is a schematic diagram of the initial states of the first pipe burst simulation assembly and the second pipe burst simulation assembly of the present invention;

[0033] Figure 3 It is a schematic diagram of the state of the first pipe burst simulation assembly and the second pipe burst simulation assembly after pipe burst of the present invention;

[0034] Figure 4 It is a structural schematic diagram of an expansion cone flow channel structure;

[0035] Figure 5 It is a cross-sectional view of a disc spring;

[0036] Figure 6 It is a top view of the disc spring;

[0037] Figure 7 This is the load-displacement curve of the disc spring.

[0038] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0039] 10-outer tube body 11-closed

[0040] 20-crush the diaphragm 21-weaken the ring groove

[0041] 30-bursting disc 40-diaphragm pressure ring 50-disc spring 51-T-slot

[0042] 60-spring base 70-diaphragm support ring 71-extension tube

[0043] 80-inlet ring cover 90-outlet ring cover 91-upper pressure ring

[0044] 101-Angle Damping Check Valve 102-Straight-Through Damping Check Valve

[0045] 110-Accumulator 120-Water storage container

[0046] 130-Weighing container 140-Water pump DETAILED DESCRIPTION

[0047] For ease of understanding, here we combine Figure 1-7 The specific structure and working mode of the present invention are further described as follows:

[0048] When it is necessary to test the straight-through damping check valve 102 and the angle damping check valve 101 simultaneously in order to compare the working differences between the two under the same conditions, the structure of the embodiment of the present invention is as follows: Figure 1 As shown, the overall system includes: a gas source composed of two high-pressure nitrogen groups, a water storage container 120, a water pump 140, an accumulator 110, a test piece, namely a straight-through damping check valve 102 and an angle damping check valve 101, two groups of burst pipe simulation components, various sensors, a data acquisition and processing system, etc.

[0049] The gas source is composed of two groups of high-pressure nitrogen gas groups with different volumes, one of which provides the pressure required for the fluid blocking test for the accumulator 110, that is, the accumulator 110 is connected to the gas source via the regulating valve CV1, and the pressure required for the test can be filled into the accumulator 110, and a group of overpressure relief valves are used as safety valves. The other group of high-pressure nitrogen gas provides pressure for the pressure regulating chambers of the two groups of burst pipe simulation components, that is, the gas source is connected to the pressure regulating chamber of the first burst pipe simulation component via the regulating valve CV2 and the switch valve SV1 on the one hand, and is connected to the pressure regulating chamber of the second burst pipe simulation component via the regulating valve CV2 and the switch valve SV2 on the other hand.

[0050] The water storage container 120 can be in the form of a water tank, a water storage tank, etc., and a switch valve SV3, a water pump 140, a one-way valve, and a switch valve SV4 are arranged in sequence between the water storage container 120 and the accumulator 110. A bridging water path is arranged between the one-way valve and the switch valve SV4, and a switch valve SV5 is arranged on the bridging water path. The bridging water path can transport the liquid in the water storage container 120 to the pressure regulating chamber of the corresponding pipe burst simulation component.

[0051] The outlets of the accumulator 110 are respectively connected Figure 1The pipeline where the angle damping check valve 101 and the straight-through damping check valve 102 are located. In actual settings, the pipeline where the angle damping check valve 101 is located is provided with a switch valve SV6, a temperature sensor T1, a pressure sensor P1, a pressure sensor P2, an angle damping check valve 101, a pressure sensor P3, and a pressure sensor P4 in sequence, and the end of the pipeline is connected to the inlet ring cover 80 of the first burst pipe simulation component. Similarly, the pipeline where the straight-through damping check valve 102 is located is provided with a switch valve SV7, a temperature sensor T2, a pressure sensor P5, a pressure sensor P6, a straight-through damping check valve 102, a pressure sensor P7, and a pressure sensor P8 in sequence, and the end of the pipeline is connected to the inlet ring cover 80 of the second burst pipe simulation component.

[0052] When installing each damping check valve, please pay attention to the following: Figure 1 As shown, the corresponding damping check valve is installed in the opposite direction to the flow direction of the pipeline medium; at the same time, both groups of damping check valves should be equipped with displacement sensors to monitor the displacement movement of the valve disc in the corresponding damping check valve.

[0053] In addition, the regulating chambers of the two groups of pipe burst simulation components are connected to the pressure relief branch and the weighing branch; the pressure sensor P9 and the first pressure relief valve are arranged on the pressure relief branch of the first pipe burst simulation component, and the switch valve SV8 and the weighing container 130 are arranged in sequence on the weighing branch; the pressure sensor P10 and the second pressure relief valve are arranged on the pressure relief branch of the second pipe burst simulation component, and the switch valve SV9 and the weighing container 130 are arranged in sequence on the weighing branch. The weighing container 130 is provided with a weighing sensor for monitoring the weight of the weighing container 130.

[0054] After the above pipelines are arranged, the data acquisition and processing system is connected to the pressure sensor, displacement sensor, weighing sensor, etc., so that the test data can be monitored and collected in real time.

[0055] Based on the above structure, the present invention also proposes a pipe burst simulation component, which can be used as Figure 1 The first pipe burst simulation component and the second pipe burst simulation component are used. The specific structure of the pipe burst simulation component is shown in 2-6, and the installation position is shown in Figure 1 As shown, where:

[0056] The pipe burst simulation component uses the outer tube body 10 as a carrier, and the bottom end surface of the outer tube body 10 is arranged with a closing mouth 11 so that the whole is formed into a plunger cylinder shape, and the outer tube body 10 is in the cylinder cavity as shown in FIG. Figure 2As shown, the inlet ring cover 80, the crushed diaphragm 20, the diaphragm pressure ring 40, the disc spring 50, the diaphragm support ring 70 with the extension tube 71, the spring base 60, the upper pressure ring 91, the bursting disc 30 and the outlet ring cover 90 are arranged in order from bottom to top. Of course, as a standard part, the bursting disc 30 can reasonably select existing mature bursting disc 30 products according to the test parameters, and is not limited to a specific structural form. Among them:

[0057] During actual assembly, the inlet ring cover 80 may be provided with a flange bolt hole, and connected to the main pipe by bolts, and sealed by a metal sealing ring. A positioning ring surface is provided on the inner end surface of the inlet ring cover 80, so that after contacting the positioning ring groove at the closing end 11 of the outer tube body, it can be connected by bolts; a sealing ring is provided on the positioning ring surface to ensure the sealing between the inlet ring cover 80 and the closing end 11.

[0058] like Figure 2-3 As shown, the spring base 60 and the outer tube 10, and the diaphragm support ring 70 and the spring base 60 are all threadedly connected. The spring base 60 and the diaphragm support ring 70 are installed to form an expansion cone flow channel structure, which can be applied to the flash jet flow burst test under saturated water and supercooled water test media. Figure 4 As shown, the angle between the L1 section at the diaphragm support ring 70, i.e., the large diameter section, and the center line of the burst pipe flow channel is α=55°, the angle between the L2 section at the spring base 60, i.e., the lower horn section, and the center line of the burst pipe flow channel is β=35°, and the angle between the L3 section, i.e., the large horn hole, and the center line of the burst pipe flow channel is γ=10°. The above angle design can effectively reduce the reverse fluid thrust generated by the burst pipe, and minimize the damage to the entire test pipeline.

[0059] For the disc spring 50, its appearance is as follows Figure 5-6 As shown, the outer ring surface is provided with evenly distributed special-shaped grooves or T-shaped grooves 51, the outer length of the special-shaped groove is equal to the inner length, the outer width is twice the inner width, the ratio of the height dimension H to the thickness dimension h of the disc spring 50 is H / h≥3, and its load displacement curve presents a nonlinear negative stiffness characteristic. So far, the design of traditional diaphragm disc springs focuses on how to prevent buckling and self-reset and service life. The ratio of its height H to its thickness h is usually less than 2, and the use range of its load displacement curve is usually in Figure 7 The AB section shown; and the disc spring 50 designed by the present invention focuses on the use of its overload failure and irreversible negative stiffness during use, its H / h ≥ 3, and its load displacement curve is used in the range of Figure 7 The BC section shown was replaced after the spring failed during a test. Figure 6 There are 16 special-shaped slots in the machine, and of course the number can be increased or decreased depending on the situation.

[0060] When the burst pipe simulation assembly is actually installed, the order is usually as follows: first, the crushed diaphragm 20 is welded to the closing port 11, and then the diaphragm pressure ring 40, disc spring 50, diaphragm support ring 70, and spring base 60 are installed in the outer tube body 10 in sequence; then, the outlet ring cover 90, bursting disc 30, and upper pressure ring 91 are installed and connected separately, and then the whole is connected to the outer tube body 10 by bolts, and finally the inlet ring cover 80 is connected to the outer tube body 10, so as to further clamp and fix the crushed diaphragm 20. When the crushed diaphragm 20 is designed, it is as follows Figure 2 The double arc structure shown in the figure has a first arc located in the central area and is simultaneously sleeved in the tube cavity of the extension tube 71. The root of the second arc is provided with a weakening annular groove 21 so as to generate a weakening effect when impacted. Figure 3 Deformation shown.

[0061] The method of using the pipe burst simulation assembly includes the following steps:

[0062] The inlet pressure of the burst pipe simulation assembly is P1, the pressure of the pressure regulating chamber is P2, the outlet pressure is P3, the preload force of the disc spring is F, the rupture pressure of the crushed diaphragm 20 is P, and the bursting pressure of the bursting disc 30 is P′, where P=P′;

[0063] At the beginning of the test, the pressure in the pressure regulating chamber is P2=(70%~80%)P, at which time the pressure acting on the bursting disc 30 is P2-P3=(70%~80%)P, and the pressure acting on the crushed diaphragm 20 is P1-P2=P-(70%~80%)P=(20%~30%)P; the crushed diaphragm 20 and the bursting disc 30 are both kept in a stable state;

[0064] The pressure in the pressure regulating chamber is adjusted to P2>P=P′, the bursting disc 30 explodes, P2=P3=0, and the pressure acting on the crushed diaphragm 20 is P1-P2=P. The crushed diaphragm 20 axially pushes the diaphragm pressure ring 40 to move, causing the disc spring 50 to produce buckling deformation until the disc spring 50 moves to the failure position. At this time, the spring force instantly drops to 0, and at the same time, the annular groove 21 is weakened and moves to the position of the diaphragm support ring 70 and produces local plastic deformation, and the crushed diaphragm 20 ruptures.

[0065] Meanwhile, the test method of the present invention comprises the following steps:

[0066] 1) After the angle damping check valve 101 and the straight-through damping check valve 102 are reversely installed at the corresponding pipelines, open the switch valve SV3 and the switch valve SV4, start the water pump, and transfer the water in the water storage container to the accumulator. Then open the switch valve SV6 and the switch valve SV7 to make the water in the water storage container 120 flow through the two groups of damping check valves respectively, so as to determine that the two groups of damping check valves are both at 100% opening; then, close all valves in step 1);

[0067] 2) Open the regulating valve CV1 to charge the accumulator 110 with high-pressure gas, and gradually increase the pressure to the test pressure; then, open the switch valve SV6 and the switch valve SV7, respectively charge the gas to the test pressure in the pipelines where the two groups of damping check valves are located, open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, so as to charge the pressure regulating chambers of the two groups of burst pipe simulation components with high-pressure gas until the pressure is increased to the valve test pressure; close all the valves in step 2) to maintain the test pressure value;

[0068] 3) Open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, and continue to fill the pressure regulating chambers of the two sets of burst pipe simulation components with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc ruptures, the pressure in the pressure regulating chamber is released to atmospheric pressure, and the pressure difference causes the collapsed diaphragm to displace, weakening the local plastic deformation at the annular groove, causing the collapsed diaphragm to rupture, and the pipelines where the two sets of damping check valves are located will simultaneously produce burst pipes under the same working conditions;

[0069] 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the angle damping check valve 101 and the straight-through damping check valve 102, and records the pressure difference, impact pressure and peak pressure. At the same time, the displacement sensor collects and records the displacement of the valve disc of the angle damping check valve 101 and the straight-through damping check valve 102 and the valve closing time; at this point, the test is completed.

[0070] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0071] 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.

[0072] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A compound damping check valve fluid blocking test system, comprising an angle damping check valve (101) and a straight-through damping check valve (102) as test pieces; characterized in that: The system also includes a first pipe burst simulation component and a second pipe burst simulation component, wherein: The inlet of the first pipe burst simulation component is connected to the valve body inlet of the angle damping check valve (101), and the valve body outlet of the angle damping check valve (101) is connected to the outlet of the accumulator (110) through the switch valve SV6. The inlet of the accumulator (110) is respectively arranged with an air branch and a liquid branch. The air branch is connected to the air source via the regulating valve CV1, and the liquid branch is connected to the water storage container (120) via the switch valve SV4, the water pump (140), and the switch valve SV3. The pressure regulating chamber of the first pipe burst simulation component is connected to the air source via the switch valve SV1 and the regulating valve CV2 in sequence. The system also includes a bridging water path, one end of the bridging water path is connected to a section of the pipeline between the switch valve SV1 and the regulating valve CV2, and the other end of the bridging water path is connected to the outlet of the water pump. The switch valve SV5 is arranged on the bridging water path. The inlet of the second burst pipe simulation component is connected to the valve body inlet of the straight-through damping check valve (102), and the valve body outlet of the straight-through damping check valve (102) is connected to the outlet of the accumulator (110) through the switch valve SV7; the pressure regulating chamber of the second burst pipe simulation component is connected to the gas source through the switch valve SV2 and the regulating valve CV2 in sequence; A pressure sensor is arranged at the valve body inlet and the valve body outlet of each damping check valve, and the system also includes a displacement sensor for detecting the displacement of the valve disc in the corresponding damping check valve; Each pipe burst simulation assembly comprises an outer pipe body (10) and a crushing diaphragm (20) located in the lumen of the outer pipe body (10). The pipe burst simulation assembly further comprises a bursting disc (30). The bursting disc (30) and the crushing diaphragm are arranged in sequence along the lumen of the outer pipe body (10), so that a closed pressure regulating chamber is formed between a section of the lumen of the outer pipe body (10) between the bursting disc (30) and the crushing diaphragm (20).

2. A compound damping check valve fluid blocking test system according to claim 1, characterized in that: A pressure relief branch and a weighing branch are arranged in communication at the pressure regulating chamber of each pipe burst simulation assembly; a pressure sensor P9 and a first pressure relief valve are arranged on the pressure relief branch of the first pipe burst simulation assembly, and a switch valve SV8 and a weighing container (130) are arranged in sequence on the weighing branch; a pressure sensor P10 and a second pressure relief valve are arranged on the pressure relief branch of the second pipe burst simulation assembly, and a switch valve SV9 and a weighing container (130) are arranged in sequence on the weighing branch; and a weighing sensor for monitoring the weight of the weighing container (130) is correspondingly arranged at each weighing container (130).

3. A compound damping check valve fluid blocking test system according to claim 1, characterized in that: The valve body inlet of the angle damping check valve (101) is arranged with a pressure sensor P3 and a pressure sensor P4 in sequence, and the valve body outlet of the angle damping check valve (101) is arranged with a pressure sensor P2, a pressure sensor P1 and a temperature sensor T1 in sequence; the valve body inlet of the straight-through damping check valve (102) is arranged with a pressure sensor P7 and a pressure sensor P8 in sequence, and the valve body outlet of the straight-through damping check valve (102) is arranged with a pressure sensor P6, a pressure sensor P5 and a temperature sensor T2 in sequence.

4. A compound damping check valve fluid blocking test system according to claim 1, characterized in that: A one-way valve is provided at the outlet of the water pump (140), and an overpressure relief valve is arranged at each gas source outlet.

5. A compound damping check valve fluid blocking test system according to claim 1 or 2 or 3 or 4, characterized in that: With one end of the fixed crushing diaphragm (20) as the bottom end of the outer tube body (10), the crushing diaphragm (20), the diaphragm pressure ring (40), the disc spring (50), the spring base (60) and the diaphragm support ring (70) are coaxially arranged in sequence from the bottom end to the head end along the axial direction of the outer tube body (10); the spring base (60) is fixed on the inner wall of the outer tube body (10), and the diaphragm support ring (70) is fixed on the spring base (60); an extension tube (71) coaxially extends downward on the diaphragm support ring, the inner wall of the extension tube (71) forms a bursting flow channel, and the diaphragm pressure ring (40) is coaxially sleeved on the outer wall of the extension tube (71); the top end of the disc spring (50) is tightly pressed against the spring base (60), and the bottom end of the disc spring (50) and the diaphragm pressure ring (40) are pressed against each other, so that the diaphragm pressure ring (40) is elastically pressed downward on the upper surface of the crushing diaphragm (20).

6. A compound damping check valve fluid blocking test system according to claim 5, characterized in that: The disc spring (50) is of an external slotted structure; a T-shaped slot (51) is radially recessed on the annular wall of the disc spring (50); the two sections of the T-shaped slot (51) have equal depths, and the width of the outer slot at the slot mouth is twice the width of the inner slot at the slot bottom; the ratio of the height dimension H to the thickness dimension h of the disc spring (50) is H / h≥3, and the load displacement curve presents a nonlinear negative stiffness characteristic.

7. A compound damping check valve fluid blocking test system according to claim 5, characterized in that: The bottom end of the outer tube body (10) is provided with an inwardly turned-edge-shaped closing opening (11), and the inlet ring cover (80) is fixed at the closing opening (11) from bottom to top, and the inlet ring cover (80) cooperates with the closing opening (11) to clamp the outer edge of the crushed diaphragm (20); a matching gap exists between the outer ring surface of the diaphragm pressure ring (40) and the closing opening (11), and a weakening ring groove (21) with a circular notch facing downward is coaxially concavely provided on the crushed diaphragm (20) at the matching gap; when the bottom ring surface of the diaphragm pressure ring (40) is elastically pressed down on the crushed diaphragm (20), a reserved channel exists between the crushed diaphragm (20) and the inlet ring cover (80) for water or gas to enter the groove cavity of the weakening ring groove (21).

8. A compound damping check valve fluid blocking test system according to claim 5, characterized in that: The diaphragm support ring (70) has a two-stage stepped sleeve shape, the large diameter section of the diaphragm support ring (70) constitutes a mating section that is threadedly mated with the spring base (60), and the small diameter section of the diaphragm support ring (70) constitutes the extension tube (71); the barrel cavity of the large diameter section is in the shape of a trumpet hole that is thick at the top and thin at the bottom, and the trumpet hole-shaped barrel cavity of the spring base (60) is a two-stage variable diameter hole, and includes an upper trumpet section located at the top and a lower trumpet section that matches the bottom aperture of the upper trumpet section, so that the barrel cavities of the spring base (60) and the diaphragm support ring (70) are combined to form an expansion cone flow channel structure; on the axial cross section of the outer tube body (10), the barrel cavity of the large diameter section forms an angle of 55° with the center line of the bursting flow channel, the hole wall of the small trumpet hole at the spring base (60) forms an angle of 35° with the center line of the bursting flow channel, and the hole wall of the large trumpet hole forms an angle of 10° with the center line of the bursting flow channel.

9. A compound damping check valve fluid blocking test system according to claim 5, characterized in that: An outlet ring cover (90) is coaxially arranged at the top end of the outer tube body (10), and an upper pressure ring (91) is coaxially arranged on the outlet ring cover (90) so as to clamp and fix the bursting disc (30) at the outlet ring cover (90).

10. A test method using the compound damping check valve fluid blocking test system as claimed in claim 1, 2, 3 or 4, characterized in that The following steps are involved: 1) After the angle damping check valve (101) and the straight-through damping check valve (102) are both reversely installed at the corresponding pipelines, the switch valve SV3 and the switch valve SV4 are opened, and the water pump (140) is started to transfer the water in the water storage container (120) to the accumulator (110). Subsequently, the switch valve SV6 and the switch valve SV7 are opened to allow the water in the water storage container (120) to flow through the two groups of damping check valves respectively, so as to determine that the two groups of damping check valves are both at 100% opening; thereafter, all valves in step 1) are closed; 2) Open the regulating valve CV1 to charge the accumulator (110) with high-pressure gas, and gradually increase the pressure to the test pressure; then, open the switch valve SV6 and the switch valve SV7, respectively charge the gas to the test pressure in the pipelines where the two groups of damping check valves are located, open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, so as to charge the pressure regulating chambers of the two groups of burst pipe simulation components with high-pressure gas until the pressure is increased to the valve test pressure; close all the valves in step 2) to maintain the test pressure value; 3) Open the regulating valve CV2, the switch valve SV1 and the switch valve SV2, and continue to fill the pressure regulating chambers of the two sets of burst pipe simulation components with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc ruptures, the pressure in the pressure regulating chamber is released to atmospheric pressure, and the pressure difference causes the collapsed diaphragm to displace, weakening the local plastic deformation at the annular groove, causing the collapsed diaphragm to rupture. The pipelines where the two sets of damping check valves are located will simultaneously burst under the same working conditions; 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the angle damping check valve (101) and the straight-through damping check valve (102), and records the pressure difference, impact pressure and peak pressure. At the same time, the displacement sensor collects and records the displacement of the valve disc of the angle damping check valve and the straight-through damping check valve and the valve closing time. At this point, the test is completed.

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