A single 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 single damping check valve fluid blocking test system and a test method thereof. The system includes a damping check valve and a burst pipe simulation component, the inlet of the burst pipe simulation component is connected to the valve body inlet of the damping check valve, the valve body outlet of the damping check valve is connected to the outlet of the accumulator via the switch valve SV6, the inlet of the accumulator 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 via the switch valve SV4, the water pump, and the switch valve SV3; the pressure regulating chamber of the burst pipe 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 circuit. The system uses the built-in burst pipe simulation component to accurately control the burst pipe pressure and storage time in the pipeline, which can ensure the high accuracy of the damping check valve test data while ensuring cost-effectiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid blocking tests, and in particular relates to a single 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 provide a single damping check valve fluid blocking test system, which utilizes a built-in burst pipe simulation component to accurately control the burst pipe pressure and storage time in the pipeline, thereby ensuring the high accuracy of the damping check valve test data while ensuring cost-effectiveness.

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

[0005] A single damping check valve fluid blocking test system, including a damping check valve as a test piece, characterized in that: the system also includes a burst pipe simulation component, the inlet of the burst pipe simulation component is connected to the valve body inlet of the damping check valve, the valve body outlet of the damping check valve is connected to the outlet of the accumulator via a switch valve SV6, the inlet of the accumulator is respectively arranged with an air branch and a liquid branch, the air branch is connected to an air source via a regulating valve CV1, and the liquid branch is connected to a water storage container via a switch valve SV4, a water pump, and a switch valve SV3; the pressure regulating chamber of the burst pipe 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 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, 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;

[0006] Pressure sensors are arranged at the valve body inlet and the valve body outlet of the damping check valve, and the system also includes a displacement sensor for detecting the displacement of the valve disc in the damping check valve;

[0007] The burst pipe simulation component includes an outer tube body and a crushed diaphragm located in the tube cavity of the outer tube body. The component 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.

[0008] Preferably, the regulating chamber is also connected to a pressure relief branch and a weighing branch, a pressure sensor P9 and a pressure relief valve are arranged on the pressure relief branch, and a switch valve SV8 and a weighing container are arranged in sequence on the weighing branch; a weighing sensor for monitoring the weight of the weighing container is provided at the weighing container.

[0009] Preferably, the valve body inlet of the damping check valve is sequentially arranged with a pressure sensor P3 and a pressure sensor P4, and the valve body outlet of the damping check valve is sequentially arranged with a pressure sensor P2, a pressure sensor P1 and a temperature sensor T.

[0010] Preferably, a one-way valve is provided at the water pump outlet, and an overpressure relief valve is arranged at each gas source outlet.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] Preferably, a test method using the single damping check valve fluid blocking test system is characterized by comprising the following steps:

[0017] 1) After the damping check valve is reversely installed, 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 to allow the water in the water storage container to flow through the damping check valve to determine that the damping check valve is at 100% opening; then, close all valves in step 1);

[0018] 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, charge the pipeline where the damping check valve is located with gas to the test pressure, open the regulating valve CV2 and the switch valve SV1, and charge the pressure regulating chamber of the burst pipe simulation component with high-pressure gas until the pressure is increased to the valve test pressure; close all valves in step 2) to maintain the test pressure value;

[0019] 3) Open the regulating valve CV2 and the switch valve SV1, and continue to fill the pressure regulating chamber of the pipe burst simulation component with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc rupture pressure, the bursting disc is opened and ruptured at the same time. The pressure in the pressure regulating chamber is released to atmospheric pressure. Under the action of the pressure difference, the crushed diaphragm is displaced, and the local plastic deformation at the ring groove is weakened. The crushed diaphragm ruptures, and the pipe burst condition occurs;

[0020] 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the damping check valve, records the pressure difference, impact pressure and peak pressure, and at the same time, the displacement sensor collects and records the displacement of the damping check valve disc and the valve closing time.

[0021] The beneficial effects of the present invention are:

[0022] (1) When the present invention is actually working, the inlet of the burst pipe simulation component is connected to the valve body inlet of the damping check valve, and the valve body outlet of the damping check valve is connected to the outlet of the accumulator via the switch valve SV6, that is, the damping check valve as the test piece must be installed in reverse.

[0023] Through the above scheme, the present invention takes a different approach to establish the test conditions of sudden sudden changes through the setting of the burst pipe simulation component; and in order to simulate the accurate burst pipe pressure as realistically as possible and shorten the burst pipe time as much as possible, the burst pipe 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 the controllable burst pipe effect; more importantly, by setting the pressure regulating chamber, that is, the 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 rupture pressure, the bursting disc is opened and ruptured at the same time, 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, and the crushed diaphragm is ruptured, and the burst pipe working condition is generated, and the operation is extremely convenient and reliable.

[0024] In summary, the present invention utilizes the built-in 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 damping check valve test data while ensuring cost-effectiveness.

[0025] (2) On the basis of the above structure, a disc spring is also added to the burst pipe simulation component, so as to cooperate with the aforementioned adjustment chamber to further achieve 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 the subsequent burst pipe data, with significant results.

[0026] (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.

[0027] (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.

[0028] (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

[0029] Figure 1 It is the layout diagram of the test pipeline of the present invention;

[0030] Figure 2 is a schematic diagram of the initial state of the pipe burst simulation assembly of the present invention;

[0031] Figure 3 It is a schematic diagram of the state of the pipe burst simulation assembly of the present invention after the pipe burst;

[0032] Figure 4 It is a structural schematic diagram of an expansion cone flow channel structure;

[0033] Figure 5 is a cross-sectional view of a disc spring;

[0034] Figure 6 It is a top view of the disc spring;

[0035] Figure 7 This is the load-displacement curve of the disc spring.

[0036] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0037] 10-outer tube body 11-closed

[0038] 20-crush the diaphragm 21-weaken the ring groove

[0039] 30-bursting disc 40-diaphragm pressure ring 50-disc spring 51-T-slot

[0040] 60-spring base 70-diaphragm support ring 71-extension tube

[0041] 80-inlet ring cover 90-outlet ring cover 91-upper pressure ring

[0042] 100- Damping check valve 110- Accumulator 120- Water storage container

[0043] 130-Weighing container 140-Water pump DETAILED DESCRIPTION

[0044] For ease of understanding, the test process of the angle damping check valve is taken as an example. Figure 1-7 The specific structure and working mode of the present invention are further described below; if other damping check valves need to be tested separately, the corresponding test pieces can be replaced:

[0045] When an angle damping check valve is used as the test piece, the structure of the embodiment of the present invention is as follows: Figure 1 As shown, the overall system includes: a gas source consisting of two high-pressure nitrogen groups, a water storage container 120, a water pump 140, an accumulator 110, a test piece, namely an angle damping check valve, a burst pipe simulation component, various sensors, a data acquisition and processing system, etc.

[0046] The gas source is composed of two groups of high-pressure nitrogen gas 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 chamber of the burst pipe simulation component, that is, the gas source is connected to the pressure regulating chamber via the regulating valve CV2 and the switch valve SV1 at the same time.

[0047] 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 burst pipe simulation component.

[0048] Accumulator 110 outlet is connected Figure 1 The main pipeline where the damping check valve 100 is located; in actual setting, the main pipeline is equipped with a switch valve SV6, a temperature sensor T, a pressure sensor P1, a pressure sensor P2, a damping check valve 100, a pressure sensor P3, and a pressure sensor P4 in sequence, and the end of the main pipeline is connected to the inlet ring cover 80 of the burst pipe simulation component. When installing the damping check valve 100, it should be noted that Figure 1 As shown, the damping check valve 100 is installed in the opposite direction to the flow direction of the medium in the main pipeline. At the same time, the damping check valve 100 is provided with a displacement sensor to monitor the displacement movement of the valve disc in the damping check valve 100.

[0049] The regulating chamber is also connected to a pressure relief branch and a weighing branch. A pressure sensor P9 and a pressure relief valve are arranged on the pressure relief branch, and a switch valve SV8 and a weighing container 130 are arranged in sequence on the weighing branch. A weighing sensor for monitoring the weight of the weighing container 130 is provided at the weighing container 130.

[0050] 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.

[0051] On the basis of the above structure, the present invention also proposes a pipe burst simulation assembly, the specific structure of which is shown in Figure 2-6, and the installation position is shown in Figure 2-6. Figure 1 As shown, where:

[0052] 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 2 As 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:

[0053] 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.

[0054] 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.

[0055] For the disc spring 50, its appearance is as follows Figure 5-6As 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 segment shown; and the disc spring 50 designed in the present invention focuses on the use of its overload failure and irreversible negative stiffness load characteristics during use, its H / h ≥ 3, the use range of its load displacement curve 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.

[0056] 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.

[0057] The method of using the pipe burst simulation assembly includes the following steps:

[0058] 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′;

[0059] 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;

[0060] 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.

[0061] Meanwhile, the test method of the fluid blocking test system using the damping check valve 100 includes the following steps:

[0062] 1) After the damping check valve 100 is reversely installed, 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. Then, the switch valve SV6 is opened to allow the water in the water storage container 120 to flow through the damping check valve 100 to determine that the damping check valve 100 is at 100% opening; thereafter, all valves in step 1) are closed;

[0063] 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, charge the pipeline where the damping check valve 100 is located with gas to the test pressure, open the regulating valve CV2 and the switch valve SV1, and charge the pressure regulating chamber of the burst pipe simulation component with high-pressure gas until the pressure is increased to the valve test pressure; close all valves in step 2) to maintain the test pressure value;

[0064] 3) Open the regulating valve CV2 and the switch valve SV1, and continue to fill the pressure regulating chamber of the pipe burst simulation component with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc rupture pressure, the bursting disc is opened and ruptured at the same time. The pressure in the pressure regulating chamber is released to atmospheric pressure. Under the action of the pressure difference, the crushed diaphragm is displaced, and the local plastic deformation at the ring groove is weakened. The crushed diaphragm ruptures, and the pipe burst condition occurs;

[0065] 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the damping check valve 100, 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 damping check valve 100 and the valve closing time.

[0066] 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.

[0067] 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.

[0068] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A single damping check valve fluid blocking test system, comprising a damping check valve (100) as a test object, characterized in that: The system further comprises a pipe burst simulation component, the inlet of the pipe burst simulation component is connected to the valve body inlet of the damping check valve (100), the valve body outlet of the damping check valve (100) is connected to the outlet of the accumulator (110) via a 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 an air source via a regulating valve CV1, and the liquid branch is connected to a water storage container (120) via a switch valve SV4, a water pump (140), and a switch valve SV3; the pressure regulating chamber of the pipe burst simulation component is connected to the air source via the switch valve SV1 and the regulating valve CV2 in sequence; the system further comprises 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, the other end of the bridging water path is connected to the outlet of the water pump, and a switch valve SV5 is arranged on the bridging water path; Pressure sensors are arranged at the valve body inlet and the valve body outlet of the damping check valve (100), and the system further comprises a displacement sensor for detecting the displacement of a valve disc in the damping check valve; The pipe burst simulation component comprises an outer pipe body (10) and a crushing diaphragm (20) located in the lumen of the outer pipe body (10), and the component further comprises a bursting disc (30), wherein 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 single damping check valve fluid blocking test system according to claim 1, characterized in that: The pressure regulating chamber is also connected to a pressure relief branch and a weighing branch. A pressure sensor P9 and a pressure relief valve are arranged on the pressure relief branch, and a switch valve SV8 and a weighing container (130) are arranged in sequence on the weighing branch. A weighing sensor for monitoring the weight of the weighing container (130) is arranged at the weighing container (130).

3. A single damping check valve fluid blocking test system according to claim 1, characterized in that: The valve body inlet of the damping check valve (100) is arranged with a pressure sensor P3 and a pressure sensor P4 in sequence, and the valve body outlet of the damping check valve (100) is arranged with a pressure sensor P2, a pressure sensor P1 and a temperature sensor T in sequence.

4. A single 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 single damping check valve fluid blocking test system according to claim 1, 2, 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 single 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 single 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 single 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 single 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 single 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 damping check valve (100) is installed in reverse, 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 is opened to allow the water in the water storage container (120) to flow through the damping check valve (100), so as to determine that the damping check valve (100) is 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 to charge the pipeline where the damping check valve (100) is located with gas to the test pressure, open the regulating valve CV2 and the switch valve SV1, and charge the pressure regulating chamber of the burst pipe simulation component with high-pressure gas until the pressure is increased to the valve test pressure; close all valves in step 2) to maintain the test pressure value; 3) Open the regulating valve CV2 and the switch valve SV1, and continue to fill the pressure regulating chamber of the burst pipe simulation component with high-pressure gas. When the pressure regulating chamber is pressurized to 1.2 times the test pressure, i.e., the bursting disc rupture pressure, the bursting disc is opened and ruptured at the same time. The pressure in the pressure regulating chamber is released to atmospheric pressure. Under the action of the pressure difference, the crushed diaphragm is displaced, and the local plastic deformation at the ring groove is weakened. The crushed diaphragm ruptures and the burst pipe condition occurs. 4) The data acquisition system collects and records the output data of the pressure sensors at the valve inlet and valve outlet of the damping check valve (100), 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 damping check valve (100) and the valve closing time.

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