Diaphragm water pressure resistance test device

Abstract

The utility model provides a diaphragm water pressure resistance test device. The diaphragm water pressure resistance test device comprises a base, a pressure cavity, an upper pressing plate and a sealing system, the pressure cavity is fixed to the base through base connecting bolts, and the upper pressing plate is installed on the top of the pressure cavity through fastening bolts. The sample clamping surface of the pressure cavity is provided with a convex V-shaped groove, the sample clamping surface of the upper pressing plate is provided with a concave V-shaped groove, and the convex V-shaped groove and the concave V-shaped groove form a concave-convex combined clamping structure with a gap of 0.3-0.6 mm; a through test hole is formed in the center of the upper end of the pressure cavity, and a through hole correspondingly communicated with the test hole is formed in the upper pressing plate; and a liquid inlet and a liquid outlet are formed in the pressure cavity. According to the device disclosed by the utility model, the direct measurement of the compression strength data of the nuclear-grade diaphragm is realized by accurately matching the clamping gap, optimizing the fluid channel and strengthening the sealing, the test deviation rate is less than or equal to 5 percent, and the safety detection requirement under the high-pressure working condition of 30-50MPa is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rubber tightness test device technical field, concretely relates to a diaphragm water pressure test device. BACKGROUND

[0002] In the rubber plastic product industry, water pressure resistance performance detection is an important quality guarantee link of the localization promotion of the diaphragm for the key valve of the nuclear power station. The existing technology generally adopts the hydraulic method specified in GB / T 20027.2 standard to determine the rupture strength, the device realizes testing by pressing the inner side of the rubber film, and there are significant technical limitations: first, due to the existence of the barrier film, the sample cannot directly contact the water pressure medium, resulting in indirect conversion error of the rupture strength data; second, the double V groove structure required by the standard is easy to produce sample displacement under high pressure environment, affecting the testing accuracy; third, the traditional tooling lacks safety reinforcement structure and visual design, and there is a safety hazard under the working condition that the test pressure exceeds 30MPa.

[0003] It is particularly worth pointing out that the nuclear-grade diaphragm, as the core component of water flow control in the nuclear power station, its pressure resistance performance is directly related to the safety of the nuclear reactor operation. The existing detection method adopts an indirect testing method, which is difficult to accurately reflect the failure critical point of the diaphragm under real working conditions, and the sealing performance of the traditional tooling is insufficient, which easily leads to pressure leakage, causing serious data deviation. This has become the main technical bottleneck restricting the localization process of nuclear-grade sealing materials. SUMMARY

[0004] The utility model provides a diaphragm water pressure test device, solves the technical problem in the prior art that the test device sample displacement deviation is large, the sealing performance is insufficient, leading to inaccurate water pressure test data and high pressure working condition safety hazard.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A diaphragm water pressure test device, characterized in that it comprises a base, a pressure cavity, an upper pressing plate and a sealing system; the pressure cavity is fixed on the base by base connecting bolts, and the upper pressing plate is installed on the top of the pressure cavity by fastening bolts; the sample clamping surface of the pressure cavity is provided with a convex V-shaped groove, and the sample clamping surface of the upper pressing plate is provided with a concave V-shaped groove, which forms a concave-convex combined clamping structure with a gap of 0.3-0.6mm; a test hole is formed in the center of the upper end of the pressure cavity, and a through hole corresponding to the test hole is formed in the upper pressing plate; a liquid inlet and a liquid outlet are arranged on the pressure cavity.

[0007] Further, the sealing system comprises a sealing ring arranged between the pressure cavity and the base, and the sealing ring is made of fluorine rubber and has a rectangular or circular cross-sectional shape.

[0008] Further, the test hole of the pressure cavity has a hole diameter of 10-15mm, and the hole edge is provided with a fillet with a radius of 1mm.

[0009] Further, a manual pressure pump quick connector is arranged on the liquid inlet, and a ball valve is connected to the liquid outlet.

[0010] Further, the base is provided with at least four anchor bolt holes and is fixed to the experiment table by expansion bolts, and the bottom surface of the base is provided with anti-skid lines.

[0011] Further, the sample contact surface of the pressure cavity has a descending surface structure, and the surface roughness of the sample contact surface of the pressure cavity is less than or equal to 1.6μm.

[0012] Further, a pressure gauge is mounted on the side wall of the pressure cavity, the range of the pressure gauge is 0-50MPa, and the accuracy level is 0.5 level.

[0013] Further, the included angle of the convex V-shaped groove and the concave V-shaped groove is 60°, and the groove depth is 2-3mm.

[0014] Further, the inner chamfer structure is arranged at the through hole entrance of the upper pressing plate, and the inner chamfer angle is 30°±2°.

[0015] Further, the convex V-shaped groove and the concave V-shaped groove are uniformly distributed in three rows along the clamping surface.

[0016] Compared with the prior art, the utility model has the advantages of the following:

[0017] The utility model discloses a structure optimization significantly improves the accuracy and safety of the nuclear grade diaphragm water pressure test: the V-shaped groove structure of concave-convex combination effectively inhibits the radial displacement of the sample under high pressure, compared with the traditional double V groove structure, the sample slip amount reduces about 70%, and the authenticity of the water pressure data acquisition when breaking the test is ensured;The design of fluorine rubber sealing ring between the pressure cavity and the base combines the uniform pressure exerting characteristic of the descending surface structure, and under the working condition of 30MPa, the leakage rate is less than 0.01mL / min, so that the test result deviation rate is reduced from 15% of the prior art to within 5%;The water pressure change real-time monitoring is realized by the through type test hole and the 0.5 level precision pressure gauge, the diaphragm breaking critical point can be accurately captured, and the data delay is shortened to within 1 second;The base reinforcement device and the anti-skid line design can bear 40MPa sudden pressure impact, cooperate with the large chamfer structure of the pressing plate, so that the operator can safely observe the sample state from 1.5 meters away, and the high-pressure liquid injection risk is fundamentally eliminated.

[0018] Of course, implementing each technical scheme of the utility model does not necessarily need to achieve all the advantages mentioned above. DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0020] Figure 1 It is a structure schematic diagram of the diaphragm water pressure test device of the embodiment 2 of the present application.

[0021] Figure 2 It is a structure enlarged view of the sample clamping surface of the embodiment 2 of the present application.

[0022] In the figure, 1 is a base, 2 is a base link bolt, 3 is a pressure cavity, 4 is a liquid inlet, 5 is an upper pressing plate, 6 is an upper pressing plate fastening bolt, 7 is a sealing ring, 8 is a liquid outlet, and 9 is a pressure gauge. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more comprehensive and comprehensive.

[0024] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Meanwhile, in the description of the utility model, the terms "first", "second" and the like are merely used to distinguish description, and cannot be understood as indicating or implying relative importance. Of course, such objects can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0027] Embodiment 1:

[0028] The embodiment provides a diaphragm water pressure test device, which comprises a base, a pressure cavity, an upper pressing plate and a sealing system; the pressure cavity is fixed on the base through a base connecting bolt; the upper pressing plate is installed on the top of the pressure cavity through a fastening bolt; the sample clamping surface of the pressure cavity is provided with a convex V-shaped groove, and the sample clamping surface of the upper pressing plate is provided with a concave V-shaped groove, and the two form a concave-convex combined clamping structure with a gap of 0.3-0.6 mm; a test hole penetrating through the center of the upper end of the pressure cavity is arranged, and a through hole penetrating through the test hole is arranged on the upper pressing plate; a liquid inlet and a liquid outlet are arranged on the pressure cavity.

[0029] The base is made of integrally cast 304 stainless steel material, the bottom surface is designed with a rhombic anti-skid line, the anti-skid line has a depth of 1.5 mm±0.2 mm, and the base is rigidly connected with the experimental table surface through foundation bolts, so that the stability of the device in high-pressure testing is enhanced.

[0030] The pressure cavity and the base are fixed through annularly distributed connecting bolts, and the combination surface of the two is embedded with a sealing ring made of fluorine rubber material, so that a multilayer sealing structure is formed.

[0031] The sample clamping surface is treated by a precision grinding process, and has a surface roughness Ra≤1.6 μm and high surface smoothness, so that the uniform stress of the sample can be ensured.

[0032] The convex V-shaped groove and the concave V-shaped groove of the upper pressing plate are embedded with each other, the included angle between the convex V-shaped groove and the concave V-shaped groove of the upper pressing plate is 60°±1°, the groove depth is 2-3 mm, a staggered occlusion structure is formed, and the radial sliding of the sample under high pressure is effectively inhibited.

[0033] The test hole in the center of the pressure cavity and the through hole of the upper pressing plate are coaxially penetrated, the hole diameter of the test hole is 10-15 mm, and the hole edge round angle is R1 mm, so that the water pressure medium can directly act on the surface of the sample.

[0034] The liquid inlet is provided with a quick connector, the convenient connection of a manual pressure pump is supported, and the ball valve design of the liquid outlet can realize rapid pressure relief after testing.

[0035] The high-precision pressure gauge installed on the side wall can display the pressure change inside the cavity in real time, and the operator can judge the pressure resistance performance of the diaphragm by observing the pressure fluctuation trend.

[0036] The embodiment significantly reduces the test error caused by sample displacement or leakage of traditional tooling through the optimized clamping structure and sealing system.

[0037] Embodiment 2:

[0038] Referring to Figure 1 On the basis of Embodiment 1, the stress distribution design of the clamping surface is further optimized in this embodiment.

[0039] Specifically, the sample clamping surface of the pressure cavity 3 is uniformly distributed with three convex V-shaped grooves along the circumference, forming a multi-point clamping structure. This design can disperse the local stress concentration under high pressure and avoid premature rupture of the sample edge caused by uneven stress, as shown in Figure 2 The through-hole entrance of the upper pressing plate 5 adopts a chamfer design, and the inner wall is provided with a hard plating layer to cope with long-term high-pressure water flow erosion.

[0040] The sealing system adopts a fluororubber sealing ring 7 with a rectangular cross section, which is precisely matched with the sealing groove in size, and can still maintain good elasticity after repeated disassembly. The anti-skid pattern of the base 1 is improved to be wavy, increasing the friction force with the experimental bench surface and further suppressing the device vibration during high-pressure testing. During the testing process, the operator can safely observe the sample state through the large chamfer design of the pressing plate, avoiding close contact with the high-pressure area. This embodiment is particularly suitable for long-period durability testing of nuclear power plant diaphragms, and the structural design takes into account both testing accuracy and operational safety.

[0041] The experimental steps of this embodiment are as follows:

[0042] Tooling fixation: fix the base 1 to the experimental bench surface through the anchor bolt to ensure that the anti-skid pattern is fully attached to the bench surface;

[0043] Sealing assembly: correctly place the fluororubber sealing ring 7 in the sealing groove of the pressure cavity 3, and tighten the connecting bolts step by step to the specified torque;

[0044] Sample installation: lay the diaphragm sample to be tested on the clamping surface of the pressure cavity 3, and then lock the tightening bolts step by step in the cross-intersection order after placing the upper pressing plate 5;

[0045] Pressure establishment: connect the manual pressure pump to the liquid inlet 4, open the ball valve of the liquid outlet 8 to discharge air, close the ball valve after the water flow is stable, and slowly pressurize to the test value;

[0046] State monitoring: observe the pressure change through the pressure gauge 9, and remotely observe the surface deformation of the sample;

[0047] Data recording: when the sample appears visible rupture, immediately record the peak pressure value and close the pressurizing system;

[0048] Safety pressure relief: rotate the ball valve handle counterclockwise to the full open position, and after the pressure is zero, disassemble the sample and clean the test cavity.

[0049] Through experimental verification, the embodiment significantly improves the accuracy and safety of the water pressure test of the nuclear-grade diaphragm through structural optimization: the V-shaped groove structure combined with concave and convex effectively inhibits the radial displacement of the sample under high pressure, compared with the traditional double-V groove structure, the sample slip amount is reduced by about 70%, ensuring the authenticity of the water pressure data collection during the rupture test; the design of fluorine rubber sealing ring between the pressure cavity and the base, combined with the uniform pressure characteristics of the descending surface structure, the leakage rate is less than 0.01 mL / min under the condition of 30MPa, the test result deviation rate is reduced from 15% of the prior art to within 5%; the through test hole cooperates with the 0.5 level precision pressure gauge to realize real-time monitoring of the water pressure change, which can accurately capture the critical point of diaphragm rupture, and the data delay is shortened to within 1 second; the base reinforcing device and the anti-skid pattern design can withstand the impact of 40MPa sudden pressure, cooperating with the large chamfer structure of the pressure plate, so that the operator can safely observe the sample state from 1.5 meters away, fundamentally eliminating the risk of high-pressure liquid injection.

[0050] The above uses specific examples to describe the utility model, which is only used to help understand the utility model and does not limit the utility model. For those skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A diaphragm water pressure resistance testing device, characterized in that, The device includes a base (1), a pressure chamber (3), an upper pressure plate (5), and a sealing system. The pressure chamber (3) is fixed to the base (1) by a base connecting bolt (2), and the upper pressure plate (5) is installed on the top of the pressure chamber (3) by a fastening bolt (6). The sample clamping surface of the pressure chamber (3) is provided with a raised V-shaped groove, and the sample clamping surface of the upper pressure plate (5) is provided with a recessed V-shaped groove, forming a concave-convex clamping structure with a gap of 0.3-0.6mm. The pressure chamber (3) has a through test hole at the center of its upper end, and the upper pressure plate (5) has a through hole corresponding to the test hole. The pressure chamber (3) has an inlet (4) and an outlet (8).

2. The apparatus according to claim 1, characterized in that, The sealing system includes a sealing ring (7) disposed between the pressure chamber (3) and the base (1). The sealing ring (7) is made of fluororubber and has a rectangular or circular cross-sectional shape.

3. The apparatus according to claim 1, characterized in that, The test hole of the pressure chamber (3) has a diameter of 10-15 mm and a rounded corner with a radius of 1 mm at the edge.

4. The apparatus according to claim 1, characterized in that, The inlet (4) is equipped with a quick-connect fitting for a manual pressure pump; the outlet (8) is connected to a ball valve.

5. The apparatus according to claim 1, characterized in that, The base (1) is provided with at least four anchor bolt holes and is fixed to the experimental table surface by expansion bolts. The bottom surface of the base (1) is provided with anti-slip texture.

6. The apparatus according to claim 1, characterized in that, The sample contact surface of the pressure chamber (3) is a downward surface structure, and the surface roughness Ra of the sample contact surface of the pressure chamber (3) is ≤1.6μm.

7. The apparatus according to claim 1, characterized in that, The pressure chamber (3) is equipped with a pressure gauge (9) on its side wall. The gauge has a range of 0-50 MPa and an accuracy class of 0.

5.

8. The apparatus according to claim 1, characterized in that, The included angle between the raised V-groove and the recessed V-groove is 60°, and the groove depth is 2-3mm.

9. The apparatus according to claim 1, characterized in that, The upper pressure plate (5) has an inner chamfered structure at the through hole inlet, with an inner chamfer angle of 30°±2°.

10. The apparatus according to claim 8, characterized in that, The raised V-groove and the recessed V-groove are evenly distributed in three rows along the circumference of the clamping surface.

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