Hydrostatic test device

Abstract

The invention discloses a water pressure test device, which comprises a detection pipe, a water pressure test device and a water pressure test device, the exhaust valve is arranged on the outer side wall of the detection pipe and is communicated with the water pressure chamber; the blocking plate is hermetically and fixedly connected with one end of the detection tube; the water inlet valve is arranged on the blocking plate, communicates with the interior of the water pressure cavity and is used for injecting water into the water pressure cavity; the flange is hermetically and fixedly connected with the other end of the detection pipe; a mounting opening is formed in the flange; one end of the to-be-tested piece is arranged in the water pressure chamber through the mounting port; and the pressing plate is in sealing connection with the flange to seal and fix the other end of the to-be-tested piece. According to the invention, the accuracy, reliability and efficiency of the instrument casing water pressure test are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water pressure testing equipment, in particular to an instrument casing water pressure testing device. Background Art

[0002] The reactor coolant pump (nuclear main pump) is a first-level nuclear safety device and the only active equipment in the primary circuit of the nuclear island. It is known as the "heart" of a nuclear power plant. In order to monitor the internal temperature and speed of the nuclear main pump, a hole is opened on the pressure-bearing component and an instrument sleeve is welded. The instrument sleeve functions as a pressure-bearing component and needs to be subjected to a separate water pressure test when replacing or maintaining the instrument sleeve. The outer wall of the instrument sleeve is under pressure. According to standard requirements, internal or external pressure tests can theoretically be carried out to test its pressure-bearing performance. However, in actual operation, due to the small internal volume of the instrument sleeve, this feature is not conducive to maintaining pressure, resulting in inaccurate test results. Specifically, the small volume means that during the test, even small pressure changes may have a significant impact on the test results, increasing the uncertainty and error of the test.

[0003] Furthermore, the instrument casing lacks an external hydraulic connection port, and the outer wall of the instrument casing typically needs to be welded to the pressure-bearing component. While this connection method provides structural stability, it also creates significant inconvenience in connecting and sealing the instrument casing during a separate hydrostatic test. These issues directly impact the accuracy and reliability of the instrument casing hydrostatic test, posing a potential threat to the safe operation of the nuclear main pump. Summary of the Invention

[0004] The object of the present invention is to provide a water pressure test device, which can improve the accuracy, reliability and efficiency of the water pressure test of the instrument casing without affecting the use of the instrument casing.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A water pressure testing device comprises: a detection tube, wherein a water pressure chamber is provided inside the detection tube; an exhaust valve, which is arranged on the outer wall of the detection tube and is connected to the water pressure chamber; a blocking plate, which is sealed and fixedly connected to one end of the detection tube; a water inlet valve, which is arranged on the blocking plate and is connected to the water pressure chamber and is used to inject water into the water pressure chamber; a flange, which is sealed and fixedly connected to the other end of the detection tube; a mounting port is provided on the flange; one end of the part to be tested is arranged in the water pressure chamber through the mounting port; and a pressure plate, which is sealed and connected to the flange to seal and fix the other end of the part to be tested.

[0007] Optionally, the detection tube is a straight tube.

[0008] Optionally, the detection tube is a steel tube.

[0009] Optionally, the length of the detection tube is greater than the length of the object to be tested.

[0010] Optionally, it further includes: a water filling booster pump connected to the water inlet valve.

[0011] Optionally, it also includes: a first pressure gauge and / or a second pressure gauge; the first pressure gauge is arranged on the pipeline where the water inlet valve is located, between the blocking plate and the water inlet valve; the second pressure gauge is arranged on the pipeline where the exhaust valve is located, between the exhaust valve and the outer wall of the detection tube; the first pressure gauge and the second pressure gauge are both used to detect the water pressure in the water pressure chamber.

[0012] Optionally, the blocking plate and the flange are respectively welded to the ends of the detection tube.

[0013] Optionally, at least one sealing ring groove is provided on the side wall of the mounting opening of the flange, and a sealing ring is provided in the sealing ring groove to circumferentially seal the outer side wall of the test piece.

[0014] Optionally, the piece to be tested is an instrument casing.

[0015] Optionally, a mounting groove is provided on the mounting surface of the pressure plate opposite to the flange, a rubber pad is provided in the mounting groove, and the end of the test piece is pressed onto the rubber pad; the pressure plate and the flange are fixedly connected by multiple fixing members.

[0016] The present invention has the following technical effects:

[0017] The present invention provides a water pressure test device that can be used to perform external pressure testing on a test piece, specifically an instrument casing, thereby solving the problem that the internal volume of the instrument casing is very small, and when performing an internal pressure test, the pressure fluctuates significantly and it is difficult to maintain pressure.

[0018] The present invention selects a longer steel pipe as the hydraulic chamber, which can avoid the difficulty of maintaining pressure when the hydraulic chamber is too small, and the same hydraulic test device can be applied to hydraulic tests of instrument casings of different lengths.

[0019] The present invention enhances structural stability, simplifies installation and disassembly processes, improves pressure bearing capacity, and enhances detection efficiency and accuracy by welding the blocking plate, detection tube and flange into a whole.

[0020] The present invention provides a sealing ring on the installation opening of the flange to seal the outer wall of the instrument casing in the circumferential direction, thereby solving the sealing problem of the instrument casing during the water pressure test and ensuring no leakage during the test.

[0021] The instrument casing is fixed axially by a pressure plate to prevent it from falling out under water pressure. The matching dimensions of the flange mounting opening (flange inner hole) and the outer wall of the instrument casing are used for circumferential constraint, solving the problem of fixing the instrument casing during the water pressure test and ensuring a safe and reliable connection. A rubber pad is also provided on the pressure plate to protect the instrument casing, preventing indentations on the end face of the instrument casing and damage to the casing. This has no adverse effect on the inner and outer surfaces of the instrument casing, improving the safety and reliability of subsequent welding to the pressure-bearing component. This solves the problem of fixing the instrument casing during the water pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention provides a schematic structural diagram of an instrument casing water pressure test device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is a further detailed description of an instrument casing water pressure test device proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the drawings are in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they have no technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0024] like Figure 1 As shown, this embodiment provides a water pressure testing device, including: a detection tube 2, wherein a water pressure chamber is provided inside the detection tube 2; an exhaust valve 11, which is arranged on the outer wall of the detection tube 2 and communicated with the water pressure chamber; a blocking plate 1, which is sealed and fixedly connected to one end of the detection tube 2; a water inlet valve 14, which is arranged on the blocking plate 1 and communicated with the water pressure chamber, and is used to inject water into the water pressure chamber; a flange 4, which is sealed and fixedly connected to the other end of the detection tube 2; a mounting port is opened on the flange 4; one end of the test piece 3 is set in the water pressure chamber through the mounting port; and a pressure plate 5, which is sealed and connected to the flange 4 to seal and fix the other end of the test piece 3.

[0025] The present embodiment provides a water pressure test device that can be used to perform external pressure testing on a test piece, specifically an instrument casing, thereby solving the problem that the internal volume of the instrument casing is very small, and when performing an internal pressure test, the pressure fluctuates significantly and it is difficult to maintain pressure.

[0026] In this embodiment, the detection tube 2 is a straight tube with a circular cross-section. The detection tube 2 is made of a steel tube. Preferably, austenitic stainless steel can be selected to ensure load-bearing capacity while minimizing weight, but the present invention is not limited thereto.

[0027] The exhaust valve 11 is used to exhaust the air in the hydraulic chamber during the hydraulic test to ensure that the hydraulic chamber is filled with water and to avoid the influence of gas on the hydraulic test results.

[0028] It is understandable that the specific location of the exhaust valve 11 can be reasonably selected according to the placement of the detection tube 2, and the present invention is not limited thereto. Figure 1 As shown, when the detection tube 2 is placed horizontally, the exhaust valve 11 is set above the detection tube 2 to know that the water pressure chamber of the detection tube 2 is full. Alternatively, when the detection tube 2 is placed vertically, the exhaust valve 11 can be set at the same end as the water inlet valve 14.

[0029] In this embodiment, please continue to refer to Figure 1 As shown, the length of the detection tube 2 is greater than the length of the test piece 3. This embodiment uses a longer steel tube as the hydraulic chamber to avoid the difficulty of maintaining pressure when the hydraulic chamber is too small. Furthermore, the same hydraulic test device can be used for hydraulic tests on a variety of instrument casings of different lengths, improving the versatility of the device.

[0030] In this embodiment, it also includes: a water filling booster pump ( Figure 1 1 ), is connected to the water inlet valve 14. It is used to inject water into the water pressure chamber through the water inlet valve 14 and provide the required water pressure during the test.

[0031] In this embodiment, please continue to refer to Figure 1 As shown, it also includes: a first pressure gauge 12 and / or a second pressure gauge 13; the first pressure gauge 12 is arranged on the pipeline where the water inlet valve 14 is located, and is located between the blocking plate 1 and the water inlet valve 14; the second pressure gauge 13 is arranged on the pipeline where the exhaust valve 11 is located, and is located between the exhaust valve 11 and the outer wall of the detection tube 2.

[0032] The first pressure gauge 12 and the second pressure gauge 13 are of redundant design and can verify each other. Both are used to display the water pressure in the water pressure chamber.

[0033] In this embodiment, please continue to refer to Figure 1 As shown, the blocking plate 1 and the flange 4 are respectively welded to the ends of the detection tube 2. This embodiment enhances structural stability, simplifies the installation and disassembly process, improves pressure bearing capacity, and enhances detection efficiency and accuracy by welding the blocking plate 1, detection tube 2, and flange 4 into a whole.

[0034] In this embodiment, please continue to refer to Figure 1 As shown, at least one sealing ring groove is provided on the side wall of the mounting opening of the flange 4, and a sealing ring 10 is provided in the sealing ring groove to circumferentially seal the outer wall of the test piece 3 to prevent water from leaking from the gap between the test piece and the mounting opening during the water pressure test.

[0035] In this embodiment, a sealing ring 10 is provided on the mounting opening of the flange 4 to seal the outer wall of the instrument casing in the circumferential direction, thereby solving the sealing problem of the instrument casing during the water pressure test and ensuring no leakage during the test.

[0036] In this embodiment, please continue to refer to Figure 1 As shown, the test piece 3 is an instrument casing.

[0037] In this embodiment, please continue to refer to Figure 1 As shown, the mounting surface (or contact surface) of the pressure plate 5 opposite the flange 4 is provided with a mounting groove, in which a rubber pad 9 is provided. The end of the test piece 3 is crimped onto the rubber pad 9. The pressure plate 5 and the flange 4 are fixedly connected using multiple fixings. The provision of the pressure plate 5 axially fixes the instrument casing to prevent it from falling out under water pressure. The rubber pad 9 is also provided on the pressure plate 5 to protect the instrument casing and prevent indentations on the end surface of the instrument casing, which could damage the casing. This has no adverse effect on the inner and outer surfaces of the instrument casing, improves the safety and reliability of subsequent welding to the pressure-bearing component, and solves the problem of fixing the instrument casing during the water pressure test.

[0038] The pressure plate 5 and the flange 4 are fixedly connected by multiple fixings to ensure the firmness of the connection.

[0039] Please continue to refer to Figure 1 As shown, each of the fixing parts includes: a stud or bolt 6, a nut 7 and a gasket 8. A plurality of mounting holes are provided on the edges of the pressure plate 5 and the flange 4 at intervals along the circumferential direction. The stud 6 is passed through the mounting hole and torque is applied through the nut 7 and the gasket 8 to mount the pressure plate 5 on the flange 4.

[0040] When using the aforementioned hydraulic pressure test apparatus to perform a hydraulic pressure test on an instrument sleeve 3 (the instrument sleeve 3 can be a welded, hole-punched instrument sleeve in a pressure-bearing component designed to monitor the internal temperature and rotational speed of a nuclear main pump, or it can be other pipes with a smaller internal space that cannot withstand internal pressure testing, but the present invention is not limited thereto), first, one end of the test piece, such as the instrument sleeve 3, is inserted into the hydraulic pressure chamber through the mounting opening on the flange 4. The other end of the test piece is then sealed and secured with a pressure plate 5. Next, the inlet valve 14 and the outlet valve 11 are opened, and the inlet valve 14 is connected to a water-filling booster pump. The water-filling booster pump is started to slowly fill the hydraulic pressure chamber with water. After water continuously flows out of the outlet valve 11, the outlet valve 11 is closed. The water-filling booster pump is continued to increase the pressure in the hydraulic pressure chamber, and the readings of the two pressure gauges are observed. Once the test pressure is reached, the inlet valve 14 is closed to maintain the pressure. During the pressure increase, the left end face of the instrument sleeve 3, under the influence of the water pressure, presses against the pressure plate 5.

[0041] When the test pressure is reached and the pressure is maintained for a period of time, the instrument casing is removed. If there is no deformation or leakage, it is qualified and can be used. If there is deformation or leakage, it is unqualified.

[0042] The hydrostatic test device has a simple structure and is easy to operate. It can effectively perform hydrostatic tests on instrument casings, verifying their sealing performance and pressure-bearing capacity, and improving testing efficiency and accuracy. This can further improve the accuracy of monitoring the internal temperature and speed of nuclear main pumps, as well as enhance the maintenance efficiency of instrument casings on nuclear main pumps.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0044] In the description of the present invention, it should be understood that the terms "center," "height," "thickness," "up," "down," "vertical," "horizontal," "top," "bottom," "inside," "outside," "axial," "radial," "circumferential," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0046] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A water pressure testing device, characterized in that: include: A detection tube, wherein a water pressure chamber is provided inside the detection tube; an exhaust valve, which is provided on the outer side wall of the detection tube and communicates with the water pressure chamber; a blocking plate, sealed and fixedly connected to one end of the detection tube; a water inlet valve, which is arranged on the blocking plate and communicated with the water pressure chamber, and is used to inject water into the water pressure chamber; A flange is sealed and fixedly connected to the other end of the detection tube; the flange is provided with a mounting opening; One end of the test piece is placed in the water pressure chamber through the mounting opening; A pressing plate is sealed and connected to the flange to seal and fix the other end of the test piece.

2. The water pressure testing device according to claim 1, characterized in that: The detection tube is a straight tube.

3. The water pressure testing device according to claim 1, characterized in that: The detection tube is a steel tube.

4. The water pressure testing device according to claim 1, characterized in that: The length of the detection tube is greater than the length of the test piece.

5. The water pressure testing device according to claim 1, characterized in that: Also includes: A water filling booster pump is connected to the water inlet valve.

6. The water pressure testing device according to claim 1, wherein: Also includes: A first pressure gauge and / or a second pressure gauge; the first pressure gauge is arranged on the pipeline where the water inlet valve is located, and is located between the blocking plate and the water inlet valve; The second pressure gauge is arranged on the pipeline where the exhaust valve is located, and is located between the exhaust valve and the outer wall of the detection tube; The first pressure gauge and the second pressure gauge are both used to detect the water pressure in the water pressure chamber.

7. The water pressure testing device according to claim 1, wherein: The blocking plate and the flange are respectively welded to the ends of the detection tube.

8. The water pressure testing device according to claim 1, wherein: At least one sealing ring groove is provided on the side wall of the mounting opening of the flange, and a sealing ring is provided in the sealing ring groove to circumferentially seal the outer wall of the test piece.

9. The water pressure testing device according to claim 1, wherein: The piece to be tested is an instrument casing.

10. The water pressure testing device according to claim 1, wherein: The mounting surface of the pressing plate opposite to the flange is provided with a mounting groove, a rubber pad is provided in the mounting groove, and the end of the test piece is pressed on the rubber pad; the pressing plate and the flange are fixedly connected by multiple fixing members.

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