A water pressure testing device

Abstract

This utility model discloses a hydrostatic testing device, comprising: a testing tube with a hydrostatic chamber inside; an exhaust valve disposed on the outer wall of the testing tube and communicating with the hydrostatic chamber; a plug plate sealed and fixedly connected to one end of the testing tube; a water inlet valve disposed on the plug plate and communicating with the hydrostatic chamber for injecting water into the hydrostatic chamber; a flange sealed and fixedly connected to the other end of the testing tube; an installation port provided on the flange; one end of the test piece being tested being installed into the hydrostatic chamber through the installation port; and a pressure plate sealed and fixedly connected to the flange to seal and fix the other end of the test piece. This utility model improves the accuracy, reliability, and efficiency of hydrostatic testing of instrument sleeves.

Description

Technical Field

[0001] This utility model relates to the technical field of water pressure testing equipment, and in particular to an instrument sleeve water pressure testing device. Background Technology

[0002] The reactor coolant pump (main nuclear pump) is a Class 1 nuclear safety device and the only active equipment in the primary loop of the nuclear island, often referred to as the "heart" of a nuclear power plant. To monitor the internal temperature and rotational speed of the main nuclear pump, instrument sleeves are installed and welded onto the pressure-bearing components. These instrument sleeves function as pressure-bearing components, and a separate hydrostatic test is required when replacing or maintaining them. The outer wall of the instrument sleeve is pressurized, and theoretically, according to standards, internal or external pressure tests can be performed to verify its pressure-bearing capacity. However, in practice, the small internal volume of the instrument sleeve makes pressure maintenance difficult, leading to inaccurate test results. Specifically, the small volume means that even small pressure changes during testing can significantly affect the results, increasing the uncertainty and error of the test.

[0003] Furthermore, the instrument bushing lacks an external hydrostatic connection interface, and its outer wall is typically welded to pressure-bearing components. While this connection method provides structural stability, it also presents significant challenges in connecting and sealing the instrument bushing during hydrostatic testing. These issues directly affect the accuracy and reliability of the instrument bushing's hydrostatic test, thereby posing a potential threat to the safe operation of the nuclear main pump. Utility Model Content

[0004] The purpose of this invention is to provide a hydrostatic testing device that improves the accuracy, reliability, and efficiency of hydrostatic testing of instrument sleeves without affecting their use.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A hydrostatic testing device includes: a testing tube with a hydrostatic chamber inside; an exhaust valve disposed on the outer wall of the testing tube and communicating with the hydrostatic chamber; a plug plate sealed and fixedly connected to one end of the testing tube; a water inlet valve disposed on the plug plate and communicating with the hydrostatic chamber for injecting water into the hydrostatic chamber; a flange sealed and fixedly connected to the other end of the testing tube; an installation port provided on the flange; one end of a test piece disposed in the hydrostatic chamber through the installation port; and a pressure plate sealed and fixedly connected to the flange to seal and fix the other end of the test piece.

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

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

[0009] Optionally, the length of the detection tube is greater than the length of the test piece.

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

[0011] Optionally, it further includes: a first pressure gauge and / or a second pressure gauge; the first pressure gauge is disposed on the pipeline where the inlet valve is located, between the plug plate and the inlet valve; the second pressure gauge is disposed on the pipeline where the vent valve is located, between the vent valve and the outer wall of the detection pipe; both the first pressure gauge and the second pressure gauge are 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, the flange mounting port has at least one sealing ring groove on its side wall, 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 test piece is an instrument sleeve.

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

[0016] This utility model has the following technical effects:

[0017] This utility model provides a water pressure testing device that can be used for the test piece, specifically for testing the external pressure of an instrument sleeve. This solves the problem that the internal volume of the instrument sleeve is very small, and if an internal pressure test is performed, the pressure fluctuation is obvious and it is difficult to maintain the pressure.

[0018] This invention uses a relatively long steel pipe as the water pressure chamber, which avoids the difficulty of maintaining pressure when the water pressure chamber is too small. Furthermore, the same water pressure testing device can be used for water pressure testing of various instrument sleeves of different lengths.

[0019] This invention enhances structural stability, simplifies installation and disassembly, improves pressure resistance, and increases testing efficiency and accuracy by welding the blocking plate, detection tube, and flange into a single unit.

[0020] This invention solves the sealing problem of the instrument sleeve during water pressure testing by setting a sealing ring on the flange mounting port to seal the outer wall of the instrument sleeve in the circumferential direction, ensuring no leakage during the test.

[0021] The instrument sleeve is axially fixed by a pressure plate to prevent it from detaching under water pressure. Circumferential constraints are provided by utilizing the mating dimensions between the flange mounting port (flange inner hole) and the outer wall of the instrument sleeve, resolving the fixing issue during the water pressure test and ensuring a safe and reliable connection. Furthermore, rubber gaskets are placed on the pressure plate to protect the instrument sleeve, preventing indentations on its end face and damage, thus having no adverse effect on the inner or outer surfaces of the sleeve and improving the safety and reliability of subsequent welding to pressure-bearing components. This effectively solves the fixing problem of the instrument sleeve during the water pressure test. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an instrument sleeve hydrostatic testing device provided in an embodiment of the present invention. Detailed Implementation

[0023] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the instrument sleeve hydrostatic testing device proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0024] like Figure 1 As shown, this embodiment provides a water pressure testing device, including: a detection tube 2, the detection tube 2 having a water pressure chamber inside; an exhaust valve 11, which is disposed on the outer wall of the detection tube 2 and communicates 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 disposed on the blocking plate 1 and communicates with the water pressure chamber for injecting water into the water pressure chamber; a flange 4, which is sealed and fixedly connected to the other end of the detection tube 2; an installation port is provided on the flange 4; one end of the test piece 3 is disposed in the water pressure chamber through the installation port; and a pressure plate 5, which is sealed and fixedly connected to the flange 4 to seal and fix the other end of the test piece 3.

[0025] This embodiment provides a water pressure testing device that can be used for the test piece, specifically for testing the external pressure of an instrument sleeve. This solves the problem that when the internal volume of the instrument sleeve is very small, the pressure fluctuates significantly and it is difficult to maintain the pressure during internal pressure testing.

[0026] In this embodiment, the detection tube 2 is a straight tube with a circular cross-section. The material of the detection tube 2 is steel pipe. Preferably, austenitic stainless steel can be selected, which ensures load-bearing capacity and reduces weight as much as possible, but this utility model is not limited thereto.

[0027] The air vent valve 11 is used to release the air in the water pressure chamber during the water pressure test, ensuring that the water pressure chamber is filled with water and avoiding the influence of gas on the water pressure test results.

[0028] It is understood that the specific location of the exhaust valve 11 can be reasonably selected based on the placement of the detection tube 2, and this utility model is not limited thereto. For example, as Figure 1 As shown, when the detection tube 2 is placed horizontally, the vent valve 11 is positioned above the detection tube 2 to indicate that the water pressure chamber of the detection tube 2 is full. Alternatively, when the detection tube 2 is placed vertically, the vent valve 11 can be positioned 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. In this embodiment, a longer steel pipe is selected as the water pressure chamber, which avoids the difficulty of maintaining pressure due to an insufficiently small water pressure chamber. Furthermore, the same water pressure testing device can be applied to water pressure tests of various instrument sleeves of different lengths, thus improving the versatility of the device.

[0030] In this embodiment, it also includes: a water-filling booster pump ( Figure 1 (Not shown in the image), connected to the inlet valve 14. Used to inject water into the water pressure chamber 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 disposed on the pipeline where the water inlet valve 14 is located, between the plug plate 1 and the water inlet valve 14; the second pressure gauge 13 is disposed on the pipeline where the air vent valve 11 is located, between the outer wall of the air vent valve 11 and the detection tube 2.

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

[0033] In this embodiment, please continue to refer to Figure 1As 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 installation and disassembly, improves pressure resistance, and enhances detection efficiency and accuracy by welding the blocking plate 1, detection tube 2, and flange 4 into a single unit.

[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 port of the flange 4, and a sealing ring 10 is provided in the sealing ring groove to circumferentially seal the outer side wall of the test piece 3 to prevent water from leaking from the gap between the test piece and the mounting port during the water pressure test.

[0035] This embodiment solves the sealing problem of the instrument sleeve during the water pressure test by setting a sealing ring 10 on the mounting port of flange 4 to seal the outer wall of the instrument sleeve in the circumferential direction, 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 sleeve.

[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 to the flange 4 is provided with a mounting groove, and a rubber pad 9 is provided in the mounting groove. The end of the test piece 3 is pressed onto the rubber pad 9. The pressure plate 5 and the flange 4 are fixedly connected by multiple fasteners. The setting of the pressure plate 5 realizes axial fixation of the instrument sleeve, preventing the instrument sleeve from coming out under water pressure; and the setting of the rubber pad 9 on the pressure plate 5 protects the instrument sleeve, preventing indentation on the end face of the instrument sleeve and damage to the sleeve. That is, it has no adverse effect on the inner and outer surfaces of the instrument sleeve, improves the safety and reliability of subsequent welding to pressure-bearing components, and solves the fixation problem of the instrument sleeve during water pressure test.

[0038] Multiple fasteners are used to securely connect the pressure plate 5 and the flange 4 to ensure a firm connection.

[0039] Please continue to refer to this. Figure 1 As shown, each of the fasteners includes: a stud or bolt 6, a nut 7, and a washer 8. Multiple mounting holes are provided circumferentially on the edge of the pressure plate 5 and the flange 4. The pressure plate 5 is mounted on the flange 4 by passing the stud 6 through the mounting hole and applying torque through the nut 7 and washer 8.

[0040] When performing a hydrostatic test on an instrument sleeve 3 (the instrument sleeve 3 can be an instrument sleeve with holes drilled and welded on a pressure-bearing component to monitor the internal temperature and speed of the main nuclear pump, or it can be other pipe fittings with small internal space that cannot be subjected to internal pressure testing; this utility model is not limited to these) using the aforementioned hydrostatic testing device, firstly, one end of the component to be tested, such as the instrument sleeve 3, is inserted into the hydrostatic chamber through the mounting port on the flange 4, and then the other end of the component to be tested is sealed and fixed with the pressure plate 5. Next, the inlet valve 14 and the vent valve 11 are opened, and the inlet valve 14 is connected to the water filling booster pump. The water filling booster pump is started to slowly fill the hydrostatic chamber with water. After water flows continuously out of the vent valve 11, the vent valve 11 is closed. The water filling booster pump is continued to increase the pressure in the hydrostatic chamber, and the readings of the two pressure gauges are observed. After the test pressure is reached, the inlet valve 14 is closed, and the pressure is maintained. During the pressurization process, the left end face of the instrument sleeve 3 will press against the pressure plate 5 after being subjected to water pressure.

[0041] After reaching the test pressure, maintain the pressure for a period of time, then remove the instrument sleeve. If there is no deformation or leakage, it is qualified and can be used. If there is deformation or leakage, it is unqualified.

[0042] This hydrostatic testing device has a simple structure and is easy to operate. It can effectively perform hydrostatic tests on instrument bushings and other test components to verify their sealing performance and pressure-bearing capacity, thereby improving testing efficiency and accuracy. This, in turn, improves the accuracy of monitoring the internal temperature and speed of the nuclear main pump, and enhances the maintenance efficiency of the instrument bushings on the nuclear main pump.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] In the description of this utility model, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the 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 should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A hydrostatic testing apparatus characterized by, include: The detection tube has a water pressure chamber inside. An exhaust valve is provided on the outer wall of the detection tube and communicates with the water pressure chamber; A sealing plate is fixedly connected to one end of the detection tube in a sealed manner. An inlet valve is disposed on the blockage plate and communicates with the water pressure chamber, for injecting water into the water pressure chamber; A flange is sealed and fixedly connected to the other end of the detection tube; an installation port is provided on the flange. One end of the test piece is positioned into the hydraulic chamber through the mounting port; A pressure plate is connected to the flange in a sealing manner to seal and fix the other end of the test piece.

2. The hydrostatic testing apparatus of claim 1, wherein, The detection tube is a straight tube.

3. The hydrostatic testing apparatus of claim 1, wherein, The testing tube is a steel pipe.

4. The hydrostatic testing apparatus of claim 1, wherein, The length of the detection tube is greater than the length of the test piece.

5. The hydrostatic testing apparatus of claim 1, wherein, Also includes: A water-filling booster pump is connected to the water inlet valve.

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

7. The hydrostatic testing apparatus of claim 1, wherein, The blocking plate and the flange are respectively welded to the ends of the detection tube.

8. The hydrostatic testing apparatus of claim 1, wherein, The flange mounting port has at least one sealing ring groove on its side wall, and a sealing ring is provided in the sealing ring groove to circumferentially seal the outer side wall of the test piece.

9. The hydrostatic testing apparatus of claim 1, wherein, The device under test is an instrument sleeve.

10. The hydrostatic testing apparatus of claim 1, wherein, The mounting surface of the pressure plate opposite to the flange is provided with a mounting groove, and a rubber pad is provided in the mounting groove. The end of the test piece is pressed onto the rubber pad. The pressure plate and the flange are fixedly connected by multiple fasteners.

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