A high pressure water pressure detection system

Abstract

The application relates to the technical field of sealing detection, and particularly discloses a high-pressure water pressure detection system, which comprises a host computer, a water outlet pipe connected to a water outlet on the side of the host computer, and a connecting device arranged at the end of the water outlet pipe and used for connecting a water inlet end of a measured piece, characterized in that the connecting device comprises: a mounting pipe, the end of which is connected to the water outlet pipe; an elastic sleeve, the end of which is sealingly connected to the front end of the mounting pipe; a supporting piece arranged in the elastic sleeve and used for supporting the elastic sleeve to keep a cylindrical shape; and a stretching assembly used for stretching the supporting piece to stretch the elastic sleeve, changing the diameter of the elastic sleeve, and making the elastic sleeve adhere to the inner wall of the water inlet end of the measured piece; after being driven by the stretching assembly, the supporting piece generates a radial expansion force from inside to outside, directly pushes the external elastic sleeve to expand synchronously, and then makes the outer wall of the elastic sleeve tightly adhere to the inner wall of the water inlet end of the measured piece.

Description

Technical Field

[0001] This invention relates to the field of sealing testing technology, and more specifically to a high-pressure water pressure testing system. Background Technology

[0002] In the fluid equipment manufacturing and pipe fitting inspection industry, high-pressure water pressure testing systems play an important role. They are essential key equipment for testing the pressure resistance and sealing performance of products such as pipelines, valves, and pressure vessels. However, when connecting and sealing the test pipeline with the water inlet end of the tested component, there are common safety and stability issues such as difficulty in blind insertion and alignment, easy breakage of purely flexible seals under high pressure, and the backlash force of high-pressure water flow causing the sealing mechanism to retract. Therefore, it is necessary to improve the system by incorporating technical means such as automatic centering guidance, skeleton support expansion, and mechanical locking to prevent retraction.

[0003] Existing technology, such as the Chinese authorized invention patent CN112683469B, provides a sealing performance testing device, including a fixture, a pressing module, and a sealing performance testing instrument. The fixture is used to hold the test material; the pressing module can move closer to and further away from the test material, and an air hole is provided on the side of the pressing module closest to the test material. The pressing module presses the test material tightly, forming a first sealing cavity between them, with the air hole communicating with the first sealing cavity; the sealing performance testing instrument is used to detect the air pressure in the first sealing cavity. When the air tightness of the test material needs to be tested, the test material is first manually placed on the fixture, and then the first sealing cavity is inflated through the air hole. After inflation is completed and maintained for a certain period of time, the sealing performance testing instrument starts to detect the air pressure in the first sealing cavity at preset time points and compares it with a standard value. The testing personnel can quickly determine the air tightness of the test material by observing the changes in air pressure within the first sealing cavity; the testing speed is fast and the accuracy is high.

[0004] The existing solution has the following specific defects: First, the test connector lacks a guiding and self-centering mechanism when inserted into the water inlet of the test piece. Blind insertion can easily cause jamming and scratches on the inner wall of the water inlet, and can also cause the installation pipe to be in an off-center position, resulting in uneven stress on all sides during subsequent expansion and weak points where the seal is not tight. Second, the existing expansion seals mostly rely on the physical compression deformation of pure rubber material without internal support. When subjected to extreme high-pressure water flow, the flexible material cannot effectively resist radial pressure, which can easily cause water to leak from the tiny gaps in the mating surface. Third, when the existing extrusion drive mechanism is subjected to high-pressure water flow for pressure holding test, the front drive component is often affected by the strong outward thrust of the high-pressure water flow and the elastic recoil force of the seal itself to return to its original shape. This can easily cause the drive push rod to retract backward, resulting in the seal unexpectedly retracting in the expanded state and completely destroying the sealing safety of the water pressure test. Summary of the Invention

[0005] This invention provides a high-pressure water pressure testing system, which aims to solve the problem of weak points with poor sealing at the joint of high-pressure water pressure testing systems in related technologies.

[0006] A high-pressure water pressure testing system includes a main unit, an outlet pipe connected to an outlet on the side of the main unit, and a connecting device for connecting to the water inlet of the test piece at the end of the outlet pipe. The connecting device comprises: The installation pipe is connected to the outlet pipe at its end; The elastic sleeve has a sealed connection between its end and the front end of the installation tube. A support component, located inside the elastic sleeve, is used to support the elastic sleeve and maintain its cylindrical shape. The expansion component is used to expand the elastic sleeve of the support, change the diameter of the elastic sleeve, and make the elastic sleeve fit the inner wall of the water inlet end of the test piece.

[0007] Its effect is as follows: In its initial state, it presents a small cylindrical profile, allowing the entire connecting device to be easily and unobstructedly inserted into the pipe to be tested. The support component inside the elastic sleeve acts as an internal skeleton, maintaining the shape of the elastic sleeve in the initial state and preventing it from collapsing. The expansion component acts as the power actuator, applying force through internal mechanical transmission, forcing the support component to change its structural shape. After being driven by the expansion component, the support component generates radial expansion force from the inside out, directly pushing the outer elastic sleeve to expand synchronously. This causes the outer wall of the elastic sleeve to fit tightly against the inner wall of the water inlet end of the tested component, establishing a stable, reliable, and well-fitting water-stop barrier for high-pressure water pressure testing, ensuring the smooth progress of the testing process and the authenticity and validity of the test data.

[0008] Preferably, the support member is composed of multiple axially closed corrugated rings. The front end of the elastic sleeve is connected to the front end of the support member, and the end of the support member is connected to the mounting pipe. When the support member is compressed axially, the corrugated rings expand outward, increasing the diameter of the support member. In the initial state, it has a longer axial dimension and a smaller radial dimension. When the two ends of the support member are compressed axially and shortened, the included angle between the corrugated rings is forced to change, and the material flips outward, cleverly converting the axial compression displacement into a radial expansion displacement. This metal or rigid skeleton composed of corrugated rings not only provides a uniform circumferential expansion force, ensuring that the outer elastic sleeve is subjected to consistent force in all directions, but also possesses excellent compressive strength. Even when facing extremely high test water pressure impacts, it can still firmly support the outer elastic sleeve, preventing the flexible seal from localizing or tearing due to a lack of internal support.

[0009] Preferably, the spreading assembly includes two connecting rods hinged together. The hinge joints of the connecting rods are hinged to a drive unit that can move axially relative to the mounting tube. When the drive unit moves axially, it will drive the hinge joints of the two connecting rods to move synchronously, thereby changing the included angle between the connecting rods and the mounting tube, thus controlling the expansion and contraction of the elastic sleeve.

[0010] Preferably, the drive unit includes a connecting rod and a sliding sleeve. The end of the connecting rod is connected to the end of the water outlet pipe. The sliding sleeve is fixedly installed inside the installation pipe. The end of the support member is slidably connected to the sliding sleeve in the radial direction through a sliding shaft. The water outlet pipe is a telescopic structure.

[0011] Preferably, a flexible hose is connected between the water outlet pipe and the water outlet. The flexible hose also facilitates the layout and adjustment of the entire detection system in different detection scenarios, improving the system's flexibility and adaptability.

[0012] Preferably, the water outlet pipe is equipped with a fixing component to keep it at a fixed length and prevent it from extending or retracting.

[0013] Preferably, the mounting tube is provided with a positioning component for holding it at the water inlet axis of the test piece.

[0014] Preferably, the positioning assembly includes multiple support rods arranged axially along the mounting tube, the length direction of the support rods being parallel to the axis of the mounting rod, at least two connecting rods being hinged between the support rods and the mounting tube, and an elastic element being installed between the connecting rods and the mounting tube.

[0015] Preferably, the outer side of the support rod is provided with an arc-shaped protrusion, and the arc design can reduce the friction between the support rod and the inner wall of the test piece.

[0016] Preferably, the front end of the support rod is provided with a guide strip that is inclined toward the axis of the mounting tube.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. This system employs a sealing structure combining a built-in waveform ring support with an external elastic sleeve. Combined with a drive unit and linkage mechanism, it achieves a sealing method that actively compresses and expands from the inside out. The metal skeleton's support ensures that the flexible elastic sleeve maintains a stable circumferential shape even under extreme high-pressure water flow testing, preventing dents or damage, significantly improving sealing reliability and testing safety under high-pressure environments.

[0018] 2. The equipped positioning component utilizes the self-adaptive opening characteristics of elastic elements and multiple support rods to achieve automatic centering and coaxial positioning of the installation tube inside the tested component. Combined with the anti-jamming introduction design of the front guide strip and the friction-reducing protection of the arc-shaped protrusion, it not only makes the insertion and removal process smooth and effortless, but also ensures that the force is evenly distributed around the perimeter when the sealing sleeve expands, eliminating the risk of unilateral leakage caused by eccentricity. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention.

[0020] Figure 2 This is a schematic diagram of the connecting device in this invention.

[0021] Figure 3 This is a front view of the connecting device in this invention.

[0022] Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0023] Figure 5 This is a side view of the connecting device in this invention.

[0024] Figure 6 This is a schematic diagram of the connecting device in this invention after removing the fixing member and the elastic sleeve.

[0025] Figure 7 This is a schematic diagram of the installation tube in this invention.

[0026] Figure label: 1. Main unit; 11. Outlet; 12. Hose; 13. Outlet pipe; 14. Fixing component; 2. Connecting device; 21. Mounting pipe; 22. Elastic sleeve; 23. Support component; 24. Spreading assembly; 241. Connecting rod; 242. Connecting rod; 243. Sliding sleeve; 25. Positioning assembly; 251. Support rod; 252. Connecting rod; 253. Elastic component. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] like Figures 1-7As shown, a high-pressure water pressure testing system includes a main unit 1, a water outlet 11, a water outlet pipe 13, a hose 12, a fixing component 14, and a connecting device 2. The main unit 1 is equipped with a water pump that provides water pressure power, a water tank for storing test water, and related pipeline control valves and pressure display instruments. The water outlet 11 is fixedly installed on the side shell of the main unit 1. The water outlet 11 serves as the output port of the high-pressure water flow. The water outlet 13 is connected to the water outlet 11. The water outlet pipe 13 is responsible for guiding the high-pressure water flow generated inside the main unit 1 to the outside. The end of the water outlet pipe 13 is provided with a connecting device 2 for connecting the water inlet end of the test piece. The test piece is connected to the high-pressure water pressure testing system through the connecting device 2, so that the high-pressure water flow can smoothly enter the test piece for pressure resistance or sealing tests. In the entire testing process, the operator first connects the power and water supply to the main unit 1. Then, the connecting device 2 is inserted into the water inlet of the test piece to be tested. By adjusting the connecting device 2 to ensure a tight seal with the inner wall of the water inlet of the test piece, the operator then operates the control panel or valve on the main unit 1 to start the water pump. The water inside the main unit 1 is pressurized and flows out from the outlet 11, passing through the outlet pipe 13 and the connecting device 2, and finally into the internal cavity of the test piece. As the water flow continues, the pressure inside the test piece gradually increases. As the pressure increases, the operator monitors the real-time water pressure value by observing the pressure gauge on the main unit 1. When the water pressure reaches the predetermined test index, the main unit 1 stops pressurizing and maintains the pressure for a period of time to check whether the tested component will leak or rupture under the current high pressure. After the entire test process is completed, the high-pressure water flow in the pipeline and inside the tested component is released through the pressure relief valve of the main unit 1. Then, the sealing and adhesion between the connecting device 2 and the inner wall of the water inlet end of the tested component is released. Finally, the connecting device 2 is pulled out from the inside of the water inlet end of the tested component, thus completing a whole test cycle.

[0029] The connecting device 2 includes an installation pipe 21, an elastic sleeve 22, a support member 23, and a spreading component 24. The installation pipe 21 is a cylindrical tubular structure with an internal hollow channel. The end of the installation pipe 21 is connected to the end of the water outlet pipe 13, so that the high-pressure water inside the water outlet pipe 13 flows into the internal channel of the installation pipe 21. The elastic sleeve 22 is located on the outer side of the front end of the installation pipe 21. The elastic sleeve 22 is a cylindrical component made of a flexible material with good deformation recovery ability. The end of the elastic sleeve 22 is sealed to the outer wall of the front end of the installation pipe 21. This sealing connection can be achieved by mechanical pressing or bonding to ensure that the high-pressure water does not leak from the joint between the elastic sleeve 22 and the installation pipe 21 when it passes through the installation pipe 21. The support member 23 is disposed in the internal cavity of the elastic sleeve 22. The overall outer contour of the support member 23 matches the inner wall surface of the elastic sleeve 22. The support member 23 is used to support the elastic sleeve 22, so that the elastic sleeve 22 can always maintain its initial cylindrical shape in its natural state without external pressure. The support member 23 is composed of multiple closed wave rings arranged along the axial direction. These closed wave rings have a continuous undulating peak and trough structure. Multiple closed wave rings are connected end to end or arranged side by side in the axial direction. The front end of the elastic sleeve 22 is connected to the front edge of the support member 23. At the same time, the end edge of the support member 23 is slidably connected to the front end face of the mounting tube 21, so that the support member 23 has a relatively fixed force point and range of motion between the mounting tube 21 and the elastic sleeve 22. The spreading component 24 is used to apply force to deform the support member 23, thereby spreading the elastic sleeve 22 through the support member 23 and changing the outer diameter of the elastic sleeve 22. The various components under the connecting device 2 assembly cooperate with each other. In the initial state, the support member 23 maintains the cylindrical shape of the elastic sleeve 22, making the outer diameter of the elastic sleeve 22 smaller than the inner diameter of the water inlet end of the test piece. This ensures that the installation tube 21 and the elastic sleeve 22 can be smoothly and unobstructedly inserted into the water inlet end of the test piece. When the elastic sleeve 22 reaches the designated detection position inside the test piece, the spreading component 24 begins to operate. Since the front end of the elastic sleeve 22 is connected to the front end of the support member 23, and the end of the support member 23 is connected to the installation tube 21, when the spreading component 24 applies an axial compressive force to the support member 23, the support member 23 is forced to shorten in axial length. Due to the reduction in axial distance, the crests and wavy lines of the internal closed wave loop change. The change in the angle between the valleys causes the waveform ring to expand outward. During the outward expansion of the waveform ring, it directly pushes against the inner wall of the elastic sleeve 22, increasing the overall diameter of the support 23. This, in turn, forces the elastic sleeve 22, which is wrapped around the outside, to expand outward simultaneously. The outer diameter of the elastic sleeve 22 continues to increase until its outer surface is completely fitted and tightly abuts against the inner wall of the water inlet end of the test piece. The flexible material of the elastic sleeve 22 itself fills in any minor unevenness that may exist on the inner wall of the test piece, establishing a reliable water-stop sealing barrier. This prevents the high-pressure water that is subsequently injected from flowing back out of the outer gap of the elastic sleeve 22, ensuring that all the high-pressure water enters the interior of the test piece for effective testing.

[0030] The spreading assembly 24 includes two connecting rods 241 and a drive unit. One end of each connecting rod 241 intersects and is hinged together by a pin, allowing them to expand or contract relative to each other around the hinge point. The other ends of the connecting rods 241 are connected to the mounting tube 21 and the support member 23, respectively, transmitting mechanical motion to the support member 23. The drive unit is hinged at the hinge point of the two connecting rods 241. The drive unit is a mechanical structure capable of linear motion along the axial direction of the mounting tube 21. The hinge between the drive unit and the connecting rods 241 converts the linear displacement of the drive unit into spatial displacement at the hinge point of the connecting rods 241. The various components of the spreading assembly 24 play a crucial role in transmitting power and changing the direction of motion. The drive unit, as the direct actuator of the expansion action of the entire connecting device 2, plays a key role in this process. The power source is as follows: when the elastic sleeve 22 needs to expand and seal, the drive unit moves linearly along the axial direction of the mounting tube 21. The movement of the drive unit causes the hinge of the two connecting rods 241 to move synchronously. Since the other two ends of the connecting rods 241 are restricted by the relative positions of the mounting tube 21 and the support member 23, the movement of the hinge forces the included angle between the two connecting rods 241 to change. During the rotation of the connecting rods 241 to change the included angle, the axial tensile or thrust applied by the drive unit is amplified or its direction is changed, and then it is converted into an axial compressive force on the support member 23. In this mechanical transmission process, the connecting rods 241 effectively overcome the structural resistance of the closed waveform ring inside the support member 23, so that the closed waveform ring can smoothly generate a linkage deformation of axial compression and radial expansion, thereby realizing the control of the diameter change of the elastic sleeve 22 by relying on the axial linear movement of the drive unit.

[0031] The drive unit includes a connecting rod 252242 and a sliding sleeve 243. The connecting rod 252242 is a slender rod-shaped component whose length direction is approximately parallel to the axis of the mounting tube 21. The front end of the connecting rod 252242 is connected to the hinge of the two connecting rods 241 in the spreading assembly 24. The end of the connecting rod 252242 extends rearward and is connected to the end of the outlet pipe 13. The sliding sleeve 243 is fixedly installed inside the mounting tube 21. The end of the support member 23 is slidably connected to the sliding sleeve 243 in the radial direction via a sliding shaft. The outlet pipe 13 is a telescopic structure, comprising an inner pipe and an outer pipe that are nested together and can slide relative to each other. A sealing ring is provided between the inner pipe and the outer pipe to ensure that water does not leak from the pipe wall interlayer during the telescopic sliding process. The telescopic movement of the outlet pipe 13 can directly drive the connecting rod 252242 to produce a corresponding displacement in the axial direction. The front end of the outlet pipe 13 or The device is externally fitted with a fixing member 14, which is a threaded locking sleeve. The fixing member 14 is installed on the water outlet pipe 13. After the water outlet pipe 13 is adjusted to a certain extension length, the locking sleeve is tightened to lock the relative position of the inner and outer pipes of the water outlet pipe 13, so that it maintains the current fixed length and no longer slides out or retracts. A hose 12 is connected between the end of the water outlet pipe 13 and the water outlet 11 on the side of the main unit 1. The hose 12 has good flexibility and bending ability. Its internal channel is also used to deliver high-pressure water flow. One end of the hose 12 is connected to the water outlet 11 through a threaded connector, and the other end is connected to the water inlet end of the water outlet pipe 13. The hose 12 allows the operator to hold the water outlet pipe 13 and the connecting device 2 and move, rotate and adjust the angle freely in a large space around the main unit 1, which greatly improves the convenience of aligning the connecting device 2 and inserting it into the water inlet end of the test piece. The operator manually pulls or pushes the front and rear ends of the water outlet pipe 13, causing it to contract or extend in length. As the end of the water outlet pipe 13 moves, it pulls the connecting rod 252242, which in turn pulls the hinge of the connecting rod 241 at the front end. This cleverly transforms the operator's manual extension / retraction operation outside the equipment into the force that expands the elastic sleeve 22 inside the tested component. Once the elastic sleeve 22 completely adheres to and seals the inner wall of the tested component, the fixing member 14 locks in place, forcibly fixing the length of the water outlet pipe 13. The connecting rod 252242... Position 242 is locked, and the compression state of the front connecting rod 241 against the support 23 is completely fixed. Even when high-pressure water is introduced for testing, the reaction force generated by the water flow and the elastic retraction force of the elastic sleeve 22 itself attempting to return to its original shape cannot push the connecting rod 252242 and the outlet pipe 13 to move in the opposite direction. This completely avoids the serious problem of the elastic sleeve 22 retracting and the seal failing due to the unexpected movement of the front end of the installation pipe 21 relative to the connecting rod 252242 during the testing process, ensuring the smooth and safe operation of the high-pressure water pressure testing process.

[0032] The positioning component 25 is disposed in the peripheral area of ​​the mounting tube 21. The positioning component 25 includes multiple support rods 251, which are arranged in a circumferential array around the outer wall of the mounting tube 21. All support rods 251 are arranged along the axial direction of the mounting tube 21, and the overall length direction of the support rods 251 is parallel to the central axis of the mounting tube 21. On the outer surface of the support rod 251, i.e., the side facing the inner wall of the water inlet end of the test piece, an arc-shaped protrusion is integrally formed or additionally installed. The arc-shaped protrusion has a smooth transition surface. At the front end of the support rod 251, i.e., the end closest to the insertion point into the test piece, a guide strip is provided. The guide strip has a sloping structure that gradually slopes from the outside inwards towards the central axis of the mounting tube 21. The inner surface of the support rod 251... A connecting rod 252242 is provided between the side and the outer wall of the mounting tube 21. There are at least two connecting rods 252242. The two ends of each connecting rod 252242 are respectively hinged to the support rod 251 and the mounting tube 21 by pins, so that the support rod 251 can move closer or further away from the mounting tube 21 in the radial direction, and always remain parallel to the axis of the mounting tube 21 during the movement. An elastic element 253 is installed between the connecting rod 252242 and the mounting tube 21. The elastic element 253 is a spring sheet structure. One end of the elastic element 253 abuts against the outer wall of the mounting tube 21, and the other end presses against the connecting rod 252242. The elastic element 253 is always in a certain compressed state, thereby outputting a continuous elastic force outward. The positioning component 25 provides precise alignment and guidance when the connecting device 2 is inserted into the test piece. When the operator pushes the installation tube 21 with the positioning component 25 toward the water inlet end of the test piece, the guide bar at the front end of the support rod 251 first contacts the edge port of the water inlet end of the test piece. After contacting the edge of the port, the inclined slope of the guide bar converts the forward thrust into an inward radial compressive force, causing the support rod 251 to overcome the elastic force of the elastic element 253 under the guidance of the guide bar and retract toward the central axis of the installation tube 21. This greatly reduces the alignment difficulty during initial insertion and ensures that the installation tube 21 can smoothly and without jamming into the test piece. After the installation tube 21 enters the water inlet end of the test piece, the elastic element 253 releases its stored elastic potential energy, pushing the connecting rod 252242 outward through the elastic force. The connecting rod 252242 then pushes... Push the support rod 251 outward until the arc-shaped protrusion on the outer surface of the support rod 251 is tightly abutted against the inner wall of the water inlet end of the test piece. Multiple evenly distributed support rods 251 expand outward simultaneously under the action of the elastic element 253, generating a balanced support force in all directions on the installation tube 21. This balanced support force firmly constrains the installation tube 21 to the center position of the water inlet end of the test piece, achieving basic coaxiality between the installation tube 21 and the water inlet end. The arc-shaped protrusion on the outer surface of the support rod 251 effectively reduces the contact area between the support rod 251 and the inner wall of the test piece, reducing the sliding friction between them and preventing scratches on the inner wall surface of the test piece during the pushing and pulling of the installation tube 21. The positioning component 25 keeps the installation tube 21 at the axis of the water inlet end of the test piece, thereby ensuring that every outer surface of the elastic sleeve 22 is subjected to the same intensity of compression, achieving the optimal circumferential sealing effect.

[0033] Working principle: Before conducting the high-pressure water pressure test, the entire equipment is in an initial relaxed state. At this time, the fixing part 14 on the outlet pipe 13 is in the loose position, and the inner and outer pipes of the outlet pipe 13 are not locked. The elastic sleeve 22 at the front end of the installation pipe 21 maintains its minimum diameter cylindrical shape under the natural support of the closed waveform ring inside the support part 23. The support rod 251 in the positioning assembly 25 is in its maximum expansion diameter state under the push of the elastic part 253. The operator first holds the outlet pipe 13 and the connecting device 2 at the end of the hose 12 and aligns the front end of the installation pipe 21 with the water inlet end of the test piece. Then, the operator applies a forward thrust to insert the elastic sleeve 22 and the installation pipe 21 together with the positioning assembly 25 into the water inlet end of the test piece. At the moment of insertion, the guide strip at the front end of the support rod 251 on the periphery of the installation pipe 21 first physically collides with the edge of the water inlet end of the test piece. Because the guide bar is an inclined structure oriented towards the axis of the mounting pipe 21, the reaction force generated by the edge of the water inlet on the guide bar forces the support rod 251 to retract inward. The inward retraction of the support rod 251 drives the hinged connecting rod 252242 to rotate, while further compressing the internal elastic element 253. After the connecting device 2 enters the water inlet of the test piece, the support rod 251 cannot be fully extended due to the restriction of the inner diameter of the water inlet on the support rod 251. At this time, the continuous rebound force of the elastic element 253 attempting to restore its original shape acts on the connecting rod 252242, causing the connecting rod 252242 to push the arc-shaped protrusion on the outer side of the support rod 251 to remain in contact with the inner wall of the water inlet of the test piece at all times. Multiple circumferentially distributed support rods 251 are simultaneously constrained by the pipe wall and pushed outward by the elastic element 253. This circumferential force balance automatically adjusts and fixes the position of the mounting tube 21 on the central axis of the water inlet end of the test piece, achieving basic coaxiality between the mounting tube 21 and the water inlet end of the test piece. Furthermore, the presence of the arc-shaped protrusion makes subsequent fine-tuning and sliding smoother. After ensuring that the mounting tube 21 is centered and the insertion depth reaches the designated area required for the test, the operator holds the stable part of the test piece or mounting tube 21 with one hand and manually pulls the front end of the outlet tube 13 backward with the other hand, causing the outlet tube 13 to stretch outward towards the water inlet end of the test piece. During the relative sliding process of the outlet tube 13, the outlet tube 13 pulls the connecting rod 252242 to move axially inside or parallel to the mounting tube 21. At this time, the axial displacement of the connecting rod 252242 is transmitted to the spreading assembly 24, pulling the hinge of the two front connecting rods 241. Under tension, the two connecting rods 241 change their included angle, generating a strong axial compressive force on the support member 23 at their ends. The front end of the mounting tube 21 provides a fixed reaction surface, thus the support member 23 is subjected to severe axial compression between the mounting tube 21 and the connecting rods 241. The internal structure of the support member 23, consisting of multiple closed corrugated rings, forces the material of the corrugated rings to flip and expand outward under axial compression. This outward expansion of the corrugated rings directly results in a significant increase in the overall diameter of the support member 23.As the diameter of the support member 23 increases, the elastic sleeve 22, which is fitted outside the support member 23, is stretched outward evenly by the internal expansion force, changing the original diameter of the elastic sleeve 22. The outer wall of the elastic sleeve 22 continues to expand outward until its outer surface forms a large area of ​​tight contact with the inner wall of the water inlet end of the tested component and abuts firmly. Due to the flexibility of the elastic sleeve 22, an annular water seal is formed, thereby blocking the path of water flow through the gaps on the outside of the elastic sleeve 22. After confirming that the elastic sleeve 22 has fully expanded and formed an effective seal, the operator operates the fixing member 14 on the water outlet pipe 13 to completely lock the extension and retraction state of the water outlet pipe 13. After the fixing member 14 is locked, the length of the water outlet pipe 13 remains fixed and no longer extends or retracts, maintaining the compression state of the connecting rod 241 on the support member 23. After the seal is fixed, the operator starts the pressurization program on the main unit 1 panel, and the water pump inside the main unit 1 starts to work. The water in the water tank is pumped to the water outlet 11 and converted into a high-pressure water flow. High-pressure water flows through hose 12 into a fixed-length outlet pipe 13, and then into the internal channel of mounting pipe 21. Since the outer side of the elastic sleeve 22 is completely sealed, the high-pressure water can only flow through the opening at the front end of mounting pipe 21, continuously injecting water into the inlet end of the tested component. As water is injected, air inside the tested component can be discharged through the vent valve at the other end; the vent valve is closed after the component is full. The water pump continues to operate, and the water pressure inside the tested component rapidly rises to the predetermined high-pressure detection value. The pressure sensor on the main unit 1 monitors the pressure changes in real time and displays them on the screen. After reaching the detection pressure, the water pump stops working, and the system enters the pressure holding stage. During the set pressure holding time, the operator observes whether water droplets seep out from the outer wall of the tested component and whether there is a significant pressure drop on the pressure gauge of the main unit 1, thereby judging the water pressure resistance and overall sealing performance of the tested component. After the detection time ends and all data is confirmed to be recorded, the operator opens the pressure relief valve on the main unit 1 to discharge and empty the high-pressure water from the pipeline and inside the tested component. After the internal pressure of the system returns to normal, the operator manually opens the fixing piece 14 on the outlet pipe 13 to release the lock on the extension length of the outlet pipe 13. At this time, the force applied to pull backward is removed, and the outlet pipe 13 retracts and slides under the elastic force of the internal components or the manual forward pushing force. The retraction of the outlet pipe 13 pushes the connecting rod 252242 to move in the opposite direction, and the hinge of the connecting rod 241 moves accordingly, releasing the axial compression force on the support member 23. The installation pipe 21 releases the compression restriction on the support member 23, and the closed wave ring inside the support member 23 relies on the elastic restoring force of the material itself to return from the expanded state to the initial axial length and smaller radial diameter. The reduction in the diameter of the support member 23 causes the elastic sleeve 22 wrapped on the outside to lose its internal support. The elastic sleeve 22 relies on its own rubber elasticity to return to the initial cylindrical shape, and the outer surface of the elastic sleeve 22 is separated from the inner wall of the water inlet end of the tested component, and the seal is released.Finally, the operator grips the connecting device 2 and applies force outward to overcome the small frictional force of the elastic element 253 in the positioning component 25, so that the connecting device 2 is pulled out smoothly from the water inlet of the test piece, the residual water is cleaned and it is properly placed, ready to enter the testing process of the next test piece.

[0034] The operation method of a high-pressure water pressure testing system is as follows: s1. System Initialization and Equipment Status Check: The operator first prepares the main unit 1 of the high-pressure water pressure detection system by powering on and filling it with water. They check if the water level in the tank is sufficient, confirm that the readings of all pressure gauges and sensors on the control panel of the main unit 1 are zero, and check if the water pump and all pipeline control valves inside the main unit 1 are in normal standby closed state. Then, the operator carefully inspects the appearance of the connecting device 2, confirming that the elastic sleeve 22 at the front end of the mounting pipe 21 has no obvious damage, scratches, or aging cracks. They check if the support rod 251 in the positioning assembly 25 can smoothly spring radially under the push of the elastic element 253, and whether the fixing element 14 on the outlet pipe 13 is fully loosened and the outlet pipe 13 can freely extend and retract in its initial state.

[0035] s2. Guiding insertion and automatic centering alignment of connecting device 2: The operator holds the front end of the pipe with water outlet pipe 13 and connecting device 2, and pulls the hose 12 to the workbench where the test piece is located. After the test piece is stably placed, the front end of the installation tube 21 is aligned with the water inlet opening of the test piece. The operator applies a smooth, forward horizontal thrust, causing the guide strip at the front end of the positioning component 25 to first contact the edge of the water inlet. As the thrust continues, the guide strip guides the support rod 251 to retract towards the central axis against the resistance of the elastic element 253, allowing the installation tube 21 and the elastic sleeve 22 to slide smoothly into the interior of the water inlet. After extending to the specified length, the reaction force of the elastic element 253 pushes the arc-shaped protrusion on the outer side of the support rod 251 to tightly press against the inner wall of the test piece. Utilizing the principle of multi-point balanced support, the position of the installation tube 21 is automatically fixed on the central axis of the water inlet of the test piece, completing precise coaxial positioning.

[0036] s3. Mechanical transmission expansion and high-pressure seal establishment: After confirming that the position of the installation pipe 21 will no longer move significantly, the operator pulls or pushes the front and rear ends of the outlet pipe 13 to cause it to slide. At this time, the outlet pipe 13 drives the internal connecting rod 252242 to move synchronously along the axial direction of the installation pipe 21. The movement of the connecting rod 252242 pulls the front-end expansion component 24, causing the two connecting rods 241 to rotate relative to each other at the hinge, and transmitting the axial force to the support member 23. Multiple closed corrugated rings inside the support member 23 are forced to deform after being subjected to severe axial compression, and the corrugated rings expand radially outward. The expanding corrugated rings exert a huge thrust from the inside out, causing the elastic sleeve 22 wrapped around the outside to deform synchronously with an increased diameter, until the soft outer surface of the elastic sleeve 22 forms a large area of ​​high-pressure tight contact with the inner wall of the water inlet end of the tested component, thereby forming a continuous water-stop sealing ring between the pipe walls.

[0037] s4. Mechanical Locking and Fixing in Sealed State: When the operator feels a significant increase in pulling resistance on the outlet pipe 13, and confirms that the elastic sleeve 22 is fully fitted and tightened against the inner wall, stop pulling on the outlet pipe 13. Then, operate the external fixing component 14 of the outlet pipe 13, by rotating the nut clockwise or engaging the tightening wrench, to completely lock the telescopic structure of the outlet pipe 13. The fixing component 14 transforms the current length of the outlet pipe 13 into an unchangeable rigid state. This cuts off the interference path of the elastic sleeve 22's rebound force and the subsequent high-pressure water flow's backlash on the internal mechanical structure, ensuring that the sealed state remains absolutely stable throughout the high-pressure test.

[0038] s5. High-Pressure Water Injection and Air Evacuation: After sealing and locking, the operator inputs the target pressure value required for this test on the control panel of the main unit 1 and starts the water pump. The water pump draws water from the tank, pressurizes it, and delivers it to the hose 12 through the outlet 11. The high-pressure water flows smoothly along the hose 12 and the locked outlet pipe 13 into the internal channel of the installation pipe 21. Since the outer side of the elastic sleeve 22 is completely sealed, the water can only be injected directly into the internal cavity of the test piece from the front nozzle of the installation pipe 21. In the initial stage of water injection, the operator needs to open the exhaust valve at the other end or a higher position of the test piece to gradually squeeze out the residual air inside the cavity using the continuously flowing water. After the air is evacuated, the exhaust valve is closed.

[0039] s6. Pressure Rise and Static Pressure Holding Monitoring: After the exhaust valve is closed, the water pump continues to force-inflate high-pressure water into the sealed test component. The operator closely monitors the real-time pressure change curve on the main unit 1 screen. As the absolute amount of water inside the test component increases, the water pressure rises rapidly. When the value fed back by the pressure sensor reaches the preset high-pressure detection index, the main unit 1 control system automatically cuts off the water pump power and closes the inlet check valve, and the system officially enters the pressure holding monitoring stage. During this period, the operator needs to use a strong flashlight or testing tools to carefully inspect the outer surface of the test component, welded joints, and the sealing point of the elastic sleeve 22 for signs of water droplet leakage, small sprays, or pressure deformation, while recording the small pressure drop value of the pressure gauge on the main unit 1 within the specified time.

[0040] s7. System Depressurization and Internal Piping Drainage: After the pressure holding time reaches the specified standard and all relevant test data has been collected and recorded, the operator must perform a safe pressure release operation. Press the pressure relief button on the main unit 1 panel, or manually and slowly rotate the pressure relief valve handwheel. The high-pressure water accumulated inside the tested component and throughout the entire piping system will flow back through the pressure relief channel to the water storage tank of the main unit 1 or a dedicated drainage pipe. The operator must observe the pressure gauge pointer until it completely drops and stabilizes at the zero mark, ensuring that the internal and external pressures of the system reach a balanced state, thereby completely eliminating the potential operational hazards of high pressure.

[0041] s8. Mechanical unlocking and retraction reset of elastic sleeve 22: After confirming that the system is safe and pressure-free, the operator begins to disassemble the connecting device 2. First, reverse the operation of the fixing part 14 on the water outlet pipe 13, loosen the nut or lift the clamping wrench to release the locking restriction on the extension length of the water outlet pipe 13. Then, the operator pushes the water outlet pipe 13 forward, causing it to retract and slide. The retraction of the water outlet pipe 13 drives the connecting rod 252242 to move forward and backward, and the included angle at the hinge of the connecting rod 241 is restored, releasing the axial compressive force on the support member 23. After losing the compression, the closed wave ring inside the support member 23 recovers to its initial length by relying on the elastic memory of its own material, and its radial diameter decreases accordingly. The elastic sleeve 22, which loses the support of the internal skeleton, also retracts to its initial cylindrical shape, and its outer surface completely separates from the inner wall of the water inlet end of the tested part, thus completely releasing the sealing effect.

[0042] s9. Removal and Maintenance of Connecting Device 2: After the elastic sleeve 22 has fully retracted, the operator holds the rear of the connecting device 2 and applies a backward pulling force. During the outward pulling process, the support rod 251 of the positioning component 25 slides smoothly along the inner wall of the test piece under the buffer of the elastic element 253 until the connecting device 2 is smoothly detached from the water inlet end of the test piece. After removal, the operator should use a clean, dry cloth to wipe away any residual water stains adhering to the surface of the elastic sleeve 22, the installation tube 21, and the positioning component 25, and check for rust or jamming at each moving joint. If necessary, apply an appropriate amount of lubricating grease to the hinge of the connecting rod 241. Finally, coil the hose 12 neatly and hang the connecting device 2 back on the dedicated placement rack on the side of the main unit 1, completing the periodic repositioning and maintenance operation of the entire testing system.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-pressure water pressure testing system, comprising a main unit, an outlet pipe connected to a water outlet on the side of the main unit, and a connecting device for connecting the water inlet of the test piece at the end of the outlet pipe, characterized in that: The connecting device includes: The installation pipe is connected to the outlet pipe at its end; The elastic sleeve has a sealed connection between its end and the front end of the installation tube. A support component, located inside the elastic sleeve, is used to support the elastic sleeve and maintain its cylindrical shape. The expansion component is used to expand the elastic sleeve of the support, change the diameter of the elastic sleeve, and make the elastic sleeve fit the inner wall of the water inlet end of the test piece.

2. The high-pressure water pressure detection system according to claim 1, characterized in that, The support consists of multiple axially closed corrugated rings. The front end of the elastic sleeve is connected to the front end of the support, and the end of the support is connected to the mounting tube. When the support is compressed axially, the corrugated rings expand outward, increasing the diameter of the support.

3. The high-pressure water pressure detection system according to claim 1, characterized in that, The spreading assembly includes two hinged links, the hinges of which are connected to a drive unit capable of axial movement relative to the mounting tube.

4. The high-pressure water pressure detection system according to claim 3, characterized in that, The drive unit includes a connecting rod and a sliding sleeve. The end of the connecting rod is connected to the end of the water outlet pipe. The sliding sleeve is fixedly installed inside the installation pipe. The end of the support member is slidably connected to the sliding sleeve in the radial direction through a sliding shaft. The water outlet pipe is a telescopic structure.

5. The high-pressure water pressure detection system according to claim 4, characterized in that, A flexible hose is connected between the water outlet pipe and the water outlet.

6. The high-pressure water pressure detection system according to claim 4, characterized in that, The water outlet pipe is equipped with a fixing component to keep it at a fixed length and prevent it from extending or retracting.

7. The high-pressure water pressure detection system according to any one of claims 1-6, characterized in that, The mounting tube is equipped with a positioning component for holding the test piece at the water inlet axis.

8. The high-pressure water pressure detection system according to claim 7, characterized in that, The positioning assembly includes multiple support rods arranged axially along the mounting tube. The length direction of the support rods is parallel to the axis of the mounting rod. At least two connecting rods are hinged between the support rods and the mounting tube, and an elastic element is installed between the connecting rods and the mounting tube.

9. The high-pressure water pressure detection system according to claim 8, characterized in that, The outer side of the support rod is provided with an arc-shaped protrusion.

10. The high-pressure water pressure detection system according to claim 8, characterized in that, The front end of the support rod is provided with a guide bar that is inclined toward the axis of the mounting tube.

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