A cyclic load testing device for metal hoses used in nuclear power plants

Abstract

This invention belongs to the field of nuclear power equipment safety testing technology, specifically relating to a cyclic load testing device for metal hoses used in nuclear power plants. The device includes a positioning frame and a conveying assembly. The positioning frame is used for installing the metal hose, and a driving assembly is mounted on the positioning frame. The driving assembly is used to perform load tests on the metal hose, and the conveying assembly is used to inject and output cold or hot water into the metal hose. By designing hot water circulation loops and ambient temperature water circulation loops, combined with the driving assembly to perform load tests on the metal hose, this invention can comprehensively simulate the alternating hot and cold temperatures and dynamic stress states of the metal hose under nuclear power environment, thereby more accurately assessing its durability and reliability.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power equipment safety testing technology, specifically relating to a cyclic load testing device for metal hoses used in nuclear power plants. Background Technology

[0002] In the nuclear power industry, metal hoses, as an important component of connecting piping systems, undertake the crucial tasks of transporting fluids, transmitting pressure, and withstanding various complex operating conditions. Because their working environment often involves extreme conditions such as high temperature, high pressure, strong radiation, and frequent temperature changes, the performance stability and durability of metal hoses are among the key factors ensuring the safe operation of nuclear power equipment.

[0003] Although existing metal hoses undergo a series of quality controls and performance tests during the design and production process, there is still a lack of specialized testing equipment and methods to ensure the safety and reliability of metal hoses used in nuclear power plants, given the unique rapid cooling and heating cyclic load conditions in the nuclear power field.

[0004] Therefore, it is particularly important to develop a test device that can simulate the cold and hot cyclic loads experienced by metal hoses in a nuclear power environment. Summary of the Invention

[0005] The purpose of this invention is to provide a cyclic load testing device for metal hoses used in nuclear power plants. This device, by designing hot water circulation loops and ambient temperature water circulation loops, combined with drive components, conducts load tests on metal hoses. It can comprehensively simulate the alternating hot and cold conditions and dynamic stress state of metal hoses in a nuclear power environment, thereby more accurately evaluating their durability and reliability.

[0006] Technical solution to achieve the purpose of this invention:

[0007] A cyclic load testing device for metal hoses used in nuclear power plants, the device includes a positioning frame and a conveying assembly. The positioning frame is used for installing the metal hose and is equipped with a driving assembly for performing load tests on the metal hose. The conveying assembly is used for injecting and outputting cold or hot water into the metal hose.

[0008] The positioning frame includes a receiving groove and a connecting rod disposed on the receiving groove; the connecting rod is provided with a clamp for installing one end of the metal hose, the receiving groove is located below the clamp, and the opening of the receiving groove faces the clamp.

[0009] Limiting blocks are slidably provided on the opposite walls of the receiving groove. After the metal hose is bent in the receiving groove, the limiting blocks are located inside the metal hose. Both limiting blocks are provided with linkage blocks. A power motor is provided on the receiving groove. A lead screw is coaxially provided on the motor shaft of the power motor. The lead screw is provided with two threads with opposite directions. The two linkage blocks are respectively connected to the lead screw through the two threads.

[0010] The walls of the receiving groove and the outer walls of the limiting block are both coated with a low-friction coating.

[0011] The drive assembly includes a drive cylinder mounted on a receiving groove. The axis of the drive cylinder is parallel to the central axis of the clamp. A push plate is provided on the end face of the piston rod of the drive cylinder, and the free end of the metal hose is connected to the push plate.

[0012] The push plate is equipped with a displacement sensor to detect the movement distance of the free end of the metal hose and transmit the detection information to the controller.

[0013] The push plate is equipped with a drive motor, and the motor shaft of the drive motor is coaxially equipped with a drive gear. A driven gear is rotatably provided on the push plate. The driven gear meshes with the drive gear and is connected to the free end of the metal hose.

[0014] The conveying assembly includes: a hot water inlet plunger pump, a hot water outlet plunger pump, a normal temperature water inlet plunger pump, a normal temperature water outlet plunger pump, a normal temperature water tank, a hot water tank, a circulating water pipe, a hot water pipe, and a normal temperature water pipe; the two inlets of the metal flexible hose near the clamp are respectively connected to the hot water pipe and the normal temperature water pipe, and the outlet is connected to one end of the circulating water pipe, and the two outlets at the other end of the circulating water pipe are respectively provided with a first return water pipe and a second return water pipe; the first return water pipe, the normal temperature water inlet plunger pump, the third return water pipe, the normal temperature water tank, the first outlet water pipe, the normal temperature water outlet plunger pump, and the normal temperature water pipe are connected in sequence; the second return water pipe, the hot water inlet plunger pump, the fourth return water pipe, the hot water tank, the second outlet water pipe, the hot water outlet plunger pump, and the hot water pipe are connected in sequence.

[0015] The circulating water pipe is equipped with a pressure transmitter and a temperature transmitter, which are used to detect the pressure and temperature of the liquid inside the metal hose and transmit the data to the controller.

[0016] The first return water pipe is equipped with a normal temperature water inlet valve and a normal temperature water outlet valve. The second return water pipe is equipped with a hot water inlet valve and a hot water outlet valve.

[0017] The beneficial technical effects of this invention are as follows:

[0018] 1. The present invention provides a cyclic load test device for metal hoses used in nuclear power plants. By designing hot water circulation loops and normal temperature water circulation loops, and combining them with drive components to conduct load tests on metal hoses, the device can comprehensively simulate the alternating hot and cold conditions and dynamic stress state of metal hoses in nuclear power environments, thereby more accurately evaluating their durability and reliability.

[0019] 2. The present invention provides a cyclic load testing device for metal hoses used in nuclear power plants. The device uses a displacement sensor to detect the movement distance of the free end of the metal hose and transmits the detection information to the controller. The device uses a pressure transmitter and a temperature transmitter to monitor the pressure and temperature of the liquid inside the metal hose in real time. Combined with a precisely controlled pump and valve system, the device achieves precise control of the test conditions and ensures the accuracy and repeatability of the test results.

[0020] 3. The present invention provides a cyclic load testing device for metal hoses used in nuclear power plants, which prevents excessive bending of the metal hose by setting a limiting block and uses a low-friction coating to reduce wear and frictional heat, thereby improving the safety and reliability of the test process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a cyclic load testing device for metal hoses used in nuclear power plants provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a cyclic load testing device for metal hoses used in nuclear power plants, provided by the present invention, in which the metal hose is placed outside the receiving tank.

[0023] In the diagram: 2-Positioning frame; 3-Drive assembly; 4-Conveying assembly; 5-Connecting rod; 6-Clamping clamp; 7-Tee pipe; 8-Hot water inlet plunger pump; 9-Hot water outlet plunger pump; 10-Ambient temperature water inlet plunger pump; 11-Ambient temperature water outlet plunger pump; 12-Ambient temperature water tank; 13-Hot water tank; 14-Circulating water pipe; 15-Hot water pipe; 16-Ambient temperature water pipe; 17-Pressure transmitter; 18-Temperature transmitter; 19-Tee pipe; 20-First return water pipe; 21-Second return water pipe; 22-Second return water pipe; 23-Normal temperature water inlet valve; 24-Third return water pipe; 25-First outlet water pipe; 26-Normal temperature water outlet valve; 27-Hot water inlet valve; 28-Fourth return water pipe; 29-Second outlet water pipe; 30-Hot water outlet valve; 31-Receiving tank; 32-Drive cylinder; 33-Push plate; 34-Drive gear; 35-Driven gear; 36-Limit block; 37-Linkage block; 38-Power motor; 39-Screw; 40-Metal hose. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 , Figure 2 As shown, the present invention provides a cyclic load testing device for a metal hose used in nuclear power plants, including a conveying assembly 4 and a positioning frame 2. The conveying assembly 4 is used to inject and output cold or hot water into the metal hose 40, and the positioning frame 2 is used for mounting the metal hose 40. The positioning frame 2 is provided with a driving assembly 3 for performing load tests on the metal hose 40.

[0026] During the experiment, hot or cold water is introduced into the metal hose using the delivery component, and the metal hose is subjected to a load test using the drive component. This allows for the implementation of a rapid cooling and heating cyclic load test on the metal hose.

[0027] The positioning frame 2 includes a receiving groove 30 and a connecting rod 5. The connecting rod 5 is vertically arranged on the receiving groove 30. A clamp 6 is provided on the connecting rod 5. The clamp 6 is used to install one end of the metal hose 40. The clamp 6 fixes one end of the metal hose 40 as a fixed end. The receiving groove 30 is located below the clamp 6, and the opening of the receiving groove 30 faces the clamp 6.

[0028] like Figure 2 As shown, the drive assembly 3 includes a drive cylinder 31 disposed on the receiving groove 30. The axis of the drive cylinder 31 is parallel to the axis of the connecting rod 5. A push plate 32 is provided on the end face of the piston rod of the drive cylinder 31. The push plate 32 is disposed on the side close to the receiving groove 30. A drive motor 33 is disposed on the push plate 32. A drive gear 34 is coaxially disposed on the motor shaft of the drive motor 33. A driven gear 35 is rotatably disposed on the push plate 32. The driven gear 35 is meshed with the drive gear 34. The driven gear 35 is connected to the free end of the metal hose 40.

[0029] Before the test, the metal hose is installed on the clamp and the push plate respectively. Then, the push plate is moved by the drive cylinder, which pushes the metal hose to bend to one side of the receiving tank so that the two ends of the metal hose are flush. During the linear reciprocating test, the drive cylinder pushes the push plate down, and the metal hose bends to the bottom wall of the receiving tank. This allows the load test on the metal hose to be carried out.

[0030] During the torsion test, keep both ends of the metal hose flush, and use the drive motor to drive the drive gear and driven gear to rotate, which in turn causes the metal hose to twist, thus enabling the torsion test to be performed on the metal hose.

[0031] In another specific embodiment, a displacement sensor is installed on the push plate 32 to detect the movement distance of the free end of the metal hose 40 and transmit the detection information to the controller. The pressure transmitter 17 and the temperature transmitter 18 respectively detect the temperature and pressure of the liquid in the metal hose 40 and transmit the data to the controller to ensure the accuracy and real-time performance of the data.

[0032] Limiting blocks 36 are slidably provided on the opposite walls of the receiving groove 30. After the metal hose 40 is bent in the receiving groove 30, the limiting blocks 36 are located inside the metal hose 40. Both limiting blocks 36 are provided with linkage blocks 37. The receiving groove 30 is provided with a power motor 38. The motor shaft of the power motor 38 is coaxially provided with a lead screw 39. The lead screw 39 is provided with two threads with opposite directions. One linkage block 37 is connected to one of the threads, and the other linkage block 37 is connected to the other thread. The threads connect the linkage block 37 to the lead screw 39.

[0033] After the metal hose is bent into the receiving groove, during the linear reciprocating test, the lead screw is driven by the power motor to rotate, which in turn pushes the limit block to move. The two limit blocks are used to limit the linear movement range of the metal hose and prevent the metal hose from moving out of control.

[0034] In another specific embodiment, the walls of the receiving groove 30 and the outer walls of the limiting block 36 are both coated with a low-friction coating. Using a low-friction coating helps to reduce the impact on experimental results. Specifically, the low-friction coating is a polytetrafluoroethylene (PTFE) coating.

[0035] like Figure 1-2 As shown, the conveying assembly 4 includes a hot water inlet plunger pump 8, a hot water outlet plunger pump 9, a normal temperature water inlet plunger pump 10, a normal temperature water outlet plunger pump 11, a normal temperature water tank 12, a hot water tank 13, a circulating water pipe 14, a hot water pipe 15, and a normal temperature water pipe 16.

[0036] In one specific embodiment, the ambient temperature water tank 12 can be connected to an external water source or an external condenser to maintain the ambient temperature water tank 12 at room temperature. The hot water tank 13 is equipped with a heating plate and a temperature transmitter. The heating plate heats the water, and the temperature transmitter detects the water temperature. Heating stops when the set temperature is reached.

[0037] The metal hose 40 is provided with a four-way pipe 7 at one end near the clamp 6. Two inlets of the four-way pipe 7 are connected to the hot water pipe 15 and the normal temperature water pipe 16, respectively. The outlet of the four-way pipe 7 is connected to the circulating water pipe 14. The circulating water pipe 14 is provided with a pressure transmitter 17 and a temperature transmitter 18, respectively. The other end of the circulating water pipe 14 is provided with a three-way pipe 19. The two outlets of the three-way pipe 19 are provided with a first return water pipe 20 and a second return water pipe 21, respectively.

[0038] The other end of the first return water pipe 20 is connected to the ambient temperature water inlet plunger pump 10. The first return water pipe 20 is equipped with an ambient temperature water inlet valve 22. The outlet of the ambient temperature water inlet plunger pump 10 is connected to the ambient temperature water tank 12 through the third return water pipe 23. The ambient temperature water tank 12 is connected to the ambient temperature water outlet plunger pump 11 through the first outlet pipe 24. The outlet of the ambient temperature water outlet plunger pump 11 is connected to the ambient temperature water pipe 16. The ambient temperature water pipe 16 is equipped with an ambient temperature water outlet valve 25.

[0039] The other end of the second return water pipe 21 is connected to the hot water inlet plunger pump 8. A hot water inlet valve 26 is provided on the second return water pipe 21. The outlet of the hot water inlet plunger pump 8 is connected to the hot water tank 13 through the fourth return water pipe 27. The hot water tank 13 is connected to the hot water outlet plunger pump 9 through the second outlet water pipe 28. The outlet of the hot water outlet plunger pump 9 is connected to the hot water pipe 15. A hot water outlet valve 29 is provided on the hot water pipe 15.

[0040] During the test, the hot water inlet and outlet valves were opened, and the hot water circulation loop started operating. When the temperature transmitter at the outlet of the metal hose reached the operating temperature of the metal hose, the hot water circulation loop operated for one minute. Then, the hot water inlet valve and the hot water inlet plunger pump were shut off. The hot water outlet plunger pump raised the internal pressure of the metal hose to the design pressure, then the hot water outlet valve closed, and the drive assembly started operating to test the metal hose. After the test, the ambient temperature water inlet and outlet valves were opened, and the ambient temperature water circulation loop started operating. When the temperature transmitter reading reached room temperature, the ambient temperature water circulation loop operated for one minute. Then, the ambient temperature water inlet valve and the ambient temperature water inlet plunger pump were shut off. The ambient temperature water outlet plunger pump raised the internal pressure of the metal hose to the design pressure, then the ambient temperature water outlet valve closed, and the drive assembly started operating to test the metal hose again. This allows for large temperature changes to verify the metal hose's ability to withstand sudden cooling and heating.

[0041] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A cyclic load testing device for metal flexible hoses used in nuclear power plants, characterized in that, The device includes a positioning frame (2) and a conveying assembly (4). The positioning frame (2) is used for installing the metal hose (40). The positioning frame (2) is equipped with a driving assembly (3). The driving assembly (3) is used to perform a load test on the metal hose (40). The conveying assembly (4) is used to inject and output cold or hot water into the metal hose (40). The positioning frame (2) includes a receiving groove (30) and a connecting rod (5) provided on the receiving groove (30); the connecting rod (5) is provided with a clamp (6), which is used to install one end of the metal hose (40), the receiving groove (30) is located below the clamp (6), and the opening of the receiving groove (30) faces the clamp (6). The drive assembly (3) includes a drive cylinder (31) disposed on the receiving groove (30). The axis of the drive cylinder (31) is parallel to the central axis of the clamp (6). A push plate (32) is provided on the end face of the piston rod of the drive cylinder (31). The free end of the metal hose (40) is connected to the push plate (32). A drive motor (33) is provided on the push plate (32). A drive gear (34) is coaxially provided on the motor shaft of the drive motor (33). A driven gear (35) is rotatably provided on the push plate (32). The driven gear (35) meshes with the drive gear (34). The driven gear (35) is connected to the free end of the metal hose (40).

2. The cyclic load testing device for metal flexible hoses used in nuclear power plants according to claim 1, characterized in that, Limiting blocks (36) are slidably provided on the opposite walls of the receiving groove (30). After the metal hose (40) is bent in the receiving groove (30), the limiting blocks (36) are located inside the metal hose (40). Both limiting blocks (36) are provided with linkage blocks (37). The receiving groove (30) is provided with a power motor (38). The motor shaft of the power motor (38) is coaxially provided with a lead screw (39). The lead screw (39) is provided with two threads with opposite directions. The two linkage blocks (37) are respectively connected to the lead screw (39) through two threads.

3. The cyclic load testing device for metal flexible hoses used in nuclear power plants according to claim 2, characterized in that, The walls of the receiving groove (30) and the outer walls of the limiting block (36) are coated with a low-friction coating.

4. The cyclic load testing device for metal flexible hoses used in nuclear power plants according to claim 1, characterized in that, The push plate (32) is equipped with a displacement sensor to detect the movement distance of the free end of the metal hose (40) and transmit the detection information to the controller.

5. The cyclic load testing device for metal flexible hoses used in nuclear power plants according to claim 1, characterized in that, The conveying assembly (4) includes: a hot water inlet plunger pump (8), a hot water outlet plunger pump (9), a normal temperature water inlet plunger pump (10), a normal temperature water outlet plunger pump (11), a normal temperature water tank (12), a hot water tank (13), a circulating water pipe (14), a hot water pipe (15), and a normal temperature water pipe (16); the two inlets of the metal hose (40) near the clamp (6) are respectively connected to the hot water pipe (15) and the normal temperature water pipe (16), and the outlet is connected to one end of the circulating water pipe (14), and the other end of the circulating water pipe (14) is connected to the hot water pipe (15) and the normal temperature water pipe (16). The two outlets are respectively equipped with a first return water pipe (20) and a second return water pipe (21); the first return water pipe (20), the ambient temperature water inlet plunger pump (10), the third return water pipe (23), the ambient temperature water tank (12), the first outlet water pipe (24), the ambient temperature water outlet plunger pump (11), and the ambient temperature water pipe (16) are connected in sequence; the second return water pipe (21), the hot water inlet plunger pump (8), the fourth return water pipe (27), the hot water tank (13), the second outlet water pipe (28), the hot water outlet plunger pump (9), and the hot water pipe (15) are connected in sequence.

6. The cyclic load testing device for metal flexible hoses used in nuclear power plants according to claim 5, characterized in that, The circulating water pipe (14) is equipped with a pressure transmitter (17) and a temperature transmitter (18) to detect the pressure and temperature of the liquid in the metal hose (40) and transmit the data to the controller.

7. The cyclic load testing device for metal hoses used in nuclear power plants according to claim 5, characterized in that, The first return water pipe (20) is provided with a normal temperature water inlet valve (22), the normal temperature water pipe (16) is provided with a normal temperature water outlet valve (25), the second return water pipe (21) is provided with a hot water inlet valve (26), and the hot water pipe (15) is provided with a hot water outlet valve (29).

Images