Experimental device for ice blockage performance of nuclear-grade pipeline

Abstract

The utility model relates to the technical field of nuclear-grade pipeline ice blockage, in particular to a nuclear-grade pipeline ice blockage performance experimental device, which comprises a base, two groups of supporting mechanisms are fixedly mounted on the top surface of the base, an experimental pipeline is fixedly mounted at the top ends of the two groups of supporting mechanisms, the experimental pipeline is U-shaped, and one end of the experimental pipeline is connected with a pressurizing component; a freezing mechanism is further arranged on the top surface of the base, and the freezing mechanism is used for freezing the experimental pipeline at the middle position of the periphery of the experimental pipeline; after the ice plug with the preset length is formed in the experiment pipeline through the freezing mechanism, the booster pump is started, the booster pump gradually applies pressure to the experiment pipeline till the liquid level in the transparent pipeline rises, and at the moment, the pressure displayed by the booster pump is the pressure limit capable of being borne by the ice plug with the length; the length of the ice plug is changed for testing again, the relation between the length of the ice plug and the plugging performance is obtained, an accurate judgment basis is provided for ice plugging operation of a nuclear-grade pipeline, and therefore the safety of the ice plugging operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear-grade pipeline ice blocking, in particular to a nuclear-grade pipeline ice blocking performance experimental device. Background Art

[0002] During nuclear-grade pipeline maintenance work, it is necessary to isolate the medium and heat in the pipeline to reduce the safety risks of maintenance personnel during the maintenance process and ensure that the maintenance work can be carried out in a safe environment; ice blocking the pipeline is a commonly used isolation method.

[0003] At present, after ice blocking a nuclear-grade pipeline, it is usually necessary to open the upstream valve of the pipeline to allow the medium to flow, and then observe whether the medium flows out of the downstream pipeline to determine whether the pipeline is blocked, so as to determine whether the ice blocking performance is qualified.

[0004] However, the above judgment method is mainly based on the experience of the operators, and the judgment method cannot obtain accurate ice blocking performance effects. If the operators make misjudgments, medium leakage may occur during the maintenance process, thereby threatening the personal safety of the maintenance personnel. Utility Model Content

[0005] The utility model aims to provide a nuclear-grade pipeline ice blocking performance experimental device to solve the problems raised in the above-mentioned background technology.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A nuclear-grade pipeline ice blocking performance test device comprises a base, the top surface of the base is fixedly mounted with two groups of support mechanisms spaced apart in a straight line direction, the top ends of the two groups of support mechanisms are jointly fixedly mounted with a detachable test pipeline, the test pipeline is U-shaped, and one end of the test pipeline is connected with a pressurizing component;

[0008] A freezing mechanism is also arranged on the top surface of the base, and the freezing mechanism is used to freeze the experimental pipeline at the middle position of the periphery of the experimental pipeline.

[0009] Further, the pressurizing assembly includes a booster pump arranged on the top surface of the base, the water outlet end of the booster pump is fixedly connected with a second conduit, the end of the second conduit away from the booster pump is rotatably mounted with a second pipe joint, and the end of the second conduit away from the booster pump is detachably fixedly connected to one end of the experimental pipeline through the second pipe joint;

[0010] The water inlet end of the booster pump is fixedly connected with a conduit three, and one end of the conduit three away from the booster pump is connected to an external water supply device.

[0011] Furthermore, the freezing mechanism includes a freezing assembly installed in the middle of the periphery of the experimental pipeline and a freezing cylinder arranged on the top surface of the base, the pipe mouth of the freezing cylinder is fixedly connected with a conduit 1, and the end of the conduit 1 away from the freezing cylinder is fixedly installed with a pipe joint 1, and the conduit 1 is detachably connected to the freezing assembly through the pipe joint 1.

[0012] Furthermore, the freezing assembly includes two arc-shaped plates, a connecting pipe that passes through the inner side of the arc-shaped plate is fixedly installed at the middle position of the outer side of one of the arc-shaped plates, and one end of the connecting pipe away from the arc-shaped plate is detachably fixedly connected to the pipe joint;

[0013] The two sides of the arc plate are fixedly mounted with protrusions, and the two ends of the arc plate are fixedly mounted with arc baffles;

[0014] When the freezing assembly is fixedly installed on the periphery of the experimental pipeline, the two arc plates are symmetrically clamped and surrounded on the periphery of the experimental pipeline to form an outer tube structure coaxial with the experimental pipeline. The inner arc side of the arc baffle is in contact with the periphery of the experimental pipeline. There is a gap between the inner side of the arc plate and the periphery of the experimental pipeline. The two protrusions on the same side are fixedly connected by bolts.

[0015] Further, the support mechanism includes a support plate fixedly mounted on the top surface of the base, a mounting plate fixedly mounted on the top of the support plate, mounting seats fixedly mounted on both ends of the top surface of the mounting plate, a bidirectional screw rod rotatably mounted between the two mounting seats, and two guide rods symmetrically distributed about the bidirectional screw rod are fixedly connected between the two mounting seats;

[0016] Two slide seats are threadedly mounted on the periphery of the bidirectional screw rod and are symmetrically distributed about the middle position of the periphery of the bidirectional screw rod, and the slide seats are through-slidably connected with the two guide rods;

[0017] One end of the bidirectional screw rod rotates and passes through a mounting seat at a corresponding position, and a hand wheel is fixedly mounted thereon;

[0018] A support rod is fixedly installed on the top surface of the slide seat, and an arc-shaped clamping plate is fixedly installed on the top end of the support rod, and the inner arc surfaces of the two arc-shaped clamping plates are arranged opposite to each other.

[0019] Furthermore, one end of the experimental pipeline away from the pressurizing component is fixedly connected to a transparent pipeline that penetrates the experimental pipeline.

[0020] Beneficial effects of the utility model:

[0021] After forming an ice plug of preset length in the middle part of the experimental pipeline, the booster pump is started to gradually apply pressure to the experimental pipeline until the liquid level in the transparent pipeline rises. This indicates that there is leakage between the ice plug and the inner wall of the experimental pipeline. The pressure displayed by the booster pump is the pressure limit that the ice plug of this length can withstand. Then, multiple tests are carried out in sequence, and the length of the ice plug is changed during the process to obtain the relationship between the ice plug length and the plugging performance, which provides an accurate judgment basis for ice plugging operations of nuclear-grade pipelines, thereby improving the safety of ice plugging operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, a person skilled in the art can obtain other drawings based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a three-dimensional schematic diagram of the freezing assembly 7 in the utility model;

[0025] Figure 3 yes Figure 2 A three-dimensional schematic diagram from another angle;

[0026] Figure 4 It is a structural schematic diagram of the support mechanism in the utility model;

[0027] The reference numerals are as follows:

[0028] 1-base, 2-experimental pipeline, 3-support mechanism, 4-transparent pipeline, 5-freezing cylinder, 6-catheter one, 7-freezing assembly, 8-boosting pump, 9-catheter two, 10-catheter three, 11-pipe joint two, 12-pipe joint one, 13-connecting pipe, 14-arc plate, 15-arc baffle, 16-bump, 17-bolt, 18-support plate, 19-mounting plate, 20-mounting seat, 21-bidirectional screw, 22-guide rod, 23-slide seat, 24-handwheel, 26-support rod, 27-arc splint. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example:

[0031] See also Figures 1 to 4 In an embodiment of the utility model, a nuclear-grade pipeline ice blocking performance test device includes a base 1, on the top surface of the base 1 are fixedly installed two groups of support mechanisms 3 spaced apart in a straight line direction, and the tops of the two groups of support mechanisms 3 are jointly fixedly installed with a detachable test pipeline 2, the test pipeline 2 is U-shaped, and one end of the test pipeline 2 is connected to a pressurizing component;

[0032] A refrigeration mechanism is also provided on the top surface of the base 1 , and the refrigeration mechanism is used to freeze the experimental pipe 2 at the middle position of the periphery of the experimental pipe 2 .

[0033] The pressurizing assembly includes a booster pump 8 disposed on the top surface of the base 1, a water outlet end of the booster pump 8 is fixedly connected to a conduit 2 9, an end of the conduit 2 9 away from the booster pump 8 is rotatably mounted with a pipe joint 2 11, and an end of the conduit 2 9 away from the booster pump 8 is detachably fixedly connected to one end of the experimental pipeline 2 through the pipe joint 2 11;

[0034] The water inlet end of the booster pump 8 is fixedly connected with a conduit three 10, and one end of the conduit three 10 away from the booster pump 8 is connected to an external water supply device.

[0035] Among them, the freezing mechanism includes a freezing assembly 7 installed in the middle position of the periphery of the experimental pipeline 2 and a freezing cylinder 5 arranged on the top surface of the base 1. The pipe mouth of the freezing cylinder 5 is fixedly connected with a conduit 6. The end of the conduit 6 away from the freezing cylinder 5 is fixedly installed with a pipe joint 12. The conduit 6 is detachably connected to the freezing assembly 7 through the pipe joint 12.

[0036] The freezing assembly 7 includes two arc-shaped plates 14, a connecting pipe 13 that penetrates the inner side of the arc-shaped plate 14 is fixedly installed at the middle position of the outer side of one arc-shaped plate 14, and one end of the connecting pipe 13 away from the arc-shaped plate 14 is detachably fixedly connected to the pipe joint 12;

[0037] The two sides of the arc plate 14 are fixedly mounted with protrusions 16, and the two ends of the arc plate 14 are fixedly mounted with arc baffles 15;

[0038] When the freezing assembly 7 is fixedly installed on the periphery of the experimental pipe 2, the two arc plates 14 are symmetrically clamped and surrounded on the periphery of the experimental pipe 2 to form an outer tube structure coaxial with the experimental pipe 2. The inner arc side of the arc baffle 15 is in contact with the periphery of the experimental pipe 2. There is a gap between the inner side of the arc plate 14 and the periphery of the experimental pipe 2. The two protrusions 16 on the same side are fixedly connected by bolts 17.

[0039] The support mechanism 3 includes a support plate 18 fixedly mounted on the top surface of the base 1, a mounting plate 19 fixedly mounted on the top of the support plate 18, mounting seats 20 fixedly mounted on both ends of the top surface of the mounting plate 19, a bidirectional screw rod 21 rotatably mounted between the two mounting seats 20, and two guide rods 22 symmetrically distributed about the bidirectional screw rod 21 are fixedly connected between the two mounting seats 20;

[0040] Two slide seats 23 symmetrically distributed about the middle position of the periphery of the bidirectional screw rod 21 are threadedly installed on the periphery of the bidirectional screw rod 21, and the slide seats 23 are slidably connected with the two guide rods 22 through the slide seats 23;

[0041] One end of the bidirectional screw rod 21 rotates through the mounting seat 20 at the corresponding position, and a hand wheel 24 is fixedly installed;

[0042] A support rod 26 is fixedly mounted on the top surface of the slide seat 23 , and an arc-shaped clamping plate 27 is fixedly mounted on the top end of the support rod 26 . The inner arc surfaces of the two arc-shaped clamping plates 27 are arranged opposite to each other.

[0043] Among them, one end of the experimental pipeline 2 away from the pressurizing component is fixedly connected to a transparent pipeline 4 that runs through the experimental pipeline 2.

[0044] When the utility model is in use:

[0045] First, inject clean water into the experimental pipeline 2 so that the middle part of the experimental pipeline 2 is filled with water, and then open the valve of the transparent pipeline 4, so that the refrigerant in the freezing cylinder 5 flows through the conduit 16 and the connecting pipe 13 to the gap between the experimental pipeline 2 and the arc plate 14, thereby freezing the experimental pipeline 2, wherein the freezing length can be controlled by adjusting the flow of the refrigerant, and specifically, a flow meter and other equipment can be used for real-time monitoring and adjustment to ensure that the amount of liquid nitrogen flowing into the pipeline meets the demand; after the refrigerant enters the freezing component 7, a fixed cooling time is set, and then the refrigerant flow is closed in time, so as to avoid over-freezing and maintain an accurate freezing length. In actual operation, a trial freezing operation can be carried out first, and the freezing effect under different flow and time settings can be observed, and adjustments can be made according to the test results to gradually find the most suitable control parameters.

[0046] After forming an ice plug of a preset length in the middle part of the experimental pipeline 2, the booster pump 8 is started, and the booster pump 8 gradually applies pressure to the experimental pipeline 2 until the liquid level in the transparent pipeline 4 rises. This indicates that there is leakage between the ice plug and the inner wall of the experimental pipeline 2. The pressure displayed by the booster pump 8 is the pressure limit that the ice plug of this length can withstand. Then, multiple tests are carried out in sequence, and the length of the ice plug is changed during the process, so as to obtain the relationship between the ice plug length and the sealing performance, thereby providing an accurate judgment basis for the ice plugging operation of nuclear-grade pipelines, thereby improving the safety of ice plugging operations.

[0047] Among them, the material of experimental pipeline 2 is austenitic stainless steel, and two pipe diameters are selected: DN50 (wall thickness 2.77) and DN100 (wall thickness 3.05), and the length of the pipeline is about 3 meters;

[0048] Liquid nitrogen or dry ice is used as the refrigerant for the DN50 pipe, and liquid nitrogen is used as the refrigerant for the DN100 pipe. Liquid nitrogen as the refrigerant requires the ambient temperature to be <43°C and the medium temperature in the pipe to be <54°C, while dry ice as the refrigerant requires the ambient temperature to be <30°C and the medium temperature in the pipe to be <40°C.

[0049] This setting can be closer to the actual ice blockage operating environment of nuclear-grade pipelines, further improving the accuracy of the experimental results.

[0050] The support mechanism 3 drives the bidirectional screw 21 to rotate through the hand wheel 24, and synchronously drives the two slide seats 23 to slide on the guide rod 22 in a similar or divergent manner, thereby driving the two arc-shaped clamping plates 27 to clamp or loosen the experimental pipe 2. Therefore, the setting of the support mechanism 3 can be suitable for installing pipes of different specifications, and is convenient for disassembly and assembly of the pipes, thereby improving the practicality of the utility model.

[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A nuclear-grade pipeline ice blocking performance test device, comprising a base (1), characterized in that: Two groups of support mechanisms (3) are fixedly mounted on the top surface of the base (1) and are spaced apart along a straight line direction. A detachable experimental pipe (2) is fixedly mounted on the top of the two groups of support mechanisms (3). The experimental pipe (2) is U-shaped, and one end of the experimental pipe (2) is connected to a pressurizing component. A freezing mechanism is also provided on the top surface of the base (1), and the freezing mechanism is used to freeze the experimental pipe (2) at a central position of the periphery of the experimental pipe (2).

2. A nuclear-grade pipeline ice blocking performance test device according to claim 1, characterized in that: The pressurizing assembly comprises a booster pump (8) arranged on the top surface of the base (1); a water outlet end of the booster pump (8) is fixedly connected to a second conduit (9); an end of the second conduit (9) away from the booster pump (8) is rotatably mounted with a second pipe joint (11); and an end of the second conduit (9) away from the booster pump (8) is detachably fixedly connected to one end of the experimental pipeline (2) via the second pipe joint (11); The water inlet end of the booster pump (8) is fixedly connected to a conduit three (10), and the end of the conduit three (10) away from the booster pump (8) is connected to an external water supply device.

3. A nuclear-grade pipeline ice blocking performance test device according to claim 1, characterized in that: The freezing mechanism comprises a freezing assembly (7) installed at the middle position of the periphery of the experimental pipeline (2) and a freezing cylinder (5) arranged on the top surface of the base (1), the pipe mouth of the freezing cylinder (5) is fixedly connected to a conduit 1 (6), and the end of the conduit 1 (6) away from the freezing cylinder (5) is fixedly installed with a pipe joint 1 (12), and the conduit 1 (6) is detachably connected to the freezing assembly (7) through the pipe joint 1 (12).

4. A nuclear-grade pipeline ice blocking performance test device according to claim 3, characterized in that: The freezing assembly (7) comprises two arc-shaped plates (14), a connecting pipe (13) penetrating the inner side of the arc-shaped plate (14) being fixedly mounted at the middle position of the outer side of one of the arc-shaped plates (14), and an end of the connecting pipe (13) away from the arc-shaped plate (14) being detachably fixedly connected to the pipe joint 1 (12); Both sides of the arc-shaped plate (14) are fixedly mounted with protrusions (16), and both ends of the arc-shaped plate (14) are fixedly mounted with arc-shaped baffles (15); When the freezing assembly (7) is fixedly installed on the periphery of the experimental pipe (2), the two arc-shaped plates (14) are symmetrically clamped and surrounded on the periphery of the experimental pipe (2) to form an outer tube structure coaxial with the experimental pipe (2), the inner arc side of the arc-shaped baffle (15) is in contact with the periphery of the experimental pipe (2), there is a gap between the inner side of the arc-shaped plate (14) and the periphery of the experimental pipe (2), and the two protrusions (16) on the same side are fixedly connected by bolts (17).

5. The nuclear-grade pipeline ice blocking performance test device according to claim 1, characterized in that: The support mechanism (3) comprises a support plate (18) fixedly mounted on the top surface of the base (1), a mounting plate (19) fixedly mounted on the top of the support plate (18), mounting seats (20) fixedly mounted on both ends of the top surface of the mounting plate (19), a bidirectional screw rod (21) rotatably mounted between the two mounting seats (20), and two guide rods (22) symmetrically distributed about the bidirectional screw rod (21) fixedly connected between the two mounting seats (20); Two slide seats (23) are threadedly mounted on the periphery of the bidirectional screw rod (21) and are symmetrically distributed about the middle position of the periphery of the bidirectional screw rod (21), and the slide seats (23) are slidably connected to the two guide rods (22) in a through-type manner; One end of the bidirectional screw rod (21) rotates through a mounting seat (20) at a corresponding position and is fixedly mounted with a hand wheel (24); A support rod (26) is fixedly mounted on the top surface of the slide seat (23), and an arc-shaped clamping plate (27) is fixedly mounted on the top end of the support rod (26), and the inner arc surfaces of the two arc-shaped clamping plates (27) are arranged opposite to each other.

6. A nuclear-grade pipeline ice blocking performance test device according to claim 1, characterized in that: One end of the experimental pipeline (2) away from the pressurizing component is fixedly connected to a transparent pipeline (4) that penetrates the experimental pipeline (2).

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