Clamp for creep test in high-pressure steam environment

Abstract

The utility model relates to a clamp for a creep test in a high-pressure steam environment, which is characterized by comprising a sealing pipe sleeve, a temperature control cavity capable of accommodating a test piece is arranged in the sealing pipe sleeve, and fixing rods which extend into the temperature control cavity and are used for fixing the test piece are respectively arranged at two ends of the sealing pipe sleeve in a penetrating manner; a steam inlet pipe and a steam exhaust pipe which are communicated with the temperature control cavity are arranged on the side portion of the sealing pipe sleeve. The clamp for the creep experiment in the high-pressure steam environment is novel in structure, reasonable in design and capable of carrying out the creep experiment on a test piece in the high-pressure steam environment, the test efficiency and the data reliability are remarkably improved, and remarkable technical advantages are brought to scientific research and industrial application.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment, and in particular to a fixture for creep experiments under high-pressure steam environment. Background Technology

[0002] Currently, thermal power generating units account for more than 50% of the total capacity in my country. However, due to the influence of high-temperature creep, boiler high-temperature steam pipelines are prone to failure due to the expansion of defects, which brings great safety hazards.

[0003] Creep testing is an important method for studying the deformation of materials over time under high temperature or stress conditions. Existing creep testing equipment is only suitable for atmospheric pressure air environments. It suffers from technical defects such as sealing failure, large pressure fluctuations, and easy corrosion of fixtures in high-pressure steam environments, making it unsuitable for use in high-pressure steam environments. This limits the types of tests that can be conducted and makes it impossible to perform creep experiments under high-pressure steam environments. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a novel and versatile fixture for creep experiments under high-pressure steam environment, which can perform creep experiments on specimens under high-pressure steam environment, and significantly improves test efficiency and data reliability.

[0005] This utility model is achieved by the following scheme: a fixture for creep experiments under high pressure steam environment, including a sealing sleeve, the inside of which is provided with a temperature control cavity that can accommodate the test piece, and fixing rods that extend into the temperature control cavity to fix the test piece at both ends of the sealing sleeve, and a steam inlet pipe and a steam exhaust pipe that are connected to the temperature control cavity on the side of the sealing sleeve.

[0006] Furthermore, the end of the fixing rod that extends into the temperature control cavity is provided with a first threaded portion for connecting the test piece.

[0007] Furthermore, the end of the fixing rod extending out of the sealing sleeve is provided with a second threaded portion.

[0008] Furthermore, the steam inlet pipe and the steam outlet pipe are equipped with solenoid valves.

[0009] Furthermore, the side of the sealing sleeve is also provided with a pressure measuring tube that communicates with the temperature control cavity, and a pressure gauge is connected to the outward end of the pressure measuring tube.

[0010] Furthermore, the sealing sleeve is composed of two threaded sections connected together.

[0011] Furthermore, a sealing knob that is threadedly connected to the end of the sealing sleeve is fixedly connected to the rod segment of the fixing rod extending out of the sealing sleeve.

[0012] Furthermore, the upper and lower end faces of the sealing sleeve are provided with grooves, the inner wall of the groove is provided with internal threads, and the outer periphery of the sealing knob is provided with external threads that connect with the groove threads.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The fixture structure of the present invention for creep experiments under high pressure steam environment is novel and reasonably designed, which can carry out creep experiments on specimens under high pressure steam environment, significantly improves test efficiency and data reliability, has good versatility, is applicable to more test types, and brings significant technical advantages to scientific research and industrial applications.

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0015] Figure 1 This is an external view of the fixture according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the fixture according to an embodiment of the present invention;

[0017] Figure 3 This is a flowchart of the air pressure control process according to an embodiment of this utility model;

[0018] The following are the labels in the diagram: 1. Sealing sleeve; 2. Steam exhaust pipe; 3. Steam inlet pipe; 4. Normally closed solenoid valve; 5. Normally open solenoid valve; 6. Pressure gauge; 7. Sealing knob; 8. Fixing rod; 9. First threaded part. Detailed Implementation

[0019] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] like Figures 1-3As shown, a fixture for creep experiments under high-pressure steam conditions includes a sealed sleeve 1. The sealed sleeve 1 has a temperature-controlled cavity inside that can accommodate the specimen. Fixing rods 8, extending into the temperature-controlled cavity to fix the specimen, are respectively inserted at both ends of the sealed sleeve 1. A steam inlet pipe 3 and a steam exhaust pipe 2, connected to the temperature-controlled cavity, are located on the side of the sealed sleeve 1. The steam inlet pipe is connected to a steam supply pipeline. This fixture enables creep experiments on specimens under high-pressure steam conditions, significantly improving experimental efficiency and data reliability, and bringing significant technical advantages to scientific research and industrial applications.

[0022] In this embodiment, the fixed rod 8 has a first threaded part 9 at one end that extends into the temperature control cavity for connecting the test piece. The first threaded part 9 is used to connect the test piece.

[0023] In this embodiment, the end of the fixing rod extending out of the sealing sleeve is provided with a second threaded part, and the clamp is fixed to the external creep testing machine through the second threaded part on the fixing rod.

[0024] In this embodiment, the steam inlet pipe and the steam outlet pipe are equipped with solenoid valves (i.e., normally closed solenoid valve 4 and normally open solenoid valve 5), wherein the normally closed solenoid valve 4 is installed on the steam outlet pipe 2 and the normally open solenoid valve 5 is installed on the steam inlet pipe 3.

[0025] In this embodiment, the side of the sealing sleeve is also provided with a pressure measuring tube connected to the temperature control chamber, and a pressure gauge 6 is connected to the outward end of the pressure measuring tube. This facilitates the control of the gas pressure inside the sealing sleeve. When the pressure inside the sealing sleeve is higher than the preset high pressure, it will be depressurized through the steam exhaust pipe; when the pressure is lower than the preset low pressure, it will be replenished through the steam inlet pipe. Gas pressure regulation can effectively reduce gas pressure fluctuations and improve the overall performance of the equipment.

[0026] In this embodiment, the sealing sleeve is composed of two threaded sections, and the sealing sleeve adopts a separable design for easy loading and unloading of the creep sample. To improve sealing performance, a sealing ring is provided at the connection between the two sections of the sealing sleeve. The lower opening of the upper section of the sealing sleeve is provided with an internal thread, and the upper opening of the lower section of the sealing sleeve is provided with a threaded connection part that can extend into the lower opening of the upper section.

[0027] In this embodiment, a sealing knob that is threadedly connected to the end of the sealing sleeve is fixedly connected to the rod segment of the fixing rod extending out of the sealing sleeve.

[0028] In this embodiment, the upper and lower end faces of the sealing sleeve are provided with recesses, the depth of which is 2±0.1mm. The inner wall of the recess is provided with internal threads, and the outer periphery of the sealing knob is provided with external threads that connect with the threads of the recess. To improve the sealing performance, a sealing gasket is provided inside the recess.

[0029] In this embodiment, the sealing sleeve is forged from alloy steel with a wall thickness of 12-15 mm and circumferential reinforcing ribs spaced 50 mm apart on the inner wall. To make the fixture more adaptable to high-pressure steam environments, the connection between the fixing rod and the specimen is set as a simple and durable threaded clamping structure. The fixture surface is plated with a hard chrome layer to resist high-temperature steam corrosion.

[0030] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0031] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0032] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0033] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A fixture for creep experiments under high-pressure steam environment, characterized in that: The device includes a sealing sleeve with a temperature control cavity inside that can accommodate the test specimen. Fixing rods that extend into the temperature control cavity to fix the test specimen are respectively inserted at both ends of the sealing sleeve. A steam inlet pipe and a steam exhaust pipe connected to the temperature control cavity are provided on the side of the sealing sleeve.

2. The fixture for creep testing under high-pressure steam environment according to claim 1, characterized in that: The fixed rod extends into the temperature control cavity and has a first threaded part at one end for connecting the test piece.

3. The fixture for creep testing under high-pressure steam environment according to claim 2, characterized in that: The fixed rod has a second threaded part at one end extending out of the sealing sleeve.

4. The fixture for creep testing under high-pressure steam environment according to claim 1, characterized in that: Solenoid valves are installed on the steam inlet pipe and the steam outlet pipe.

5. The fixture for creep testing under high-pressure steam environment according to claim 1, characterized in that: The side of the sealing sleeve is also provided with a pressure measuring tube that communicates with the temperature control cavity, and a pressure gauge is connected to the outward end of the pressure measuring tube.

6. The fixture for creep testing under high-pressure steam environment according to claim 1, characterized in that: The sealing sleeve is made of two threaded sections connected together.

7. The fixture for creep testing under high-pressure steam environment according to claim 1, characterized in that: A sealing knob, which is threaded to the end of the sealing sleeve, is fixedly connected to the section of the fixed rod extending out of the sealing sleeve.

8. The fixture for creep testing under high-pressure steam environment according to claim 7, characterized in that: The upper and lower end faces of the sealing sleeve are provided with grooves, the inner wall of the groove is provided with internal threads, and the outer periphery of the sealing knob is provided with external threads that connect with the groove threads.

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