A sample specimen fixing device under high temperature steam with high flow rate

Abstract

The application discloses a kind of high flow rate high temperature steam under sample test piece fixing device, including main rod, front support frame, rear support frame, sliding sleeve, fixed sleeve, two connecting rod mechanisms and bracing plate;Multiple groups of sample test pieces are arranged between the front support frame and the rear support frame, and the corrosion surface of the sample test piece is parallel to the flow direction of the airflow, so that both sides of the sample test piece can be simultaneously subjected to corrosion during testing.Secondly, the sliding sleeve and the fixed sleeve are connected by the two connecting rod mechanisms, the two connecting rod mechanisms are driven to bend and rotate by the sliding sleeve, the bracing plate is in abutment with the pipe wall, and the entire fixing device is fixed with the pipeline by mechanical means.The sample test piece fixing device under high flow rate high temperature steam allows it to not swing or collide violently even under the scouring of high temperature and high pressure steam flowing at high speed, and valuable experimental data of metal materials after running under actual operating conditions of power plants can be obtained.The device is low in cost, easy to operate and convenient to manufacture, and has great significance for studying the oxidation corrosion resistance of metal materials and reducing the probability of accidents caused by oxide scale.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-temperature oxidation corrosion of metal materials, and particularly relates to a sample test piece fixing device under high-temperature steam with high flow rate. BACKGROUND

[0002] The systems such as boilers and steam turbines of power plant units serve for a long time in high-temperature and high-pressure steam environment, and components such as superheater tubes, valve stems and valve sleeves of steam turbines are easily oxidized and corroded, and a relatively thick oxide layer is formed on the metal surface, and the oxide scale is easily peeled off and causes steam pipe blockage, therefore, it is of great significance to study the generation and peeling mechanism of the oxide scale for reducing a series of problems caused by the peeling of the oxide scale in power plants.

[0003] It is of great significance to carry out oxidation corrosion experiments of metal materials on the site of power plants, but in the actual operation environment of power plants, high-temperature and high-pressure steam flows at high speed in the boiler superheater pipe, and the high-speed flow has a great impact on the metal test piece, so that it is difficult to fix the metal test piece, the existing fixing device is provided with a plurality of metal test pieces fixed on the fixed rods of two supports, the support is supported on the pipe wall by a spring to be fixed, but the elastic force of the spring is difficult to control, the elastic force is too large, so that the support is inconvenient to install and disassemble in the pipe, the elastic force is too small, and the whole device is easily moved in the pipe under the impact of the high-speed airflow, and finally the whole test device is difficult to take out; in addition, since the metal test piece is sleeved on the supporting rod, the flow-attacking surface of the metal test piece is severely corroded, and the other side is less corroded. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a sample test piece fixing device under high-temperature steam with high flow rate, to solve the problem that it is difficult to fix the test piece in the pipe with high-temperature and high-pressure steam flowing at high speed in the prior art.

[0005] The present application is realized by the following technical solutions:

[0006] A sample test piece fixing device under high-temperature steam with high flow rate, comprising a main rod, a front support frame, a rear support frame, a sliding sleeve, a fixed sleeve, two connecting rod mechanisms and a support plate;

[0007] The front support frame and the rear support frame are fixedly sleeved on the main rod, and at least one group of sample test pieces are arranged between the front support frame and the rear support frame, and the corrosion surface of the sample test piece is parallel to the flow direction of the airflow;

[0008] The sliding sleeve and the fixed sleeve are sleeved on the main rod, the sliding sleeve and the fixed sleeve are connected through a plurality of double connecting rod mechanisms, and the support plate is connected with the free hinge joints of the double connecting rod mechanisms;

[0009] When the sliding sleeve moves along the axial direction of the main rod, the free hinge joints of the double connecting rod mechanisms move along the radial direction of the main rod, so that the support plate abuts against the inner wall of the pipe.

[0010] Preferably, the fixed sleeve is fixedly sleeved on the main rod and located at the end of the front support frame away from the sample test piece, and a plurality of hanging ears are circumferentially arranged on the side walls of the fixed sleeve and the sliding sleeve, and the two hanging ears of the fixed sleeve and the sliding sleeve are connected with a double-link mechanism.

[0011] Preferably, the double-link mechanism comprises two symmetrically arranged links, one end of one link is hingedly connected with the fixed sleeve, one end of the other link is hingedly connected with the sliding sleeve, and the other ends of the two links are coaxially hingedly connected with the bottom of the support plate.

[0012] Preferably, the abutting surface of the support plate is provided with a friction plate.

[0013] Preferably, the abutting surface of the support plate is provided with a ratchet, and the rotation direction of the ratchet is the same as the flow direction of the gas flow in the pipeline.

[0014] Preferably, the sliding sleeve is connected with a driving sleeve, the driving sleeve is connected with the main rod through internal threads and located at the end of the main rod, and the sliding sleeve is sleeved on the driving sleeve and axially positioned.

[0015] Preferably, the rear support frame comprises a fixed plate and a support rod.

[0016] The fixed plate is fixedly sleeved on the main rod, a plurality of support rods are circumferentially arranged on the edge of the main rod, one end of the support rod is fixedly connected with the side wall of the fixed plate, and the other end extends along the radial direction of the pipeline.

[0017] Preferably, the end of the support rod is embedded with a wave bead screw.

[0018] Preferably, the two ends of each group of sample test pieces are respectively connected with tension springs, and the two tension springs are respectively connected with the front support frame and the rear support frame.

[0019] Preferably, the pipeline is a boiler superheater pipeline or a boiler reheater pipeline.

[0020] Compared with the prior art, the present application has the following beneficial technical effects:

[0021] The present application provides a sample test piece fixing device under high flow rate and high temperature steam, which comprises a main rod, a front support frame, a rear support frame, a sliding sleeve, a fixed sleeve, a double-link mechanism and a support plate. A plurality of groups of sample test pieces are arranged between the front support frame and the rear support frame, and the corrosion surface of the sample test piece is parallel to the flow direction of the gas flow. During the test, the two sides of the sample test piece can be simultaneously corroded. The sliding sleeve drives the double-link mechanism to bend and rotate through the sliding sleeve, so that the support plate abuts against the pipe wall. The fixing of the entire fixing device and the pipeline is realized by mechanical means, which facilitates the installation and disassembly of the entire fixing device, ensures the stability of the installation, and solves the problem of movement of the existing fixing device in the pipeline. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sample fixing device of the present invention;

[0023] Figure 2 This is a schematic diagram of the linkage support assembly of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the specimen fixing assembly of the present invention;

[0025] Figure 4 This is a front view of the front support frame of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the rear support frame of the present invention.

[0027] In the diagram: 1. Main rod; 2. Connecting rod support assembly; 3. Pipe; 4. Specimen fixing assembly; 10. ; 11. Drive sleeve; 12. Sliding sleeve; 13. Nut; 14. Connecting rod; 15. Support plate; 16. Fixing sleeve; 41. Front support frame; 42. Tension spring; 43. Specimen piece; 44. Ball screw; 45. Rear support frame; 46. Support rod. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These descriptions are intended to explain the invention and not to limit it.

[0029] See Figures 1-5 A sample fixing device under high flow rate and high temperature steam includes a main rod 1, and a connecting rod support assembly 2 and a sample fixing assembly 4 disposed thereon;

[0030] The plate fixing assembly 4 includes a front support frame 41 and a rear support frame 45 that are fixedly sleeved on the main rod 1 at intervals. At least one set of sample plates is arranged between the front support frame 41 and the rear support frame 45. The corrosion surface of the sample plate 43 is parallel to the flow direction of the airflow.

[0031] The linkage support assembly 2 includes a sliding sleeve 12, a fixed sleeve 16, a two-link mechanism, and a support plate 15; the sliding sleeve 12 and the fixed sleeve 16 are sleeved on the main rod 1, and the sliding sleeve 12 and the fixed sleeve 16 are connected by multiple sets of double-link mechanisms, and the support plate 15 is connected to the free hinge point of the double-link mechanism.

[0032] When the sliding sleeve 12 can move along the axial direction of the main rod, the free hinge point of the double linkage mechanism moves radially along the main rod, which enables the support plate 15 to abut against the pipe wall, thereby fixing the sample piece in the pipe.

[0033] See Figure 2The fixed sleeve 16 is fixedly sleeved on the main rod and located at the end of the front support frame 41 away from the sample test piece. The side walls of the fixed sleeve 16 and the sliding sleeve 12 are circumferentially provided with a plurality of ear hooks which are equal in number, and the ear hooks are provided with hinge holes. The two ear hooks on the fixed sleeve 16 and the sliding sleeve 12 on the same plane are connected by a double-link mechanism.

[0034] The double-link mechanism includes two symmetrical links 14. One end of one of the links is hingedly connected to the hinge hole of the ear hook of the fixed sleeve 16, and one end of the other link is hingedly connected to the hinge hole of the ear hook of the sliding sleeve 12. The other ends of the two links are coaxially hingedly connected to the ear hooks at the bottom of the support plate 15.

[0035] When the sliding sleeve 12 slides to the side of the fixed sleeve 16, the hinged ends of the two links move radially outward, so that the support plate 15 abuts against the pipe wall, thereby achieving axial positioning of the main rod in the pipeline. When the sliding sleeve 12 slides away from the fixed sleeve 16, the hinged ends of the two links move radially along the center of the main rod, so that the support plate 15 is separated from the pipe wall.

[0036] The abutting surface of the support plate 15 is an arc surface, and the abutting surface is provided with a friction plate for increasing the friction with the inner wall of the pipeline and improving the stability of the support.

[0037] In another embodiment, the abutting surface is provided with continuous teeth arranged along the radial direction of the pipeline. The teeth are ratchets, and the rotation direction of the ratchets is the same as the flow direction of the gas in the pipeline 3. The ratchets are fixed to the inner wall of the pipeline by the ratchets, thereby improving the stability of the support of the main rod.

[0038] The sliding sleeve 12 is connected to the driving sleeve 11, which is used to drive the sliding sleeve 12 to slide along the axial direction of the main rod. The driving sleeve 11 is connected to the end of the main rod by internal threads, and the sliding sleeve 12 is axially positioned on the driving sleeve 11 by two bolts 13. When the driving sleeve 11 rotates, it can drive the sliding sleeve 12 to move along the axial direction of the main rod.

[0039] The front support frame 41 and the rear support frame 45 have the same structure. The front support frame 41 will be taken as an example for description. The front support frame 41 includes a fixed plate and a support rod 46. The fixed plate is fixedly sleeved on the main rod 1, and a plurality of support rods are circumferentially arranged on the edge of the fixed plate. One end of the support rod is fixedly connected to the side wall of the fixed plate, and the other end extends along the radial direction of the pipeline. It should be noted that the free ends of the plurality of support rods form the inner diameter of the pipeline.

[0040] The end of the support rod of the rear support frame 45 is embedded with a wave bead screw 44, which supports the rear support frame 45 in the pipeline. In combination with the link support assembly 2, the entire device is fixed.

[0041] In another embodiment, the rear support frame 45 is fixed on the main rod by screwing, and the distance between the front support frame 41 and the rear support frame 45 can be adjusted by screwing.

[0042] Two ends of each group of sample pieces are connected with the tension spring 42, and the two tension springs are connected with the support rods of the front support frame 41 and the rear support frame 45 respectively, so as to fix each group of sample pieces between the two support rods.

[0043] For example, connecting holes are formed on both sides of the sample pieces, and adjacent two sample pieces are connected by the connecting rod and the connecting hole, and adjacent two sample pieces can also be fixed by welding through the connecting piece.

[0044] The pipeline is a boiler superheater pipeline or a boiler reheater pipeline.

[0045] When the corrosion test of the sample pieces is performed, the sample pieces are fixed between the two support rods, and then one end of the rear support frame 45 is inserted into the pipeline from the mouth of the pipeline until the connecting rod support assembly 2 enters the mouth of the pipeline, at this time, the wave screw 44 supports the rear support frame 45 in the pipeline, then the rotating drive sleeve moves the sliding sleeve to one side of the fixed sleeve, the two connecting rod mechanisms make the support plate abut against the inner wall of the pipeline to realize fixation, and finally the pipeline is reset, and the high-temperature and high-pressure steam in the pipeline flows at high speed to wash and corrode the sample pieces.

[0046] The sample piece fixing device under high flow rate and high temperature steam can fix multiple metal sample pieces in the superheater pipeline at the same time, so that the metal sample pieces do not swing or collide violently even under the washing of high-temperature and high-pressure steam flowing at high speed, and valuable experimental data of the metal material after running under the actual working condition of the power plant can be obtained. The device has low cost, simple operation and is easy to manufacture, and has great significance for researching the oxidation corrosion resistance of metal materials and reducing the accident probability caused by oxide skin.

[0047] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A sample fixing device under high-flow-rate, high-temperature steam, characterized in that, The device comprises a main rod (1), a front support frame (41), a rear support frame (45), a sliding sleeve (12), a fixed sleeve (16), two connecting rod mechanisms and a support plate (15). The front support frame (41) and the rear support frame (45) are fixedly sleeved on the main rod (1), and at least one group of sample coupons is arranged between the front support frame (41) and the rear support frame (45), and the corrosion surface of the sample coupon (43) is parallel to the flow direction of the airflow. The sliding sleeve (12) and the fixed sleeve (16) are sleeved on the main rod (1), the sliding sleeve (12) and the fixed sleeve (16) are connected through a plurality of double connecting rod mechanisms, and the support plate (15) is connected with the free hinge joint of the double connecting rod mechanism. When the sliding sleeve (12) moves along the axial direction of the main rod, the free hinge joint of the double connecting rod mechanism moves along the radial direction of the main rod, so that the support plate (15) can abut against the inner wall of the pipeline. The fixed sleeve (16) is fixedly sleeved on the main rod and located at the end of the front support frame (41) away from the sample coupon, a plurality of lug ears are circumferentially arranged on the side walls of the fixed sleeve (16) and the sliding sleeve (12), and two lug ears of the fixed sleeve (16) and the sliding sleeve (12) are connected with a double connecting rod mechanism. The two connecting rod mechanisms comprise two symmetrically arranged connecting rods (14), one end of one connecting rod is hingedly connected with the fixed sleeve (16), one end of the other connecting rod is hingedly connected with the sliding sleeve (12), and the other ends of the two connecting rods are coaxially hingedly connected with the bottom of the support plate (15). The abutting surface of the support plate (15) is provided with a ratchet, and the rotation direction of the ratchet is the same as the airflow direction in the pipeline (3).

2. A high flow rate high temperature vapor sample coupon holder as defined in claim 1 wherein, The abutting surface of the support plate (15) is provided with a friction plate.

3. The high flow rate high temperature vapor sample coupon holder of claim 1, wherein, The sliding sleeve (12) is connected with a driving sleeve (11), the driving sleeve (11) is connected with the main rod through an internal thread and located at the end of the main rod, the sliding sleeve (12) is sleeved on the driving sleeve (11) and axially positioned.

4. The high flow rate high temperature vapor sample coupon holder of claim 1, wherein, The rear support frame (45) comprises a fixed plate and a support rod (46). The fixed plate is fixedly sleeved on the main rod (1), a plurality of support rods are circumferentially arranged on the edge of the main rod, one end of the support rod is fixedly connected with the side wall of the fixed plate, and the other end extends along the radial direction of the pipeline.

5. A high flow rate high temperature vapor sample coupon holder as defined in claim 4 wherein, The end of the support rod is embedded with a wave bead screw (44).

6. A high flow rate high temperature vapor sample coupon holder as defined in claim 1 wherein, Two ends of each group of sample coupons are respectively connected with a tension spring (42), and the two tension springs are respectively connected with the front support frame (41) and the rear support frame (45).

7. The high flow rate high temperature vapor sample coupon holder of claim 1, wherein, The pipeline is a boiler superheater pipeline or a boiler reheater pipeline.

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