A wear test fixture for fixing flexible metal brush filaments

Abstract

This invention provides a wear testing fixture for fixing flexible metal brush filaments, relating to the field of brush sealing technology. The fixture includes: a first brush filament folding block, a second brush filament folding block, and a base. One end of each of the first and second brush filament folding blocks has a rotating disk and an arc-shaped slide. The disk has a central hole through which a pin passes, allowing the first and second brush filament folding blocks to rotate relative to each other. The first and second brush filament folding blocks have matching grooves on opposite sides, with multiple flexible metal brush filaments located within these grooves, extending from both ends. The middle portion of each bristle can be folded and wrapped around the outside of the pin after the first and second brush filament folding blocks rotate relative to each other. After rotation and folding, the first and second brush filament folding blocks can be detachably installed within the base. This fixture facilitates the fabrication of brush filament bundles for high-speed friction testing, and compared to brush filament rings, it allows for easier observation and measurement of wear and brush filament breakage.

Description

Technical Field

[0001] This invention relates to the field of brush sealing technology, and in particular to a wear test fixture for fixing flexible metal brush filaments. Background Technology

[0002] Brush seals are a novel gas path sealing technology applicable to fields such as aero engines and steam turbines. Brush seals allow friction between the brush tips and the rotor surface, which is why brush seals have significantly lower leakage rates than toothed seals. However, wear between the brush tips and the rotor surface can increase leakage; therefore, the wear problem of brush seals has always been a major concern in the engineering field.

[0003] As can be seen from the working principle of brush seals, the friction and wear behavior between the brush bristles and the coating of the brush sealing ring, and between the brush bristles themselves, are key factors affecting the performance and lifespan of brush seals. Studying the friction and wear behavior of brush seals is of great engineering significance for ensuring their sealing effect, improving their reliability and service life.

[0004] Currently, most brush filament bundle samples are made from actual brush filament rings or a section cut from an actual brush filament ring for testing. The testing machines are mostly dynamic seal leakage test benches that can pass high-temperature and high-pressure gases and are specially designed to test sealing performance. However, even in specially built high-speed friction and wear test machines that test the coating between brush filaments and sealing rings, the brush filament bundle samples used are still sections cut from actual brush filament rings.

[0005] However, the manufacturing process of brush bristle rings is complex and costly, typically requiring specialized wire winding machines. Furthermore, brush bristle rings are irreplaceable components for testing the leakage characteristics of brush seals. When studying only the friction and wear performance and compatibility between the brush bristle material and the sealing ring coating material, or between brush bristles themselves, using actual brush bristle rings can introduce numerous inconveniences, such as making it difficult to observe and measure the wear of the bristle ring and the breakage of the brush bristles.

[0006] In view of the above reasons, the present invention provides a wear test fixture for fixing flexible metal brush filaments, which can manually wind the filaments to make brush filament bundle samples, and then use them for friction and wear behavior and matching compatibility tests between brush filaments and between brush filament bundles and sealing ring coatings in high-speed friction and wear testing machines. This solves the problems of high cost of brush filament bundles and difficulty in observing and measuring the wear of brush filament rings and brush filament breakage. Summary of the Invention

[0007] The purpose of this invention is to provide a wear test fixture for fixing flexible metal brush filaments. This fixture can solve the problems mentioned in the background art, such as the complex and costly manufacturing of brush filament rings and the difficulty in observing and measuring the wear of brush filament rings and the breakage of brush filaments.

[0008] This invention provides a wear test fixture for fixing flexible metal brush filaments, comprising: a first brush filament folding block, a second brush filament folding block, and a base. One end of the first and second brush filament folding blocks is respectively provided with two sets of rotatable turntables and arc-shaped slides. Each set of turntables has a central hole, through which a pin passes, allowing the first and second brush filament folding blocks to rotate relative to each other. Corresponding grooves are respectively formed on opposite sides of the first and second brush filament folding blocks. Multiple flexible metal brush filaments are located within the grooves, with their two ends extending from the grooves. Their middle portions can be folded and wrapped around the outside of the pin after the first and second brush filament folding blocks rotate relative to each other. After the first and second brush filament folding blocks rotate and fold relative to each other, they can be detachably installed within the base.

[0009] Preferably, the cross-section of the groove is semi-circular, and the two ends of the flexible metal brush filament extend out of the groove by equal lengths.

[0010] Preferably, the surfaces of the first and second brush bristle folding blocks away from the turntable are provided with multiple sets of mounting holes, and the two baffles are installed simultaneously with the mounting holes on the first and second brush bristle folding blocks by fasteners.

[0011] Preferably, the baffle has a semi-circular hole in the middle that matches the groove, and the flexible metal brush wire extends out from the two ends of the circular hole formed by the semi-circular holes on the two baffles after being folded in half.

[0012] Preferably, the base includes a base plate and four side plates connected thereto. Two opposite side plates are respectively provided with opening slots. The two ends of the pin extend out of the opening slots, and the ends of the pin are equipped with cotter pins.

[0013] Preferably, multiple sets of corresponding fixing screw holes are provided on the base plate and one side of the turntable. When the first brush bristle folding block and the second brush bristle folding block are rotated and folded relative to each other and installed in the base, they can be fastened by multiple fastening bolts and each set of fixing screw holes respectively.

[0014] Preferably, the turntable at the end of the first bristle folding block is disposed on the outer side of the arc-shaped slide, and the turntable at the end of the second bristle folding block is disposed on the inner side of the arc-shaped slide, and the turntable at the end of the first bristle folding block and the arc-shaped slide at the end of the second bristle folding block are rotatably engaged.

[0015] Preferably, the two turntables of the second bristle folding block are hollowed out, and the central holes on each turntable are arranged coaxially.

[0016] Preferably, the base plate is provided with mounting countersunk holes at its four corners, and the mounting countersunk holes are located on the outer side of the side plate.

[0017] Preferably, the base plate has a hollow area adapted to the turntable.

[0018] The technical solution of this invention involves setting up a first and second brush bristle folding blocks that can be rotated, folded, and opened relative to each other, with grooves inside each block to accommodate multiple flexible metal brush bristles. The middle portion of each flexible metal brush bristle is folded under the action of a pin when the first and second brush bristle folding blocks are rotated and folded, forming a brush bristle bundle with both ends extending from the same groove. After rotation and folding, the first and second brush bristle folding blocks can be detachably installed in a base. This can be used for high-speed friction tests on the ends of flexible metal brush bristles. The frictional force acts simultaneously on both ends of the same brush bristle, preventing the bristle from being pulled out during high-speed friction. Compared to using a brush bristle ring, this method allows for convenient observation and measurement of the wear and breakage of the brush bristle bundle during the test. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an overall structural diagram of the fixture of the present invention in its usage state;

[0021] Figure 2 This is a three-dimensional structural diagram of the first brush bristle folding block of the clamp of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the second brush bristle folding block of the clamp of the present invention;

[0023] Figure 4 This is a right-side schematic diagram of the first brush bristle folding block in this invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the base in this invention;

[0025] Figure 6 This is a schematic diagram of the baffle structure in this invention;

[0026] Figure 7This is a schematic diagram illustrating the steps of clamping flexible metal brush filaments using the fixture of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1: First bristle folding block; 2: Second bristle folding block; 3: Base; 301: Base plate; 302: Side plate; 4: Turntable; 401: Center hole; 5: Baffle; 501: Semicircular hole; 6: Pin; 7: Arc-shaped slide; 8: Groove; 9: Bristle bundle; 10: Mounting hole; 11: Cotter pin; 12: Fixing screw hole; 13: Mounting countersunk hole. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figure 1-7As shown, this invention provides a wear test fixture for fixing flexible metal brush filaments, comprising: a first brush filament folding block 1, a second brush filament folding block 2, and a base 3. Both the first and second brush filament folding blocks 1 and 2 are rectangular blocks. One end of each of the first and second brush filament folding blocks 1 and 2 is respectively provided with two sets of mutually rotatable turntables 4 and arc-shaped slides 7. Each set of turntables 4 has a central hole 401, and both ends of a pin 6 pass through each central hole 401, allowing the first and second brush filament folding blocks 1 and 2 to rotate relative to each other under the cooperation of the turntables 4 and the pin 6. Corresponding coaxially arranged grooves 8 are respectively formed on the middle of opposite sides of the first and second brush filament folding blocks 1 and 2. The cross-section of the groove 8... The first brush bristle folding block 1 and the second brush bristle folding block 2 are semi-circular, so that they are located in the same plane. Multiple flexible metal brush bristles are located in the groove 8 and are filled with them. The two ends of the flexible metal brush bristles extend out of the groove 8 respectively, and the lengths of the two ends are equal. The middle part of the flexible metal brush bristles can be folded and wrapped around the outside of the pin 6 after rotating the first brush bristle folding block 1 and the second brush bristle folding block 2 180° relative to each other. At this time, the semi-circular grooves 8 on the first brush bristle folding block 1 and the second brush bristle folding block 2 merge into a round hole, and the multiple flexible metal brush bristles merge into a brush bristle bundle 9, which extends out from the round hole formed after the grooves 8 merge. After rotating the first brush bristle folding block 1 and the second brush bristle folding block 2 180° relative to each other, they can be detached and installed in the base 3.

[0033] Multiple sets of mounting holes 10 are provided on the surface of the first brush filament folding block 1 and the second brush filament folding block 2 away from the turntable 4. Two baffles 5 are installed simultaneously with the mounting holes 10 on the first brush filament folding block 1 and the second brush filament folding block 2 by fasteners, thereby fixing the relative position of the first brush filament folding block 1 and the second brush filament folding block 2 and preventing them from rotating and opening. A semi-circular hole 501 adapted to the groove 8 is opened in the middle of the baffle 5. After the flexible metal brush filament is folded, its two ends extend out of the circular hole formed by the semi-circular holes 501 on the two baffles 5 and merge into a brush filament bundle 9. The brush filament bundle 9 can be used for high-speed friction test. During the test, the friction force acts on both ends of the same brush filament at the same time to prevent the brush filament from being pulled out during high-speed friction.

[0034] Specifically, the base 3 includes a base plate 301 and four side plates 302 connected thereto. The four side plates 302 are connected to form a cylindrical shape. The first bristle folding block 1 and the second bristle folding block 2 can be inserted into the top opening of the base 3 after being rotated and folded relative to each other. The two opposite side plates 302 are respectively provided with opening slots. The two ends of the pin 6 extend out of the opening slots, and the ends of the pin 6 are equipped with cotter pins 11, which can prevent the pin 6 from coming out of the center hole 401.

[0035] Multiple sets of corresponding fixing screw holes 12 are provided on the base plate 301 and one side of the turntable 4. When the first brush bristle folding block 1 and the second brush bristle folding block 2 are rotated 180° relative to each other and folded and installed in the base 3, they are fastened by multiple sets of fastening bolts and spring washers and each set of fixing screw holes 12 respectively. In this embodiment, the first brush bristle folding block 1 and the second brush bristle folding block 2 are detachably connected to the base 3 by three sets of fixing screw holes 12 and fastening bolts. The pre-tightening force of the fastening bolts can prevent the brush bristles from being pulled out during high-speed friction.

[0036] In this embodiment, the turntable 4 at the end of the first bristle folding block 1 is disposed on the outer side of the arc-shaped slide 7, and the turntable 4 at the end of the second bristle folding block 2 is disposed on the inner side of the arc-shaped slide 7. The outer periphery of the turntable 4 at the end of the first bristle folding block 1 is rotatably engaged with the arc-shaped slide 7 at the end of the second bristle folding block 2. The arc-shaped slide 7 at the end of the first bristle folding block 2 is rotatably engaged with the turntable 4 at the end of the second bristle folding block 2. By means of the pin 6 passing through the central hole 401 of each turntable 4, the first bristle folding block 1 and the second bristle folding block 2 can rotate relative to each other within the range of 0°-180°. The two rotating disks 4 of the first brush filament folding block 1 and the second brush filament folding block 2 are hollowed out, and the middle part of multiple flexible metal brush filaments can pass through the rotating disks 4 and be located on the lower side of the pin 6. The center holes 401 on each rotating disk 4 are arranged coaxially. When the first brush filament folding block 1 and the second brush filament folding block 2 rotate 180° relative to each other and fold, the middle part of multiple flexible metal brush filaments is folded and wrapped around the outside of the pin 6.

[0037] In this embodiment, mounting countersunk holes 13 are respectively provided at the four corners of the base plate 301. The mounting countersunk holes 13 are located on the outer side of the side plate 302. By cooperating with the fasteners through the mounting countersunk holes 13, the base 3, the first brush bristle folding block 1, and the second brush bristle folding block 2 can be fixed as a whole, thereby facilitating the high-speed friction test of the brush bristle bundle 9. The base plate 301 has a hollow area adapted to the turntable 4. The folded part of the brush bristle bundle 9 is located in the middle of the base plate 301, and the turntable 4 is located in the hollow areas on both sides of the base plate 301.

[0038] like Figure 7 As shown, the working principle of the fixture of the present invention is as follows:

[0039] Unfold the first bristle folding block 1 and the second bristle folding block 2 to a 180° angle. Place multiple flexible metal bristles into the grooves 8 of the first bristle folding block 1 and the second bristle folding block 2, with the flexible metal bristles passing under the pin 6. The two ends of the flexible metal bristles extend from the ends of the grooves 8 of the first bristle folding block 1 and the second bristle folding block 2, respectively, with equal extension lengths, ensuring the flexible metal bristles completely fill the grooves 8. Rotate the first bristle folding block 1 and the second bristle folding block 2 to a 180° angle, folding them together. Install the baffle 5 onto the first bristle folding block 1 and the second bristle folding block 2 using fasteners. The first brush filament folding block 1 and the second brush filament folding block 2 are fixed relative to each other by placing the folded first brush filament folding block 1 and the second brush filament folding block 2 into the base 3, and using fastening bolts and spring washers to cooperate with each set of fixing screw holes 12 to fix the first brush filament folding block 1 and the second brush filament folding block 2 to the base 3. Then, the fixture is fixed to the corresponding position of the high-speed friction and wear testing machine to conduct a high-speed friction test on the brush filament bundle 9. Since the friction position is at both ends of the metal brush filament, it can avoid the brush filament being pulled out by friction during the test.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear test fixture for fixing flexible metal brush filaments, characterized in that, include: The system comprises a first bristle folding block, a second bristle folding block, and a base. Each of the first and second bristle folding blocks has two sets of rotating disks and arc-shaped slides at one end. Each set of disks has a central hole through which a pin passes, allowing the first and second bristle folding blocks to rotate relative to each other. Corresponding grooves are formed on opposite sides of the first and second bristle folding blocks, with multiple flexible metal bristles located within these grooves, their ends extending out of the grooves, and their middle portions forming the center of the first and second bristle folding blocks. After being folded and rotated relative to each other, the first and second brush filament folding blocks are wrapped around the outside of the pin shaft. The surfaces of the first and second brush filament folding blocks away from the turntable are provided with multiple sets of mounting holes. The two baffles are installed simultaneously with the mounting holes on the first and second brush filament folding blocks by fasteners. The middle of the baffle is provided with a semi-circular hole that matches the groove. After the flexible metal brush filament is folded, its two ends protrude from the circular hole formed by the semi-circular holes on the two baffles. After being folded and rotated relative to each other, the first and second brush filament folding blocks can be detachably installed in the base.

2. The wear test fixture for fixing flexible metal brush filaments according to claim 1, characterized in that, The groove has a semi-circular cross-section, and the two ends of the flexible metal brush filament extend out of the groove by equal lengths.

3. The wear test fixture for fixing flexible metal brush filaments according to claim 1, characterized in that, The base includes a base plate and four side plates connected thereto. Two opposite side plates are provided with opening slots. The two ends of the pin extend out of the opening slots, and the ends of the pin are fitted with cotter pins.

4. The wear test fixture for fixing flexible metal brush filaments according to claim 3, characterized in that, Multiple sets of corresponding fixing screw holes are provided on the base plate and one side of the turntable. When the first brush bristle folding block and the second brush bristle folding block are rotated and folded relative to each other and installed in the base, they can be fastened by multiple fastening bolts and each set of fixing screw holes respectively.

5. The wear test fixture for fixing flexible metal brush filaments according to claim 1, characterized in that, The turntable at the end of the first bristle folding block is disposed on the outer side of the arc-shaped slide, and the turntable at the end of the second bristle folding block is disposed on the inner side of the arc-shaped slide. The turntable at the end of the first bristle folding block and the arc-shaped slide at the end of the second bristle folding block are rotatably engaged.

6. The wear test fixture for fixing flexible metal brush filaments according to claim 5, characterized in that, The two turntables of the second brush bristle folding block are hollowed out, and the central holes on each turntable are arranged coaxially.

7. The wear test fixture for fixing flexible metal brush filaments according to claim 3, characterized in that, The base plate has mounting countersunk holes at its four corners, and the mounting countersunk holes are located on the outer side of the side plate.

8. The wear test fixture for fixing flexible metal brush filaments according to claim 3, characterized in that, The base plate has a hollowed-out area that is compatible with the turntable.

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