A radial adjustment and temperature change responsive seal

Abstract

The present application relates to the technical field of compressor sealing, and particularly relates to a sealing structure capable of radial adjustment and responding to temperature change, comprising a labyrinth ring, an arc-shaped sealing element, a reset assembly, a transmission element, a linkage ring and a limiting assembly, the transmission element is used for driving the limiting assembly to remove the radial limitation on the arc-shaped sealing element through the axial movement of the transmission element under the deformation force of the elastic element caused by temperature change, and at the same time, the arc-shaped sealing element is driven by the reset assembly to move radially to adjust the gap between the arc-shaped sealing element and the labyrinth ring. The sealing structure can adaptively adjust the distance between the arc-shaped sealing element and the labyrinth ring according to the temperature change, so that the gap between the labyrinth of the labyrinth ring and the matching surface of the arc-shaped sealing element can be adaptively adjusted to control the sealing gap between the compressor casing and the rotor, avoid the leakage caused by sealing failure, and improve the sealing performance.

Description

Technical Field

[0001] This invention relates to the field of compressor sealing technology, and more specifically to a sealing structure that is radially adjustable and responsive to temperature changes. Background Technology

[0002] Due to its characteristics of no contact friction, long service life, and strong adaptability to pressure and temperature, the toothed seal is widely used in compressors and axial compressors.

[0003] However, during operation, the compressor's grate rotor and stationary casing will experience inconsistent radial deformation due to thermal load disturbances, which will cause fluctuations in the sealing gap between the grate rotor and the casing, resulting in changes in the sealing gap, contact wear, or even sealing failure.

[0004] Therefore, there is a need to provide a sealing structure that is radially adjustable and responsive to temperature changes to solve the above problems. Summary of the Invention

[0005] In addressing the problem that in existing compressors, inconsistent radial deformation occurs between the toothed rotor and the stationary casing due to thermal load disturbances, leading to fluctuations in the sealing gap between the toothed rotor and the casing, resulting in changes in the sealing gap, contact wear, or even sealing failure, this invention provides a sealing structure that can be radially adjusted and responds to temperature changes to solve the existing problems.

[0006] The first aspect of the present invention provides a sealing structure that is radially adjustable and responsive to temperature changes, employing the following technical solution:

[0007] The toothed ring has a support ring fitted around its outer ring;

[0008] Multiple arc-shaped seals are evenly distributed between the support ring and the toothed ring. The ends of two adjacent arc-shaped seals are staggered to form a sealing ring. The inner arc surface of the arc-shaped seal engages with the toothed teeth on the toothed ring, and the outer arc surface of the arc-shaped seal slides radially on the support ring through a radial guide structure.

[0009] A reset assembly for resetting the arc-shaped seal in the radial direction;

[0010] The transmission component is supported between each arc-shaped seal and the support ring by support assemblies set on both ends of the support ring;

[0011] The linkage ring is axially slidably mounted on the outer ring of the toothed ring on both sides of the support assembly via an axial guide structure. The ends of the linkage ring and the transmission component are fixed. An axial compression spring is provided on the transmission component between one linkage ring and the support assembly, and an elastic component made of shape memory alloy is provided on the transmission component between the other linkage ring and the support assembly.

[0012] And a limiting component, which is disposed between the outer periphery of the transmission component and the arc-shaped seal, for limiting the radial movement of the arc-shaped seal;

[0013] The transmission component is used to drive the limiting component to release the radial restriction on the arc-shaped seal by the axial movement of the transmission component under the deformation force generated by the temperature change of the elastic component. At the same time, the arc-shaped seal moves radially under the drive of the reset component to adjust the gap between the arc-shaped seal and the toothed ring.

[0014] A further technical solution of the present invention is that the supporting component includes:

[0015] Two end rings are fixed on the two axial end faces of the support ring. Their inner rings and the outer circumferential surface of the toothed ring are fitted and fixed together, and a movable cavity is formed between the two end rings, the arc-shaped seal and the support ring.

[0016] The transmission component is located inside the movable cavity. The end of the transmission component passes through the end ring and is fixedly connected to the linkage ring. An axial compression spring is located on the transmission component between one of the linkage rings and the end ring, and an elastic element is located on the transmission component between the other linkage ring and the end ring.

[0017] A further technical solution of the present invention is that the limiting component includes:

[0018] The roller is located in the middle of the transmission component;

[0019] And a limiting bevel, which is set on the outer circumferential surface of the arc-shaped seal;

[0020] The roller is in contact with the limiting inclined surface.

[0021] A further technical solution of the present invention is that the radial guide structure includes: two first guide posts, which are evenly distributed circumferentially on the outer arc surface of the arc-shaped seal, and the first guide posts pass through the bottom surface of the radial countersunk hole of the support ring and enter the radial countersunk hole. A limit nut is provided at the end of the first guide post located in the radial countersunk hole, wherein the reset component is provided between the limit nut and the inner bottom surface of the radial countersunk hole.

[0022] A further technical solution of the present invention is that the reset assembly adopts a radial compression spring, which is sleeved on the first guide post between the limiting nut and the inner bottom surface of the guide hole.

[0023] A further technical solution of the present invention is that the cross-sectional shape of the elastic element is U-shaped, N-shaped, W-shaped, or multiple consecutive W-shaped.

[0024] A further technical solution of the present invention is to designate the bending area, which accounts for 20% of the total cross-section of the elastic element, as the deformation zone, and the other areas outside the deformation zone as the non-deformation zone; different shaped alloy materials are used between all deformation zones and between the deformation zone and the non-deformation zone.

[0025] A further technical solution of the present invention is that the axial guide structure includes: a plurality of second guide posts, which are evenly distributed in the axial direction of the end ring, and one end of the guide post facing away from the end ring is slidably connected to the movable hole provided on the linkage ring, wherein the elastic element passes through the slotted hole on the corresponding second guide post.

[0026] A further technical solution of the present invention is that when the teeth on the toothed ring are straight teeth, the inner arc surface of the arc-shaped seal corresponds to a cylindrical surface; when the teeth on the toothed ring are conical teeth, the inner arc surface of the arc-shaped seal corresponds to a conical surface; when the teeth on the toothed ring are stepped teeth, the inner arc surface of the arc-shaped seal corresponds to a stepped surface.

[0027] A further technical solution of the present invention is that the ends of the arc-shaped seals are provided with sealing teeth, the sealing teeth at the ends of the two arc-shaped seals are staggered and overlapped, and an elastic cover plate is provided at the staggered overlap.

[0028] The beneficial effects of this invention are:

[0029] 1. This invention utilizes a shape memory alloy elastic element and an axial compression spring. When the temperature changes, the elastic element deforms due to the temperature change. This deformation force drives the axial movement of the transmission component, causing the limiting assembly to release the radial restriction on the arc-shaped seal. Simultaneously, the arc-shaped seal moves radially under the drive of the reset assembly to adjust the gap between the arc-shaped seal and the toothed ring. In other words, the sealing structure of this invention can adaptively adjust the distance between the arc-shaped seal and the toothed ring according to temperature changes. This allows the clearance between the teeth of the toothed ring and the mating surfaces of the arc-shaped seal to be adaptively adjusted, controlling the sealing gap between the casing and the rotor, preventing leakage due to seal failure, and thus improving sealing performance.

[0030] 2. Secondly, this invention, by setting up a linkage ring, connects the linkage ring and all transmission components, so that when the drive transmission components move axially, the linkage ring can drive all the arc-shaped seals to move synchronously, ensuring that the diameter of the grate teeth mating cylindrical surface remains concentric throughout the process. By changing the installation position of the axial compression spring and elastic element, temperature sensing on different sides can be achieved. By changing the direction of the limiting inclined plane, positive or negative control can be achieved with temperature as input and diameter as response. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a sealing structure that is radially adjustable and responds to temperature changes according to the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure after removing the support ring, end ring, and linkage ring;

[0034] Figure 3 This is a front view of a sealing structure that is radially adjustable and responds to temperature changes according to the present invention;

[0035] Figure 4 for Figure 3 The left view;

[0036] Figure 5 for Figure 3 A partial schematic diagram of section AA in the middle;

[0037] Figure 6 for Figure 4 A partial schematic diagram of the BB section;

[0038] Figure 7 for Figure 4 A partial schematic diagram of the CC section;

[0039] Figure 8 for Figure 4 A partial schematic diagram of the DD section;

[0040] Figure 9 This is a schematic diagram of the structure of the transmission component and roller in an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the arc-shaped seal in an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the elastic element structure;

[0043] Figure 12 for Figure 11 Schematic diagram of the cross-section of the elastic element;

[0044] Figure 13 To and Figure 6 A schematic diagram of the structure of the arc-shaped seal when they are installed facing each other.

[0045] In the diagram: 1. Grate ring; 2. Support ring; 3. End ring; 4. Linkage ring; 5. Second guide post; 6. Transmission component; 7. Arc-shaped seal; 8. Radial compression spring; 9. Elastic component; 10. Axial compression spring; 21. Radial countersunk hole; 51. Thread; 61. Roller; 71. First guide post; 72. Sealing tooth; 73. Elastic cover plate; 74. Limiting slope; 75. Plane; 91. Groove hole. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0047] An embodiment of the sealing structure of the present invention, which is radially adjustable and responsive to temperature changes, is as follows: Figure 1 , Figure 3 and Figure 4 As shown, the assembly includes: a support ring 2, a reset component, a transmission component 6, a linkage ring 4, and a limiting component. The support ring 2 is sleeved on the outer ring of the toothed ring 1. Multiple arc-shaped sealing elements 7 are evenly distributed between the support ring 2 and the toothed ring 1. The ends of two adjacent arc-shaped sealing elements 7 are staggered to form a sealing ring, and the inner arc surface of the arc-shaped sealing element 7 cooperates with the teeth on the toothed ring 1 to form an adjustable gap labyrinth seal structure. The outer arc surface of the arc-shaped sealing element 7 passes through the support ring 2 through a radial guide structure. The reset component is used for the radial reset of the arc-shaped sealing elements 7. An axially oriented transmission component 6 is evenly distributed between each arc-shaped sealing element 7 and the support ring 2. The transmission component 6 is supported between the arc-shaped sealing element 7 and the support ring 2 by support components located on both ends of the support ring 2. The linkage ring 4 is axially slidably mounted on the outer ring of the toothed ring 1 on both sides of the support component through an axial guide structure. The linkage ring 4 and the transmission component 6 are fixed at the ends of the support component. An axial compression spring 10 is provided on the transmission component 6 between one linkage ring 4 and the support assembly, and an elastic element 9 made of shape memory alloy is provided on the transmission component 6 between the other linkage ring 4 and the support assembly. A limiting assembly is provided between the outer periphery of the transmission component 6 and the arc-shaped seal 7 to limit the radial movement of the arc-shaped seal 7. The transmission component 6 is driven to move axially by the deformation force generated by the elastic element 9 due to temperature changes. When the transmission component 6 moves axially, it causes the limiting assembly between the transmission component 6 and the arc-shaped seal 7 to release the radial restriction on the arc-shaped seal 7. Simultaneously, the arc-shaped seal 7 moves radially under the drive of the reset assembly to adjust the gap between the arc-shaped seal 7 and the toothed ring 1. It should be noted that the axial displacement is achieved by the combined action of the axial compression spring 10 and the elastic element 9. The axial guide structure and the linkage ring 4 are used to ensure that the displacement is applied synchronously to all transmission components 6 along the axial direction. Figure 6 As shown, the inclination angle of the limiting slope 74 of the arc-shaped seal 7 is less than 45°.

[0048] For example, such as Figure 1 , Figure 6 and Figure 7As shown, in one specific embodiment, the support assembly includes: two end rings 3, which are fixed to the two axial end faces of the support ring 2. The inner ring of the end ring 3 and the outer ring of the toothed ring 1 are fitted and fixed together, and a movable cavity is formed between the two end rings 3, the arc-shaped seal 7, and the support ring 2. A transmission member 6 is axially disposed within the movable cavity, and the end of the transmission member 6 extends through the two end rings 3 and is fixedly connected to the linkage ring 4. In this embodiment, an axial compression spring 10 is disposed on the transmission member 6 between one of the linkage rings 4 and the end ring 3, and an elastic member 9 is disposed on the transmission member 6 between the other linkage ring 4 and the end ring 3. Specifically, as shown... Figure 2 As shown, in this embodiment, two end rings 3 and twelve transmission components 6 are used. The two end rings 3 are fixed to the two ends of the support ring 2 by bolts, as shown. Figure 6 and Figure 7 As shown, the cylindrical surface of the transmission component 6 is in sliding fit with the straight holes of the two end rings 3; the end rings 3 serve as sliding constraints for the transmission component 6.

[0049] For example, such as Figure 4 and Figure 6 As shown, in one specific embodiment, the limiting component includes: a roller 61 and a limiting inclined surface 74 provided on the outer peripheral surface of the arc-shaped seal 7, wherein, as Figure 9 As shown, roller 61 is located in the middle of transmission member 6, and roller 61 is in contact with limiting inclined surface 74; as Figure 6 As shown, in this embodiment, the limiting slope 74 on the arc-shaped seal 7 slopes upwards towards the elastic member 9. When the elastic member 9 returns to its shape, it generates an expansion movement, driving the transmission member 6 to move to the right, and the arc-shaped seal 7 is pressed down, correspondingly reducing the gap between the arc-shaped seal 7 and the toothed ring 1. Figure 13 As shown, when the limiting slope 74 of the arc-shaped seal 7 slopes downwards towards the elastic member 9, the expansion movement generated by the elastic member 9 restoring its shape will drive the transmission member 6 to move to the right. Under the action of the radial compression spring 8, the arc-shaped seal 7 moves upwards, and the gap between the arc-shaped seal 7 and the toothed ring 1 increases accordingly. By setting the direction of the limiting slope 74 of the arc-shaped seal 7, the toothed gap can be adjusted in the forward or reverse direction with temperature. Under the action of the axial compression spring 10, the limiting slope 74 of the arc-shaped seal 7 is always in contact with the roller 61 of the transmission member 6. Under the action of the limiting slope 74, the axial movement of the transmission member 6 can be converted into the radial movement of the arc-shaped seal 7. In this embodiment, the inclination angle of the limiting slope 74 is 6°.

[0050] For example, such as Figure 3 and Figure 5As shown, in one specific embodiment, the radial guide structure includes: two first guide posts 71, which are evenly distributed circumferentially on the outer arc surface of the arc-shaped seal 7. Each first guide post 71 passes through the bottom surface of a radially countersunk hole 21 radially arranged in the support ring 2 and enters the radially countersunk hole 21. A limiting nut is provided at the end of each first guide post 71 located in the radially countersunk hole 21. A reset assembly is disposed between the limiting nut and the inner bottom surface of the radially countersunk hole 21. In this embodiment, the reset assembly uses a radial compression spring 8, which is sleeved on the limiting nut and the radially countersunk hole 21. On the first guide post 71 between the inner bottom surfaces of the countersunk hole 21, a washer is also provided between the contact surfaces of the radial compression spring 8 of the limiting nut; in this embodiment, there are twelve arc-shaped seals 7, the end faces of the twelve arc-shaped seals 7 are staggered and spliced ​​to form a complete sealing ring, there are twenty-four radial compression springs 8, the support ring 2 slides with the two first guide posts 71 of the arc-shaped seals 7 through two radial countersunk holes 21 with parallel axes, the arc-shaped seals 7 are subjected to the radial force generated by the radial compression springs 8, and multiple arc-shaped seals 7 together form a sealing ring with a variable inner diameter.

[0051] For example, in one specific embodiment, the cross-sectional shape of the elastic element 9 is U-shaped, N-shaped, W-shaped, or multiple consecutive W-shaped. In order to increase the temperature-deformation response range and obtain a larger displacement, the bending area accounting for 20% of the total cross-section of the elastic element 9 is designated as the deformation zone, and the other areas outside the deformation zone are designated as the non-deformation zone; different shaped alloy materials are used between all deformation zones and between the deformation zone and the non-deformation zone.

[0052] like Figure 11 and Figure 12 As shown, in this embodiment, the cross-sectional shape of the elastic element 9 is W-shaped. The outer arc surfaces at both ends of the W-shaped cross-section elastic element 9 are tangent to the axial end faces of the linkage ring 4 and the end ring 3, respectively. In this embodiment, different shape alloy materials are used between all deformation zones of the elastic element 9, and between the deformation zone and the non-deformation zone. This allows the elastic element 9 to form a composite multi-temperature zone response spring, i.e., the deformation zone of the shape memory alloy is located in the bending zone of the elastic element 9, while the straight section does not deform. For the U-shaped cross-section elastic element 9, there is only one bending zone, i.e., one deformation zone. For the N-shaped cross-section elastic element 9, there are two deformation zones, and for the W-shaped cross-section elastic element 9, there are three deformation zones. Figure 11 As shown, in this embodiment, the bending area of ​​the W-shaped cross-section elastic element 9 is used as the deformation area, such as... Figure 12As shown, the deformation zones are, in sequence, the first, second, and third deformation zones. The first deformation zone uses a nickel-titanium shape memory alloy, which completes a phase transformation when the ambient temperature rises to approximately 90°C, recovering 7% of the strain to achieve initial preload and resist the axial force of the axial compression spring 10. The second deformation zone uses a nickel-titanium-zirconium shape memory alloy, which recovers approximately 3% of the strain when the ambient temperature rises to approximately 175°C, converting it into axial displacement to achieve mid-temperature compensation. The third deformation zone uses a nickel-titanium-hafnium-lead shape memory alloy, which recovers approximately 2.5% of the strain when the ambient temperature rises to approximately 220°C, converting it into further axial displacement to achieve high-temperature compensation. In other words, the composite multi-temperature zone responsive spring in this embodiment has different recovery mechanical properties in each temperature range, thereby adapting to high and low temperature conditions and achieving continuous adaptive adjustment. In this embodiment, the W-shaped cross-section elastic element 9 is in an elastic state before reaching the minimum activation temperature and undergoes elastic compression deformation under the action of the axial compression spring 10. At this time, there is an initial gap between the arc-shaped seal 7 and the teeth of the toothed ring 1. When the temperature rises to the phase transformation temperature of the nickel-titanium shape memory alloy in the first deformation zone of the W-shaped cross-section elastic element 9, the curvature of the first deformation zone increases, the axial compression spring 10 is compressed, and the arc-shaped seal 7 produces an initial radial displacement. When the temperature continues to rise to the phase transformation temperature of the nickel-titanium-zirconium shape memory alloy in the second deformation zone of the W-shaped cross-section elastic element 9, the curvature of the second deformation zone increases, the axial compression spring 10 is compressed, and the arc-shaped seal 7 produces a radial displacement. When the temperature further rises to the phase transformation temperature of the nickel-titanium-hafnium-lead shape memory alloy in the third deformation zone, the curvature of the third deformation zone increases, the axial compression spring 10 is further compressed, and the arc-shaped seal 7 produces a further radial displacement, thus achieving continuous adjustment and control of the gap between the arc-shaped seal 7 and the teeth with temperature.

[0053] It should be noted that the axial compression spring 10 and the radial compression spring 8 are initially in a pre-compressed state. After the temperature drops to the phase change temperature of the elastic element 9, the elastic element 9 undergoes compression deformation due to the action of the axial compression spring 10. Simultaneously, the transmission component 6 generates axial displacement to drive the limiting assembly to release the limiting of the arc-shaped seal 7. At this time, the arc-shaped seal 7 is reset under the spring force of the radial compression spring 8. In this embodiment, as... Figure 6 As shown, in the initial state, the upper part of the roller 61 of the limiting assembly contacts the inner wall of the end ring 3, and the lower part of the roller 61 contacts the limiting inclined surface 74 of the arc-shaped seal 7, thus forming a radial limit. At this time, due to the action of the radial compression spring 8, the sealing ring composed of the arc-shaped seal 7 is in its maximum diameter state. When the temperature rises, the elastic element 9 expands and deforms, the axial compression spring 10 is compressed and deformed, and at the same time, the transmission element 6 generates axial displacement, which in turn drives the arc-shaped seal 7 to generate radial displacement under the spring force of the radial compression spring 8. In the fully expanded state of the elastic element 9, the roller 61 disengages from the limiting inclined surface 74 and contacts the plane 75 of the arc-shaped seal 7 to form a limit, as shown. Figure 10 As shown, at this point, further deformation of the elastic element 9 will no longer change the radial position of the arc-shaped seal 7, preventing undesirable excessive deformation from causing contact wear between the arc-shaped seal 7 and the toothed ring 1.

[0054] For example, such as Figure 4 and Figure 8 As shown, in one specific embodiment, the axial guide structure includes: a plurality of second guide posts 5, which are evenly distributed along the axial direction of the end ring 3, such as... Figure 8 As shown, in this embodiment, one end of the second guide post 5 is fixedly connected to the end ring 3 by the thread 51, and the end of the second guide post 5 away from the end ring 3 is slidably connected to the movable hole provided on the linkage ring 4. The elastic element 9 passes through the slotted hole 91 on the corresponding second guide post 5.

[0055] For example, in one specific embodiment, when the teeth on the toothed ring 1 are straight teeth, the inner arc surface of the arc-shaped seal 7 corresponds to a cylindrical surface; when the teeth on the toothed ring 1 are conical teeth, the inner arc surface of the arc-shaped seal 7 corresponds to a conical surface; when the teeth on the toothed ring 1 are stepped teeth, the inner arc surface of the arc-shaped seal 7 corresponds to a stepped surface; in this embodiment, the toothed ring 1 has straight teeth, and the inner arc surface of the arc-shaped seal 7 is a cylindrical surface.

[0056] For example, in one specific embodiment, the end of the arc-shaped seal 7 is provided with sealing teeth 72, the sealing teeth 72 at the ends of the two arc-shaped seals 7 are staggered and overlapped, and an elastic cover plate 73 is provided at the staggered overlap. Figure 10 As shown, in this embodiment, by providing sealing teeth 72 and elastic cover plates 73 on both ends of the arc-shaped seal 7, two adjacent arc-shaped seals 7 are staggered to form a sealing structure between the arc-shaped seals 7, thereby reducing gap leakage between the arc-shaped seals 7 when the diameter changes.

[0057] Working principle

[0058] I. Adjustment principle of radial sealing gap:

[0059] In compressors, when temperatures change drastically, both the tooth structure and the mating casing in the toothed seal structure undergo thermal deformation, affecting the sealing clearance. When the deformation of the tooth is greater than that of the casing, the tooth is more likely to come into contact with the casing, causing wear. Conversely, when the deformation of the casing is greater than that of the tooth, the mating clearance increases, and the sealing capacity decreases. Therefore, an active clearance control device capable of adapting to temperature changes is needed. This invention example uses multiple arc-shaped sealing elements 7 to form a radially adjustable sealing ring. The driving force for adjusting the diameter of the sealing ring comes from an elastic element 9 made of shape memory alloy. To improve the driving force level and control accuracy, a transmission element 6, rollers 61, and a limiting inclined surface 74 are used. The rollers 61 and the limiting inclined surface 74 work together to convert the axial movement of the transmission element 6 into the radial movement of the arc-shaped sealing element 7, thereby achieving adjustment of the radial clearance of the arc-shaped sealing element 7 within the range of 0.1 mm to 0.5 mm. To enable the arc-shaped seal 7 and the elastic element 9 to return to their original positions, radial compression springs 8 and axial compression springs 10 are provided radially and axially respectively. Secondly, this invention addresses the problem of increased leakage area caused by circumferential gaps between the arc-shaped seals 7 when the diameter of the adjustable sealing ring composed of multiple arc-shaped seals 7 changes, by providing sealing teeth 72 and elastic cover plates 73 on both end faces of the arc-shaped seal 7. When multiple arc-shaped seals 7 move asynchronously, the integrity of the sealing ring formed by the multiple arc-shaped seals 7 or misalignment with the toothed ring 1 can easily occur. To ensure synchronous movement of multiple arc-shaped seals 7, linkage rings 4 are provided at both ends of the transmission component 6. When the temperature changes, the elastic element 9 made of shape memory alloy generates a driving force, and all transmission components 6 move synchronously axially under the linkage of the linkage rings 4, thereby causing all arc-shaped seals 7 to move synchronously radially, achieving adjustment of the toothed sealing gap.

[0060] II. Automatic control principle of thermal response of the tooth gap:

[0061] In air compressors, positive and negative feedback control logic for temperature and clearance is required to improve sealing performance, such as... Figure 6 and Figure 13 Different temperature and gap control logics can be achieved by changing the direction of the limiting slope 74 of the arc-shaped seal 7 or the mounting side of the elastic element 9. The elastic element 9 and the axial compression spring 10 are interchangeable on the mounting side, with the mounting side of the elastic element 9 being the temperature sensing side. When the mounting structure is as follows... Figure 6 At that time, the temperature sensing side is on the right side, and because the limiting inclined plane 74 is arranged to rise on the right side, Figure 6 The mounting structure shown can sense the gas temperature on the right and implement control logic that reduces the gap between the grates as the temperature increases. When the mounting structure is as follows... Figure 13 At the same time, the temperature sensing side is also on the right side, because the limiting inclined plane 74 is arranged to descend on the right side. Figure 13The installation structure shown can sense the temperature of the gas on the right and implement control logic to increase the gap between the grates as the temperature rises. Since the elastic element 9 is made of shape memory alloy, it has continuous phase changes within different temperature ranges, thus the example structure can achieve continuous automatic gap control.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing structure that is radially adjustable and responsive to temperature changes, characterized in that, include: The toothed ring has a support ring fitted around its outer ring; Multiple arc-shaped seals are evenly distributed between the support ring and the toothed ring. The ends of two adjacent arc-shaped seals are staggered to form a sealing ring. The inner arc surface of the arc-shaped seal engages with the toothed teeth on the toothed ring, and the outer arc surface of the arc-shaped seal slides radially on the support ring through a radial guide structure. A reset assembly for resetting the arc-shaped seal in the radial direction; The transmission component is supported between each arc-shaped seal and the support ring by support assemblies set on both ends of the support ring; The linkage ring is axially slidably mounted on the outer ring of the toothed ring on both sides of the support assembly via an axial guide structure. The linkage ring and the transmission component are fixed through the end of the support assembly. An axial compression spring is provided on the transmission component between one linkage ring and the support assembly, and an elastic component made of shape memory alloy is provided on the transmission component between the other linkage ring and the support assembly. And a limiting component, which is disposed between the outer periphery of the transmission component and the arc-shaped seal, for limiting the radial movement of the arc-shaped seal; The transmission component is used to drive the limiting component to release the radial restriction on the arc-shaped seal by the axial movement of the transmission component under the deformation force generated by the temperature change of the elastic component. At the same time, the arc-shaped seal moves radially under the drive of the reset component to adjust the gap between the arc-shaped seal and the toothed ring.

2. The sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, Supporting components include: Two end rings are fixed on the two axial end faces of the support ring. Their inner rings and the outer rings of the toothed ring are fitted and fixed together, and a movable cavity is formed between the two end rings, the arc-shaped seal and the support ring. The transmission component is located inside the movable cavity. The end of the transmission component passes through the end ring and is fixedly connected to the linkage ring. An axial compression spring is located on the transmission component between one of the linkage rings and the end ring, and an elastic element is located on the transmission component between the other linkage ring and the end ring.

3. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, The limit components include: The roller is located in the middle of the transmission component; And a limiting bevel, which is set on the outer circumferential surface of the arc-shaped seal; The roller is in contact with the limiting inclined surface.

4. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, The radial guide structure includes two first guide posts, which are evenly distributed circumferentially on the outer arc surface of the arc-shaped seal. The first guide posts pass through the bottom surface of the radial countersunk hole of the support ring and enter the radial countersunk hole. A limit nut is provided at the end of the first guide post located in the radial countersunk hole. The reset component is located between the limit nut and the inner bottom surface of the radial countersunk hole.

5. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 4, characterized in that, The reset assembly uses a radial compression spring, which is sleeved on the first guide post between the limit nut and the inner bottom surface of the guide hole.

6. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, The cross-sectional shape of the elastic element is U-shaped, N-shaped, W-shaped, or multiple consecutive W-shaped.

7. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 6, characterized in that, The bending area, which accounts for 20% of the total cross-section of the elastic element, is designated as the deformation zone, and the other areas outside the deformation zone are designated as the non-deformation zone. Different alloy materials with different shapes are used between all deformation zones and between the deformation zone and the non-deformation zone.

8. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, The axial guide structure includes: multiple second guide posts, which are evenly distributed along the axial direction of the end ring, and one end of the guide post facing away from the end ring is slidably connected to a movable hole provided on the linkage ring. The elastic element passes through the slotted hole and is installed on the corresponding second guide post.

9. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, When the teeth on the toothed ring are straight teeth, the inner arc surface of the arc-shaped seal corresponds to a cylindrical surface; when the teeth on the toothed ring are conical teeth, the inner arc surface of the arc-shaped seal corresponds to a conical surface; when the teeth on the toothed ring are stepped teeth, the inner arc surface of the arc-shaped seal corresponds to a stepped surface.

10. A sealing structure that is radially adjustable and responsive to temperature changes according to claim 1, characterized in that, The ends of the arc-shaped seals are provided with sealing teeth, and the sealing teeth at the ends of the two arc-shaped seals overlap in an interlocking manner, with an elastic cover plate provided at the overlap.

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