A sealing structure for a combustion chamber measuring device

Abstract

This invention relates to the field of aero-engine testing technology, specifically to a sealing structure for a combustion chamber measuring device. It includes a sealing water-cooled base, a sliding plate slidably mounted on the upper surface of the base, a through hole for a test probe to pass through, an annular protrusion surrounding the through hole on the upper surface of the base, an annular mounting groove on the protrusion, and a sealing ring installed within the mounting groove. A guide groove is provided on the lower surface of the sliding plate. Limiting plates are fixedly connected to both sides of the sliding plate on the upper surface of the sealing water-cooled base. Several fixed shafts are fixedly connected to each of the two limiting plates, and limiting wheels are rotatably mounted on the fixed shafts. The limiting wheels vertically limit the sliding plate. By using the limiting wheels to roll downwards and press the sliding plate, the guide groove on the lower surface of the sliding plate and the annular protrusion on the sealing water-cooled base achieve precise alignment, resulting in uniform force on the sealing ring, minimal wear, and achieving a low-friction, high-reliability planar dynamic seal.

Description

Technical Field

[0001] This invention relates to the field of aero-engine testing technology, and more specifically to a sealing structure for a combustion chamber measuring device. Background Technology

[0002] The combustion chamber is a core hot-end component of power plants such as aero-engines and gas turbines, and its internal flow and combustion processes are extremely complex. To obtain high-precision aerodynamic and thermodynamic parameters such as flow field pressure, temperature, velocity, and component distribution within the combustion chamber, invasive test probes are typically used for contact measurements. To achieve high spatial resolution parameter acquisition within a limited space, the measuring device often needs to drive the test probe to scan and move along a preset trajectory within the measurement plane. Therefore, various planar measuring devices with displacement mechanisms have been developed in the prior art. Among these, the dynamic sealing structure between the slide plate that supports the probe and enables horizontal movement and the fixedly installed sealed water-cooled base is crucial to ensuring the long-term stable operation of the device.

[0003] In a typical combustion chamber measurement device, a sealed water-cooled mount is fixedly installed above the test section casing. A sliding plate can reciprocate on the upper surface of the sealed water-cooled mount to drive the test probe to achieve lateral or longitudinal displacement within a plane. The probe tip needs to pass through through holes in both the sliding plate and the sealed water-cooled mount and extend into the combustion chamber. Therefore, a primary sliding seal interface is formed between the lower surface of the sliding plate and the upper surface of the sealed water-cooled mount. This seal interface directly faces the pressure from the high-temperature, high-pressure combustion gases within the combustion chamber. If the seal is not tight, the high-temperature combustion gases will leak outwards along the gap between the sliding plate and the sealed water-cooled mount, severely interfering with the accuracy of the test data and potentially causing thermal damage to the displacement mechanism, drive components, and surrounding instruments, even leading to safety accidents.

[0004] To address the aforementioned planar sliding sealing problem, common existing designs include creating a sealing groove on the upper surface of the sealing water-cooling base and inserting an O-ring, relying on the weight of the sliding plate or a simple elastic clamping element to maintain contact between the sliding plate and the sealing ring. However, in practical applications, the combustion chamber testing environment is extremely harsh, requiring frequent and prolonged reciprocating motion of the sliding plate. Under repeated friction, the sealing ring is prone to wear and aging, leading to loss of preload and a rapid decline in sealing effectiveness. Furthermore, due to manufacturing and installation errors between the sliding plate and the sealing water-cooling base, as well as thermal deformation during movement, it is difficult for the lower surface of the sliding plate to maintain a uniform and stable fit with the sealing ring, easily resulting in small gaps that can lead to leakage. Existing clamping methods (such as using spring plates or bolt plates) either have uncontrollable clamping force or complex structures that hinder smooth sliding of the sliding plate over a wide range, making it difficult to simultaneously achieve good sealing and low-friction displacement performance.

[0005] Therefore, how to achieve a long-life, high-reliability dynamic seal between the slide plate and the sealing water-cooled seat under the high temperature and high pressure working conditions of the combustion chamber, while ensuring that the slide plate can smoothly perform planar displacement, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a sealing structure for a combustion chamber measuring device, and specifically discloses the following technical solutions: A sealing structure for a combustion chamber measuring device includes a sealed water-cooled base. Boat-shaped support plates are fixedly connected to both sides of the sealed water-cooled base. A sliding plate is slidably mounted on the upper surface of the sealed water-cooled base. A displacement mechanism is fixedly connected to the top of the sliding plate. A test probe is mounted on the output end of the displacement mechanism. A through hole is provided on the sealed water-cooled base for the test probe to pass through. The probe tip passes sequentially through the sliding plate and the through hole on the sealed water-cooled base. An annular protrusion is provided on the upper surface of the sealed water-cooled base around the through hole. An annular mounting groove is provided on the upper surface of the annular protrusion, and a sealing ring is installed in the mounting groove. A guide groove adapted to the annular protrusion is provided on the lower surface of the sliding plate. Limiting plates are fixedly connected to both sides of the upper surface of the sealed water-cooled base on the sliding plate. Several horizontally arranged fixed shafts are fixedly connected to the side of the two limiting plates that are close to each other. Limiting wheels are rotatably mounted on the fixed shafts, and the limiting wheels are used to limit the sliding plate in the vertical direction.

[0007] Furthermore, the sealing ring is a star-shaped sealing ring.

[0008] Furthermore, the width of the guide groove is adapted to the lateral span of the annular protrusion.

[0009] Furthermore, the fixed shafts on the limiting plate are evenly distributed in the horizontal direction.

[0010] Furthermore, the displacement mechanism includes a connecting sleeve, the bottom end of which is fixedly connected to the upper surface of the slide plate, and the top end of which is fixedly connected to a first L-shaped support. A lifting cylinder is fixedly installed on the upper surface of the first L-shaped support. The output end of the lifting cylinder is vertically upward and fixedly connected to a second L-shaped support. The test probe is installed on the side of the second L-shaped support. The probe tip passes through the through holes on the first L-shaped support, the connecting sleeve, the slide plate, and the sealing water-cooling base in sequence downward. The test probe is slidably connected to the first L-shaped support and the slide plate. One end of the first L-shaped support is hinged to the output end of a horizontal drive cylinder. The horizontal drive cylinder is fixed on a fixed plate, and the fixed plate is fixedly connected between the two boat-shaped support plates.

[0011] Furthermore, the test probe is fitted with a floating sealing sleeve, which is located inside the connecting sleeve. A spring is fixedly connected between the bottom surface of the floating sealing sleeve and the upper surface of the slide plate. An inner sealing ring is embedded in the inner wall of the floating sealing sleeve, which is used for sliding sealing between the test probe and the inner wall of the floating sealing sleeve. An outer sealing ring is embedded in the outer wall of the floating sealing sleeve, which is used for sliding sealing between the outer wall of the floating sealing sleeve and the inner wall of the connecting sleeve.

[0012] Furthermore, at least two inner sealing rings and two outer sealing rings are provided.

[0013] Furthermore, rollers are rotatably mounted on the inner walls of both sides of the guide groove, and the rollers on both sides roll on the sides of the annular protrusion.

[0014] Furthermore, the slide plate has a U-shaped water-cooling cavity inside, and the side of the slide plate has a cooling water inlet and a cooling water outlet that communicate with the water-cooling cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By using the limiting wheel to roll and press the slide plate from top to bottom, and cooperating with the guide groove on the lower surface of the slide plate to form a precise centering with the annular protrusion on the sealing water-cooling seat, the sealing ring is subjected to uniform force and has little wear, thus achieving a low-friction, high-reliability planar dynamic seal.

[0016] By incorporating a floating sealing sleeve, along with a spring, inner sealing ring, and outer sealing ring, an adaptive floating sealing structure is formed. When the test probe develops slight bending, eccentricity, or other shape defects due to machining, assembly errors, or long-term use, the floating sealing sleeve can float slightly axially under the action of the spring, always maintaining a tight fit between the inner sealing ring and the outer wall of the probe. This structure significantly reduces the stringent requirements on the straightness and coaxiality of the probe itself, effectively compensates for probe shape defects and movement deviations, avoids probe jamming or sealing failure, and greatly improves the fault tolerance and long-term operational stability of the sealing structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0018] Figure 2 This is a schematic diagram of the structure after removing the ship-shaped support plate on one side in Example 1.

[0019] Figure 3 This is a schematic diagram of the sealed water-cooled base in Example 1.

[0020] Figure 4This is a schematic diagram of the slide plate and the limiting plate in Example 1.

[0021] Figure 5 This is a schematic diagram of the internal structure of the connecting sleeve in Example 2.

[0022] Figure 6 This is a left view of the sliding plate, limiting plate, and connecting sleeve in Example 3.

[0023] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0024] 1-Sealed water-cooled base, 2-Boat-shaped support plate, 3-Slide plate, 4-Test probe, 5-Through hole, 6-Annular protrusion, 7-Mounting groove, 8-Guide groove, 9-Limiting plate, 10-Limiting wheel, 11-Connecting sleeve, 12-First L-shaped support base, 13-Lifting cylinder, 14-Second L-shaped support base, 15-Horizontal drive cylinder, 16-Floating sealing sleeve, 17-Spring, 18-Inner sealing ring, 19-Outer sealing ring, 20-Roller. Detailed Implementation

[0025] 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.

[0026] Example 1

[0027] Reference Figure 1-4 A sealing structure for a combustion chamber measuring device includes a water-cooled sealing base 1. The water-cooled sealing base 1 has an internal circulating water-cooling channel for continuous cooling of the sealing structure in a high-temperature combustion chamber environment, preventing overheating and failure of the seals. Boat-shaped support plates 2 are fixedly connected to both sides of the water-cooled sealing base 1. A sliding plate 3 is slidably mounted on the upper surface of the water-cooled sealing base 1. The sliding plate 3 can reciprocate horizontally. A displacement mechanism is fixedly connected to the top of the sliding plate 3. A test probe 4 is installed at the output end of the displacement mechanism. A through hole 5 is provided on the water-cooled sealing base 1 for the test probe 4 to pass through. The probe end of the test probe 4 passes sequentially through the sliding plate 3 and the through hole 5 on the water-cooled sealing base 1, extending into the combustion chamber to measure parameters (such as temperature, pressure, gas composition, etc.).

[0028] To achieve a dynamic seal between the slide plate 3 and the sealing water-cooled base 1, and to prevent high-temperature, high-pressure gas in the combustion chamber from leaking from the contact surface between the slide plate 3 and the sealing water-cooled base 1, an annular protrusion 6 is provided on the upper surface of the sealing water-cooled base 1 around the through hole 5. An annular mounting groove 7 is formed on the upper surface of the annular protrusion 6, and a sealing ring is installed within the mounting groove 7. A guide groove 8, adapted to the annular protrusion 6, is provided on the lower surface of the slide plate 3. The width of the guide groove 8 is adapted to the lateral span of the annular protrusion 6, ensuring that the annular protrusion 6 remains within the guide groove 8 during horizontal movement of the slide plate 3, thus providing guidance and limiting.

[0029] Limiting plates 9 are fixedly connected to both sides of the upper surface of the sealing water-cooled base 1, located on both sides of the slide plate 3. Several horizontally arranged fixed shafts are fixedly connected to the side of the two limiting plates 9 that are close to each other. Limiting wheels 10 are rotatably mounted on the fixed shafts. The limiting wheels 10 are used to limit the slide plate 3 in the vertical direction. The limiting wheels 10 adopt a rolling contact method, which provides continuous downward pressure while allowing the slide plate 3 to slide smoothly horizontally, reducing frictional resistance. Through this pre-tightening structure, the sealing ring is always pressed against the lower surface of the slide plate 3, forming a reliable airtight seal, regardless of the horizontal position of the slide plate 3.

[0030] In this embodiment, a star-shaped sealing ring is used. Compared with ordinary O-rings, star-shaped sealing rings have four lips, resulting in a larger sealing contact area. They also have stronger torsional resistance under alternating high and low temperatures and reciprocating motion conditions, making them more suitable for dynamic sealing during the reciprocating sliding of the slide plate 3.

[0031] In this embodiment, the width of the guide groove 8 is adapted to the lateral span of the annular protrusion 6, which not only prevents jamming but also avoids uneven pressure on the sealing ring caused by the swaying of the slide plate 3.

[0032] In this embodiment, several fixed shafts on the limiting plate 9 are evenly distributed in the horizontal direction. This uniform arrangement ensures that the clamping force of the limiting wheel 10 on the slide plate 3 is evenly distributed along the length of the slide plate 3, avoiding local stress concentration and ensuring that the lower surface of the slide plate 3 fits tightly with the sealing ring at each point.

[0033] In this embodiment, the displacement mechanism includes a connecting sleeve 11. The bottom end of the connecting sleeve 11 is fixedly connected to the upper surface of the slide plate 3. The top end of the connecting sleeve 11 is fixedly connected to a first L-shaped support 12. A lifting cylinder 13 is fixedly installed on the upper surface of the first L-shaped support 12. The output end of the lifting cylinder 13 is vertically upward and fixedly connected to a second L-shaped support 14. A test probe 4 is installed on the side of the second L-shaped support 14. The probe end of the test probe 4 passes through the first L-shaped support 12, the connecting sleeve 11, the slide plate 3, and the through hole 5 on the sealed water-cooled base 1 in sequence. The test probe 4 is slidably connected to the first L-shaped support 12 and the slide plate 3, allowing the probe to move up and down. One end of the first L-shaped support 12 is hinged to the output end of the horizontal drive cylinder 15, thereby avoiding the inability of the horizontal drive cylinder 15 to smoothly drive the first L-shaped support 12 to move due to installation deviation. The horizontal drive cylinder 15 is fixed on a fixed plate, and the fixed plate is fixedly connected between two boat-shaped support plates 2.

[0034] The horizontal drive cylinder 15 pushes the first L-shaped support 12 and its connected slide plate 3, lifting cylinder 13, etc., to move horizontally, thereby adjusting the horizontal position of the test probe 4 in the combustion chamber. The lifting cylinder 13 drives the test probe 4 to move up and down through the second L-shaped support 14, thereby extending or retracting the probe. The combination of these two movements allows the test probe 4 to collect data at multiple measuring points in the combustion chamber.

[0035] In this embodiment, the slide plate 3 has a U-shaped water-cooling cavity inside, and a cooling water inlet and a cooling water outlet communicating with the water-cooling cavity are provided on the side of the slide plate 3. The slide plate 3 can be connected to an external cooling water supply device through the cooling water inlet and the cooling water outlet, thereby enabling continuous cooling of the slide plate 3 and preventing the seals from overheating and failing.

[0036] Example 2

[0037] Reference Figure 5 The technical solution of this embodiment is basically the same as that of Embodiment 1, with the only difference being that a floating sealing sleeve 16 is also provided outside the test probe 4, and the floating sealing sleeve 16 is located inside the connecting sleeve 11. A spring 17 is fixedly connected between the bottom surface of the floating sealing sleeve 16 and the upper surface of the slide plate 3. An inner sealing ring 18 is embedded in the inner sidewall of the floating sealing sleeve 16, and the inner sealing ring 18 is used for sliding sealing between the test probe 4 and the inner wall of the floating sealing sleeve 16; an outer sealing ring 19 is embedded in the outer sidewall of the floating sealing sleeve 16, and the outer sealing ring 19 is used for sliding sealing between the outer wall of the floating sealing sleeve 16 and the inner wall of the connecting sleeve 11.

[0038] When the test probe 4 develops slight bending, eccentricity or other shape defects due to processing, assembly errors or long-term use, the floating sealing sleeve 16 can float slightly along the axial direction under the action of the spring 17, always maintaining the tight fit between the inner sealing ring 18 and the outer wall of the probe.

[0039] In this embodiment, at least two inner sealing rings 18 and two outer sealing rings 19 are provided. The use of multiple sealing rings arranged in series effectively enhances sealing performance. Furthermore, the multiple sealing rings serve as backups for each other, improving reliability.

[0040] Example 3

[0041] Reference Figure 6-7 The technical solution of this embodiment is basically the same as that of Embodiment 1, with the only difference being that rollers 20 are rotatably mounted on the inner walls of both sides of the guide groove 8, and the rollers 20 on both sides roll on the sides of the annular protrusion 6. When the slide plate 3 moves horizontally, the rollers 20 maintain rolling contact with the sides of the annular protrusion 6, playing a role in horizontal guidance and lateral limiting, preventing the slide plate 3 from shifting laterally during movement, ensuring that the guide groove 8 and the annular protrusion 6 are always aligned, and also reducing friction.

[0042] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A sealing structure for a combustion chamber measuring device, characterized in that, The device includes a sealed water-cooling base. Boat-shaped support plates are fixedly connected to both sides of the sealed water-cooling base. A sliding plate is slidably mounted on the upper surface of the sealed water-cooling base. A displacement mechanism is fixedly connected to the top of the sliding plate. A test probe is mounted on the output end of the displacement mechanism. A through hole is provided on the sealed water-cooling base for the test probe to pass through. The probe tip passes sequentially through the sliding plate and the through hole on the sealed water-cooling base. An annular protrusion is provided on the upper surface of the sealed water-cooling base around the through hole. An annular mounting groove is provided on the upper surface of the annular protrusion, and a sealing ring is installed in the mounting groove. A guide groove adapted to the annular protrusion is provided on the lower surface of the sliding plate. Limiting plates are fixedly connected to both sides of the upper surface of the sealed water-cooling base on the sliding plate. Several horizontally arranged fixed shafts are fixedly connected to the side of the two limiting plates that are close to each other. Limiting wheels are rotatably mounted on the fixed shafts, and the limiting wheels are used to limit the vertical movement of the sliding plate.

2. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, The sealing ring is a star-shaped sealing ring.

3. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, The width of the guide groove is adapted to the lateral span of the annular protrusion.

4. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, The fixed shafts on the limiting plate are evenly distributed in the horizontal direction.

5. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, The displacement mechanism includes a connecting sleeve, the bottom end of which is fixedly connected to the upper surface of the slide plate. A first L-shaped support is fixedly connected to the top end of the connecting sleeve. A lifting cylinder is fixedly installed on the upper surface of the first L-shaped support. The output end of the lifting cylinder is vertically upward and fixedly connected to a second L-shaped support. The test probe is installed on the side of the second L-shaped support. The probe tip passes through the through holes on the first L-shaped support, the connecting sleeve, the slide plate, and the sealing water-cooling base in sequence. The test probe is slidably connected to the first L-shaped support and the slide plate. One end of the first L-shaped support is hinged to the output end of a horizontal drive cylinder. The horizontal drive cylinder is fixed on a fixed plate, which is fixedly connected between the two boat-shaped support plates.

6. The sealing structure of the combustion chamber measuring device according to claim 5, characterized in that, The test probe is fitted with a floating sealing sleeve, which is located inside the connecting sleeve. A spring is fixedly connected between the bottom surface of the floating sealing sleeve and the upper surface of the slide plate. An inner sealing ring is embedded in the inner wall of the floating sealing sleeve, which is used for sliding sealing between the test probe and the inner wall of the floating sealing sleeve. An outer sealing ring is embedded in the outer wall of the floating sealing sleeve, which is used for sliding sealing between the outer wall of the floating sealing sleeve and the inner wall of the connecting sleeve.

7. The sealing structure of the combustion chamber measuring device according to claim 6, characterized in that, Both the inner sealing ring and the outer sealing ring are provided in at least two forms.

8. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, Rollers are rotatably mounted on the inner walls of both sides of the guide groove, and the rollers on both sides roll on the sides of the annular protrusion.

9. The sealing structure of the combustion chamber measuring device according to claim 1, characterized in that, The slide plate has a U-shaped water-cooling cavity inside, and a cooling water inlet and a cooling water outlet communicating with the water-cooling cavity are provided on the side of the slide plate.

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