Rocket engine combustion chamber water pressure test detection device

Abstract

The invention discloses a hydrostatic test detection device for a rocket engine combustion chamber. The hydrostatic test detection device comprises a base and a connecting plate arranged on one side of the base. A central shaft is horizontally mounted on one side of the connecting plate, the combustion chamber coaxially sleeves the central shaft, and one end of the combustion chamber is embedded into a shaft seat of the central shaft and is hermetically connected with the shaft seat; a stepped surface is formed on the outer surface of a shaft head of the central shaft, and a Y-shaped sealing ring is coaxially arranged outside the stepped surface in a sleeving manner; a pressing ring is further coaxially arranged outside the step face of the central shaft head in a sleeved mode, the inner wall of the pressing ring abuts against the Y-shaped sealing ring, and the other end of the combustion chamber is embedded into the pressing ring and connected with the pressing ring in a sealed mode. A gland for preventing the axial displacement of the compression ring is also screwed outside the shaft head of the central shaft; a closed containing space is formed among the combustion chamber, the center shaft, the pressing ring and the gland, and a water inlet channel and a water outlet channel are formed in the center shaft. The detection device can improve the sealing effect in the detection process.

Description

Technical Field

[0001] The present invention relates to a water pressure test detection device for a rocket engine combustion chamber, belonging to the technical field of water pressure detection. Background Art

[0002] After the combustion chamber of a small rocket (with a caliber below 180 mm) is formed, a water pressure resistance strength test needs to be carried out. According to a certain pressure and pressure stabilization time, it is thus judged whether the combustion chamber meets the requirements. In the existing detection process, a Y-shaped sealing ring is sleeved outside the end of the combustion chamber and cooperates with other components for sealing. However, due to the threaded surface at the end of the combustion chamber, the Y-shaped sealing ring will roll and twist during the installation process. Due to the existence of the thread and the shrinkage force of the Y-shaped sealing ring, it is difficult to adjust the Y-shaped sealing ring, and it is easy to cause wear to the Y-shaped sealing ring. If wear occurs, the overall sealing performance will be reduced, which has an adverse effect on the detection result. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a water pressure test detection device for a rocket engine combustion chamber. The end of the combustion chamber is sealed by a central shaft, a pressing ring and an O-ring. Then, the Y-shaped sealing ring is embedded into the gap between the pressing ring and the central shaft, and the Y-shaped sealing ring is limited by a gland, so that the lip-shaped end of the Y-shaped sealing ring will open outwards when subjected to water pressure, and then more closely abut against the pressing ring and the central shaft, improving the overall sealing effect.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A water pressure test detection device for a rocket engine combustion chamber includes a base and a connecting plate arranged on one side of the base; a central shaft is horizontally installed on one side of the connecting plate, and the combustion chamber is coaxially sleeved outside the central shaft and one end is embedded into the shaft seat of the central shaft and is sealingly connected with the shaft seat;

[0006] A stepped surface is formed on the outer surface of the shaft head of the central shaft. A Y-shaped sealing ring that abuts against the stepped surface and the bottom surface of the stepped surface is coaxially sleeved outside the stepped surface, and the lip-shaped side of the Y-shaped sealing ring faces the shaft seat of the central shaft;

[0007] A pressing ring is also coaxially sleeved outside the stepped surface of the shaft head of the central shaft. The inner wall of the pressing ring abuts against the Y-shaped sealing ring, and the other end of the combustion chamber is embedded into the pressing ring and is sealingly connected with the pressing ring;

[0008] A gland for preventing the axial displacement of the pressing ring is also screwed on the outer surface of the shaft head of the central shaft. The gland abuts against the pressing ring and the end part is embedded into the gap formed by the pressing ring and the stepped surface;

[0009] A sealed accommodation space is formed between the combustion chamber, the central shaft, the pressing ring and the gland, and a water inlet channel and a water outlet channel for connecting an external water supply system to the accommodation space are provided on the central shaft.

[0010] Preferably, the base and the central shaft are arranged on different sides of the connecting plate.

[0011] Preferably, corresponding annular grooves are provided on the opposite sides of the shaft seat of the central shaft and the pressing ring, and an O-ring seal is embedded in the annular grooves. The end of the combustion chamber is embedded in the corresponding annular groove on the opposite side and is in close contact with the O-ring seal.

[0012] Preferably, both the water inlet channel and the water outlet channel are provided at the shaft seat end of the central shaft, and openings corresponding to the water inlet channel and the water outlet channel are provided on the connecting plate.

[0013] The beneficial effects of the present invention are as follows:

[0014] The combustion chamber is fixed by the central shaft, the pressing ring and the gland to form an accommodation space, and then the accommodation space is sealed by the O-ring seal and the Y-ring seal. Since the Y-ring seal is embedded in the gap between the pressing ring and the central shaft and is limited by the gland, when water is passed through the accommodation space, the lip end of the Y-ring seal will open outwards under the action of water pressure and then be in closer contact with the pressing ring and the central shaft, improving the sealing effect between the pressing ring and the central shaft, so the detection effect can be improved. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of the detection device.

[0016] The meanings of the main reference numerals in the drawings are as follows:

[0017] 1. Base, 2. Connecting plate, 3. Central shaft, 4. Pressing ring, 5. Gland, 6. O-ring seal, 7. Y-ring seal. Detailed Embodiments

[0018] The present invention will be specifically introduced below with reference to the drawings and embodiments.

[0019] This embodiment provides a water pressure test detection device for a rocket engine combustion chamber, as Figure 1 shown, which includes a connecting plate 2. A base 1 is provided at the bottom of one side of the connecting plate 2, and the base 1 is fixed on a platform. A central shaft 3 is horizontally installed on the other side of the connecting plate 2. An annular groove is provided on the outer side of the shaft seat of the central shaft 3, and an O-ring seal 6 is embedded in the annular groove. The combustion chamber is coaxially sleeved outside the central shaft 3 and one end is embedded in the annular groove of the shaft seat of the central shaft 3 and is in contact with the O-ring seal 6.

[0020] The outer surface of the shaft head of the central shaft 3 is formed with a stepped surface. The shaft head outside the stepped surface is the external thread section of the central shaft 3. A Y-shaped sealing ring 7 that abuts against the stepped surface and the bottom surface of the stepped surface is coaxially sleeved outside the stepped surface. The lip-shaped side of the Y-shaped sealing ring 7 faces the shaft seat of the central shaft 3. A pressure ring 4 is also coaxially sleeved outside the stepped surface of the shaft head of the central shaft 3. The inner wall of the pressure ring 4 abuts against the Y-shaped sealing ring 7. At the same time, an annular groove corresponding to the annular sunk groove on the shaft seat of the central shaft 3 is also opened on the inner side of the pressure ring 4, and an O-shaped sealing ring 6 is also embedded in the annular sunk groove. After the pressure ring 4 is sleeved outside the central shaft 3 and the Y-shaped sealing ring 7, the other end of the combustion chamber is inserted into the annular sunk groove of the pressure ring 4 and abuts against the O-shaped sealing ring 6 inside the pressure ring 4.

[0021] In order to ensure the sealing effect between the combustion chamber, the pressure ring 4 and the shaft seat of the central shaft 3, a gland 5 is also screwed outside the shaft head of the central shaft 3. A sunk cavity is formed on the outer side of the pressure ring 4. The rear end of the gland 5 is embedded in the sunk cavity of the pressure ring 4 to squeeze the pressure ring 4, so that the outward movement of the pressure ring 4 can be prevented, and the sealing and fixing effects can be ensured. In order to prevent the external thread at the shaft head of the central shaft 3 from interfering with the Y-shaped sealing ring 7, the rear end of the gland 5 forms a deep part that is embedded in the gap between the pressure ring 4 and the stepped surface, so that the Y-shaped sealing ring 7 is restricted in the accommodating area jointly formed by the deep part, the stepped surface, the bottom surface of the stepped surface and the pressure ring 4, and the area is a smooth surface, so that the Y-shaped sealing ring 7 will not be turned over or twisted.

[0022] The O-shaped sealing ring 6 and the Y-shaped sealing ring 7 cooperate with the combustion chamber, the central shaft 3, the pressure ring 4 and the gland 5 to form a closed accommodating space. At the same time, a water inlet channel and a water outlet channel for connecting the external water supply system and the accommodating space are opened at the shaft seat end of the central shaft 3, and openings corresponding to the water inlet channel and the water outlet channel are opened on the connecting plate 2. The water inlet and outlet of the accommodating space are realized through the water inlet channel and the water outlet channel. The detection device and the external water supply system form a detection loop through a joint and a pipeline with a sealing ring. The water inlet flow rate, the water outlet flow rate and the water inlet and outlet pressures are all detected by a pressure gauge on the pipeline of the water supply system.

[0023] During the detection process, by adjusting the water inlet and outlet flow rates, the water pressure in the accommodating space is controlled within the range of 18 - 20 MPa, and it is only necessary to keep the pressure stable for a certain period of time. If the combustion chamber does not deform, it means that the product is qualified. After the accommodating space is filled with water, the lip-shaped end of the Y-shaped sealing ring 7 will open outwards under the action of water pressure, and then abut more closely against the pressure ring and the central shaft. At the same time, it is restricted in the accommodating area with a smooth surface, so it will not be turned over or twisted, ensuring the sealing effect between the pressure ring 4 and the central shaft 3.

[0024] In order to further improve the bearing capacity and compressive capacity of the detection device, the connecting plate 2, the base 1, the central shaft 3, the pressure ring 4 and the gland 5 are all made of T10 material (a kind of steel).

[0025] The above are only the preferred embodiments of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention patent, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention patent.

Claims

1. A hydrostatic test detection device for a rocket engine combustion chamber, characterized in that It includes a base and a connecting plate arranged on one side of the base; a central shaft is horizontally installed on one side of the connecting plate, and a combustion chamber is coaxially sleeved outside the central shaft, and one end thereof is embedded in the shaft seat of the central shaft and is hermetically connected to the shaft seat; A stepped surface is formed on the outer surface of the shaft head of the central shaft, and a Y-shaped sealing ring that abuts against the stepped surface and the bottom surface of the stepped surface is coaxially sleeved outside the stepped surface, and the lip-shaped side of the Y-shaped sealing ring faces the shaft seat of the central shaft; A pressing ring is also coaxially sleeved outside the stepped surface of the shaft head of the central shaft, the inner wall of the pressing ring abuts against the Y-shaped sealing ring, and the other end of the combustion chamber is embedded in the pressing ring and is hermetically connected to the pressing ring; A gland for preventing the axial displacement of the pressing ring is also screwed on the outer surface of the shaft head of the central shaft, the gland abuts against the pressing ring, and the end thereof is embedded in the gap formed between the pressing ring and the stepped surface; A closed accommodation space is formed between the combustion chamber, the central shaft, the pressing ring and the gland, and a water inlet channel and a water outlet channel for connecting an external water supply system and the accommodation space are provided on the central shaft.

2. The hydrostatic test detection device for a rocket engine combustion chamber according to claim 1, characterized in that The base and the central shaft are arranged on different sides of the connecting plate.

3. The hydrostatic test detection device for a rocket engine combustion chamber according to claim 1, characterized in that, Corresponding annular grooves are provided on the opposite sides of the shaft seat of the central shaft and the pressing ring, and an O-shaped sealing ring is embedded in the annular grooves, and the end of the combustion chamber is embedded in the corresponding annular grooves and tightly abuts against the O-shaped sealing ring.

4. The hydrostatic test detection device for a rocket engine combustion chamber according to claim 1, characterized in that, The water inlet channel and the water outlet channel are both provided at the shaft seat end of the central shaft, and openings corresponding to the water inlet channel and the water outlet channel are provided on the connecting plate.

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