Inflation sealing structure

Abstract

The utility model relates to an inflation sealing structure which comprises an upper fixing piece, a lower fixing piece, a connecting piece, an inflation nozzle, an inflation sealing ring and a sealing ring annular groove, the upper fixing piece and the lower fixing piece are respectively fixed on an assembly to be sealed, the upper fixing piece is tightly pressed on the lower fixing piece, and the upper fixing piece and the lower fixing piece are connected through the connecting piece. The sealing ring annular groove is formed in the lower surface of the upper fixing piece, the sealing ring annular groove is inflated through the inflation nozzle, the inflation sealing ring is made to be tightly attached to the lower fixing piece to complete sealing, sealing reliability can be improved, sealing can be relieved by releasing gas in the annular groove, and sealing flexibility is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solid rocket engine charging technology field, concretely relates to a kind of inflation sealing structure. BACKGROUND

[0002] The pouring system used in the pouring process of the combustion chamber of the solid rocket engine includes a secondary rubber tube valve, a secondary hopper, a pressurizing cover, a primary rubber tube valve, a primary hopper and other connecting components. Single pouring tool assembly needs to complete the sealing of at least 5 sealing surfaces. Each sealing surface is composed of a fixing part, a gasket and a bolt. The gasket is an important part of the sealing system. The quality and reliability of the gasket directly determine the quality of the product and the safety of pouring. Gasket failure can cause grain defect problems, which requires personnel to repair the defective parts, resulting in not only the consumption of manpower and resources, but also the delay of production and the increase of cost. At the same time, sealing failure can cause leakage of propellant, and the propellant slurry may seep into the gap between the contact surfaces. Once it enters the dead corner, it may cause combustion and explosion due to friction and extrusion. SUMMARY

[0003] The utility model aims at providing a kind of inflation sealing structure for propellant pouring system. The inflation sealing ring is used to realize sealing, which can improve the reliability of sealing. The gas in the release ring groove can be released to realize the release of sealing, which improves the flexibility of sealing.

[0004] The above-mentioned purpose of the utility model is realized mainly by the following technical solutions.

[0005] An inflation sealing structure includes an upper fixing part, a lower fixing part, a connecting part, an inflation nozzle, an inflation sealing ring and a sealing ring groove. The upper fixing part and the lower fixing part are fixed on the components to be sealed respectively. The upper fixing part is pressed on the lower fixing part. The upper fixing part and the lower fixing part are connected by the connecting part. The sealing ring groove is arranged on the lower surface of the upper fixing part. A through hole is provided on the upper fixing part, which is in communication with the sealing ring groove. The inflation nozzle is installed in the through hole. The inflation sealing ring is arranged in the sealing ring groove. The inflation sealing is completed by inflating the sealing ring groove through the inflation nozzle.

[0006] The inflation sealing ring is in dovetail shape. The outer surfaces of both sides are tightly fitted with the sealing ring groove. A recess is arranged in the middle of the upper surface. The lower surface is in contact with the lower fixing part.

[0007] In the inflated state, the middle part of the lower surface of the inflation sealing ring protrudes downward by 3-5 mm.

[0008] The connecting part is in ring structure. The inner wall surface is in contact with the outer surfaces of the upper fixing part and the lower fixing part. The upper part of the connecting part has a protrusion, which is arranged on the upper surface of the upper fixing part and connected with the upper fixing part. The lower part of the connecting part also has a protrusion, and a connecting column is arranged on the protrusion to connect with the lower fixing part.

[0009] The diameter of the through hole on the surface of the upper fastener is 5-10mm.

[0010] When inflated, the gas pressure in the sealing ring groove is 0.6–0.8 MPa.

[0011] Compared with the prior art, this utility model has at least the following advantages:

[0012] (1) The gas-filled sealing structure of this utility model can improve the reliability of the seal, improve product quality, and prevent leakage of medicine from the sealing surface.

[0013] (2) The gas-filled sealing structure of this utility model can effectively reduce the failure of gasket sealing. The high-pressure gas in the sealing ring groove can be released to complete the sealing release, thereby improving the flexibility of sealing. Attached Figure Description

[0014] Figure 1 This is a front view of an inflatable sealing structure according to the present invention;

[0015] Figure 2 This is a top view of an inflatable sealing structure according to the present invention;

[0016] Figure 3 This is a schematic diagram showing the inflatable sealing ring of this utility model before and after inflation. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0018] like Figure 1 and Figure 2 As shown, this utility model discloses an inflatable sealing structure for a propellant casting system, comprising an upper fixing member 1, a lower fixing member 2, a connecting member 3, an inflation nozzle 4, an inflatable sealing ring 5, and a sealing ring groove 6. The upper fixing member 1 and the lower fixing member 2 are respectively fixed to the component to be sealed, with the upper fixing member 1 pressing against the lower fixing member 2. The upper fixing member 1 and the lower fixing member 2 are connected by the connecting member 3. The sealing ring groove 6 is located on the lower surface of the upper fixing member 1, and the upper fixing member 1 has a through hole communicating with the sealing ring groove 6. The inflation nozzle 4 is installed in the through hole, and the inflatable sealing ring 5 is located within the sealing ring groove 6. Inflation is performed through the inflation nozzle 4 to fill the sealing ring groove 6, thus completing the seal. The diameter of the through hole is 5-10 mm. The inflatable sealing ring 5 is dovetail-shaped, with its outer surfaces on both sides tightly fitted to the sealing ring groove 6. A groove is provided in the middle of its upper surface, and its lower surface contacts the lower fixing member 2.

[0019] The connector 3 has a ring-shaped structure. Its inner wall surface is in contact with the outer surfaces of the upper fixing member 1 and the lower fixing member 2. The upper part of the connector 3 has a protrusion. The protrusion is located on the upper surface of the upper fixing member 1 and is connected to the upper fixing member 1. The lower part of the connector 3 also has a protrusion. A connecting post is provided on the protrusion and is connected to the lower fixing member 2.

[0020] The working principle is as follows: After the upper fixing part 1 and the lower fixing part 2 are positioned, they are locked together by the connecting part 3. Inflation is then performed through the air inlet 4 into the sealing ring groove 6. The increased pressure inside the sealing ring groove 6 causes the inflated sealing ring 5 to react. The middle part of the inflated sealing ring 5 expands outward by 3-5mm due to the pressure, tightly fitting against the lower fixing part 2, thus achieving a seal. When it is necessary to release the seal, the gas in the sealing ring groove 6 is discharged through the air inlet 4. The expanded part automatically retracts into the sealing ring groove 6, disengaging from the lower fixing part 2, thus releasing the seal. Figure 3 As shown.

[0021] In actual production, a crane is used to position the upper fixing part 1 and the lower fixing part 2. Then, the connecting part 3 is used to lock the upper fixing part 1 and the lower fixing part 2. After locking, the air supply line is connected to the air inlet 4, and compressed air is injected into the sealing ring groove 6 through the air supply line. The compressed air pressure is maintained at 0.6-0.8 MPa. The increased pressure inside the sealing ring groove 6 inflates the sealing ring 5, causing it to fit tightly against the lower fixing part 2, thus achieving a high-efficiency seal. After casting is completed, simply disconnect the air supply line from the air inlet 4. The air inlet 4 will automatically release the high-pressure gas in the sealing ring groove 6, separating it from the lower fixing part 2, thus releasing the seal.

[0022] The above description is only the best specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

[0023] The contents not described in detail in this utility model specification are common knowledge to those skilled in the art.

Claims

1. An inflatable sealing structure, characterized in that: The assembly includes an upper fixing member (1), a lower fixing member (2), a connecting member (3), an inflation nozzle (4), an inflation sealing ring (5), and a sealing ring groove (6). The upper fixing member (1) and the lower fixing member (2) are respectively fixed on the component to be sealed. The upper fixing member (1) is pressed against the lower fixing member (2). The upper fixing member (1) and the lower fixing member (2) are connected by the connecting member (3). The sealing ring groove (6) is set on the lower surface of the upper fixing member (1). The upper fixing member (1) is provided with a through hole, which communicates with the sealing ring groove (6). The inflation nozzle (4) is installed in the through hole. The inflation sealing ring (5) is set in the sealing ring groove (6). The sealing is completed by inflating the sealing ring groove (6) with air through the inflation nozzle (4).

2. The inflatable sealing structure according to claim 1, characterized in that: The inflatable sealing ring (5) is dovetail-shaped, with its outer surfaces on both sides tightly fitted to the sealing ring groove (6). A groove is provided in the middle of the upper surface, and the lower surface is in contact with the lower fixing member (2).

3. The inflatable sealing structure according to claim 2, characterized in that: When inflated, the lower surface of the inflatable sealing ring (5) protrudes downward by 3-5mm.

4. The inflatable sealing structure according to claim 1, characterized in that: The connector (3) is a ring structure. Its inner wall surface is in contact with the outer surfaces of the upper fixing member (1) and the lower fixing member (2). The upper part of the connector (3) has a protrusion. The protrusion is set on the upper surface of the upper fixing member (1) and connected to the upper fixing member (1). The lower part of the connector (3) also has a protrusion. A connecting post is set on the protrusion and connected to the lower fixing member (2).

5. The inflatable sealing structure according to claim 1, characterized in that: The diameter of the through hole on the surface of the upper fastener (1) is 5-10mm.

6. The inflatable sealing structure according to claim 1, characterized in that: Under the inflated state, the gas pressure in the sealing ring groove (6) is 0.6 to 0.8 MPa.

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