Inflation and vacuumizing test device for composite hood
By designing a composite head cover testing device including sealing testing, vacuuming and inflation systems, the problems of low demand for composite head cover airtight tests and low device usage in the prior art are solved, and high efficiency and low cost Airtight test improves measurement accuracy and flexibility.
Patent Information
- Application Number
- CN202421267307.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-06-05
AI Technical Summary
In the prior art, the demand for airtight tests of composite head covers is small and the device usage rate is low, which makes it impossible to effectively verify the sealing performance of the head covers, affecting missile performance and reliability.
A composite head hood inflation and vacuum testing device including sealed testing system, vacuum evacuation system and inflation system was designed. A nitrogen gas cylinder is used as the gas source and a vacuum pump is used as the power source. It is closed-loop control through the ball valve and the pressure regulating valve. Pressure gauge provides feedback, simplifying the structure and reducing excess connections for improved measurement accuracy.
It realizes efficient and low-cost airtight tests, improves measurement accuracy and device flexibility, and can design closed tooling sizes according to different hood requirements, while simplifying the maintenance process.
Smart Images
Figure CN222353463U_ABST
Abstract
Description
[0001] The utility model relates to the field of missile hoods, in particular to a device for testing the inflation and vacuuming of a composite hood. Background Art
[0002] In the prior art, the hood is one of the important parts of the missile. It is installed outside the missile seeker antenna. As a protective cover, it directly affects the missile performance. Because it is located at the front end of the missile, the hood needs to have an excellent aerodynamic shape and provide thermal protection to provide a suitable environment for the normal operation of its internal equipment. Composite materials are used as the preparation material of the hood because of their superior performance compared to single materials, so as to promote the development of high performance and high reliability of missile hoods.
[0003] In order to ensure that the composite hood is of qualified quality during the identification stage, an airtight test is carried out on it to verify whether the sealing performance of the hood meets the specified technical requirements. A special composite hood inflation and vacuum testing device needs to be built.
[0004] The airtightness test requirements vary according to the actual environmental conditions and product structural parameters. The survey found that the demand for airtightness testing of a single product is small and the utilization rate of the device is low. Therefore, it is necessary to invent a low-cost, efficient and flexible composite hood inflation and vacuum testing device to conduct special product airtightness testing. Utility Model Content
[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an inflation and vacuum testing device for a composite hood.
[0006] According to the technical solution provided in the embodiment of the present application, a composite hood inflation and vacuum testing device includes a sealing test system, a vacuum system and an inflation system. The sealing test system includes a composite hood, a sealing gasket, a closed tooling, a pressure-resistant main pipeline, a pressure gauge, a ball valve and a three-way joint. The composite hood is provided with a semicircular sealing hood. The composite hood and the sealing gasket are fixed to the closed tooling by screws distributed in a circumferential array. A hollow chamber is reserved between the composite hood and the closed tooling. The closed tooling is threadedly connected to the pressure-resistant main pipeline. The pressure-resistant main pipeline is provided with screws. The ball valve is threadedly connected, the pressure-resistant main pipeline is threadedly connected to the upper end of the three-way joint, the vacuum system includes a pressure regulating valve, a pressure-resistant branch pipeline a and a vacuum pump, the right end of the three-way joint is threadedly connected to one side of the pressure-resistant branch pipeline a, and the other side of the pressure-resistant branch pipeline a is threadedly connected to the vacuum pump, the pressure-resistant branch pipeline a is provided with a pressure-regulating valve with two ends threaded, the inflation system includes a pressure-resistant branch pipeline b, a gas cylinder regulating valve and a nitrogen cylinder, the left end of the three-way joint is threadedly connected to the pressure branch pipeline b, the pressure-resistant branch pipeline b is threadedly connected to the gas cylinder regulating valve, and the gas cylinder regulating valve is threadedly connected to the nitrogen cylinder.
[0007] In the utility model, further, a threaded through hole is provided on one side of the closed tooling and extends into the hollow chamber of the composite hood.
[0008] In the utility model, further, the pressure gauge is screwed to the pressure-resistant main pipeline, and the pressure gauge is located between the closing tooling and the ball valve.
[0009] In the utility model, further, a control handle is provided on the ball valve.
[0010] In the utility model, further, the pressure regulating valve is located between the right end of the three-way joint and the vacuum pump.
[0011] In the present invention, further, the three-way connector is an inverted T-shaped hollow connector.
[0012] In summary, the beneficial effects of the present application are as follows: when the device is in use, a nitrogen gas cylinder is selected as the gas source for the airtight test in the inflation mode, the gas cylinder regulating valve and the ball valve on the main pressure-resistant pipeline are used as the control part, the vacuum pump is used as the power source for vacuuming, the regulating valve and the ball valve on the main pressure-resistant pipeline are used as the control part, and the pressure gauge is used as a feedback mechanism for closed-loop control. The device has a simple structure, high reliability and convenient maintenance. When the pressure gauge detects the pressure of the composite hood, the main pressure-resistant pipeline to be measured is shorter, and there are no redundant connecting joints and valves in the middle, which improves the measurement accuracy, can save costs and achieve accurate measurement results. At the same time, the corresponding closed tooling size can be designed according to different hood requirements, but the closed tooling pipeline interface remains consistent. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0014] Figure 1 Schematic diagram of the structure for inflating and vacuuming the composite hood;
[0015] Figure 2 Schematic diagram of the detailed structure of the composite hood.
[0016] Numbers in the figure:
[0017] 1-composite hood; 2-sealing pad; 3-closing tooling; 4-pressure main pipeline; 5-pressure gauge; 6-ball valve; 7-tee joint; 8-pressure regulating valve; 9-pressure branch pipeline a; 10-vacuum pump; 11-pressure branch pipeline b; 12-gas cylinder regulating valve; 13-nitrogen cylinder. DETAILED DESCRIPTION
[0018] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.
[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0020] like Figure 1 As shown, the present application is a composite hood inflation and vacuum testing device, which consists of a composite hood 1, a sealing pad 2, a sealing tool 3, a pressure-resistant main pipeline 4, a pressure gauge 5, a ball valve 6, a three-way joint 7, a pressure regulating valve 8, a pressure-resistant branch pipeline a9, a vacuum pump 10, a pressure-resistant branch pipeline b11, a gas cylinder regulating valve 12, a nitrogen gas cylinder 13, etc.;
[0021] like Figure 1 As shown, a sealing gasket 2 is provided under the composite head cover 1, and is connected to the closed tooling 3 by screws distributed in a circumferential array. Eight screws evenly distributed in the circumferential direction are symmetrically and synchronously tightened upward from the countersunk holes on the bottom surface of the closed tooling 3. A hollow chamber is provided between the closed tooling 3 and the composite head cover 1. A threaded through hole is provided on one side of the closed tooling 3 and extends into the hollow chamber of the composite head cover 1. A main pressure-resistant pipeline 4 is threadedly connected to one side of the closed tooling 3. A pressure gauge 5 and a ball valve 6 are connected to the main pressure-resistant pipeline 4. The pressure gauge is located between the closed tooling 3 and the ball valve 6. The pressure value is measured according to the pressure gauge 5 to reach the specified pressure value. After slowly reaching the specified value, the pressure is maintained to perform an airtight test. The closed tooling 3 is threadedly connected to the upper end of the three-way joint 7, the right end of the three-way joint 7 is threadedly connected to the pressure-resistant branch pipe a9, and the left end is threadedly connected to the pressure-resistant branch pipe b11. The pressure-resistant branch pipe a9 is threadedly connected to the vacuum pump 10. The pressure-resistant branch pipe a9 is provided with a pressure-regulating valve 8 with threaded connections at both ends. The pressure-resistant branch pipe b11 is threadedly connected to the gas cylinder regulating valve 12, and the gas cylinder regulating valve 12 is threadedly connected to the nitrogen cylinder 13.
[0022] The three-way connector 7 is divided into two branches, which are threadedly connected to the pressure branch pipe a9 and the pressure branch pipe b11 respectively. The valves set on the two branches are opened and closed to alternately perform the inflation and vacuuming modes. The inflation system and the vacuuming system share the ball valve 6, the pressure gauge 5 and the pressure main pipe 4 on the main pipe. In the inflation mode, the nitrogen cylinder 13 is selected as the gas source for the airtight test, the cylinder regulating valve 12 and the ball valve 6 on the pressure main pipe 4 are used as the control part. In the vacuuming mode, the vacuum pump 10 is used as the power source, the regulating valve 8 and the ball valve 6 on the pressure main pipe 4 are used as the control part, and the pressure gauge 5 is used as a feedback mechanism for closed-loop control.
[0023] After the installation is completed as described above, conduct the test, close the regulating valve 8 and open the ball valve 6 on the main pressure-resistant pipeline 4, then slowly open the gas cylinder regulating valve 12 to fill in nitrogen, check whether there is leakage in the overall test device during the charging process, if there is, eliminate the leakage point in time, if not, continue the test, slowly inflate until the pressure gauge 5 measures the specified pressure value, such as 125kPa, stop charging, close the gas cylinder regulating valve 12 and the ball valve 6, maintain the pressure for 15 days, check the airtightness of the tested composite hood 1 and record the measured pressure value of the pressure gauge 5, open the ball valve 6 and the pressure regulating valve 8, start the vacuum pump 10 until the pressure gauge 5 measures the specified pressure value, such as 30kPa, turn off the vacuum pump 10, the pressure regulating valve 8 and the ball valve 6 in turn, maintain the pressure of 30kPa for 2 days, check the airtightness of the composite hood 1 and record the measured pressure value of the pressure gauge 5.
[0024] In actual application:
[0025] (1) First, according to the above requirements, various components involved in the composite head cover are manufactured;
[0026] (2) A sealing pad 2 is provided under the composite head cover 1 to ensure air tightness;
[0027] (3) The composite head cover 1 and the sealing gasket 2 are fixed to the sealing tool 3 by screws arranged in a circumferential array;
[0028] (4) The pressure-resistant main pipeline 4 is threadedly connected to the upper end of the three-way joint 7, and the pressure regulating valve 8 and the pressure gauge 5 are threadedly connected to the pressure-resistant main pipeline 4. The pressure regulating valve 8 is the control part, and the pressure gauge 5 is the feedback mechanism for closed-loop control;
[0029] (5) The vacuum pump 10 is threadedly connected to the right end of the three-way joint 7, and the left end of the three-way joint 7 is threadedly connected to the nitrogen cylinder 13. When inflating, the nitrogen cylinder 13 serves as the gas source for the airtight test. In the vacuum mode, the vacuum pump 10 serves as the power source;
[0030] (6) The two ends of the pressure regulating valve 8 are threadedly connected to the pressure-resistant branch a9, and the pressure regulating valve 8 and the ball valve 6 cooperate with each other to reach the specified pressure value;
[0031] (7) One end of the gas cylinder regulating valve 12 is threadedly connected to the pressure-resistant branch pipe b11, and the other end is threadedly connected to the nitrogen gas cylinder 13.
[0032] The above description is only an explanation of the preferred embodiments of the present application and the technical principles and other schemes used. At the same time, the scope of the utility model involved in the present application is not limited to the technical scheme formed by a specific combination of the above technical features, but also includes other technical schemes formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical scheme.
Claims
1. A composite hood inflation and vacuum testing device, comprising a sealing test system, a vacuum system and an inflation system, characterized in that: The sealing test system comprises a composite head cover (1), a sealing gasket (2), a closed tool (3), a pressure-resistant main pipeline (4), a pressure gauge (5), a ball valve (6) and a three-way joint (7); the composite head cover (1) is configured as a semicircular sealing cover; a sealing gasket (2) is provided below the composite head cover (1); the composite head cover (1) and the sealing gasket (2) are fixed to the closed tool (3) by screws arranged in a circumferential array; a hollow chamber is reserved between the composite head cover (1) and the closed tool (3); the closed tool (3) is threadedly connected to the pressure-resistant main pipeline (4); a ball valve (6) threadedly connected is provided on the pressure-resistant main pipeline (4); and the pressure-resistant main pipeline (4) is threadedly connected to the upper end of the three-way joint (7); The vacuum pumping system comprises a pressure regulating valve (8), a pressure-resistant branch pipeline a (9) and a vacuum pump (10); the right end of the three-way joint (7) is threadedly connected to one side of the pressure-resistant branch pipeline a (9); the other side of the pressure-resistant branch pipeline a (9) is threadedly connected to the vacuum pump (10); and the pressure-resistant branch pipeline a (9) is provided with a pressure regulating valve (8) with two ends threadedly connected; The inflation system comprises a pressure-resistant branch pipeline b (11), a gas cylinder regulating valve (12) and a nitrogen gas cylinder (13); the left end of the three-way joint (7) is threadedly connected to the pressure-resistant branch pipeline b (11); the pressure-resistant branch pipeline b (11) is threadedly connected to the gas cylinder regulating valve (12); and the gas cylinder regulating valve (12) is threadedly connected to the nitrogen gas cylinder (13).
2. A composite hood inflation and vacuum testing device according to claim 1, characterized in that: A threaded through hole is provided on one side of the closing tool (3) and extends into the hollow chamber of the composite hood (1).
3. A composite hood inflation and vacuum testing device according to claim 1, characterized in that: The pressure gauge (5) is screw-connected to the pressure-resistant main pipeline (4), and the pressure gauge (5) is located between the sealing tool (3) and the ball valve (6).
4. A composite hood inflation and vacuum testing device according to claim 3, characterized in that: The ball valve (6) is provided with a control handle.
5. A composite hood inflation and vacuum testing device according to claim 1, characterized in that: The pressure regulating valve (8) is located between the right end of the three-way connector (7) and the vacuum pump (10).
6. A composite hood inflation and vacuum testing device according to claim 1, characterized in that: The three-way connector (7) is a T-shaped hollow connector placed upside down.