CN204188465U - A kind of soft gas-pocket thereof cylinder inner wall being loaded to interior pressure - Google Patents

Abstract

The utility model belongs to the technical field of aerospace environment strength, and in particular relates to a soft airbag which loads internal pressure on the inner wall of a cylinder. The airbag is a round cake-shaped airbag composed of an upper end surface, a lower end surface and a side wall. Cloth strips are evenly bonded between the upper and lower end surfaces inside the airbag, and two nozzles are processed on the upper end surface; Glue several buckles in a circular direction. The airbag is processed by PVC film. When it is necessary to lay cables and hose equipment on the inner wall of the test piece during the test, it is required that the cables and hoses can pass through the airbag. At this time, an axial hole is opened in the center of the airbag, and a hard tube is passed through the hole. When it is necessary to load different internal pressure loads at different heights of the test piece during the test, install multiple airbags in sequence along the axial direction, and each airbag has two hoses leading out, which are used for pressurization and pressure measurement respectively. Pass the two hoses from the upper airbag through the hard tube in the center of the lower airbag. The utility model has the advantages of light weight, extremely low cost and convenient installation.

Description

A soft airbag that applies internal pressure to the inner wall of a cylinder

technical field

The utility model belongs to the technical field of aerospace environment strength, and in particular relates to a soft airbag which loads internal pressure on the inner wall of a cylinder.

Background technique

There are many structural components of the rocket subject to internal pressure loads, such as fairings, instrument cabins, inter-box sections, inter-stage sections, bellows, etc. These components require testing during development, design and production. The internal pressure test is to use gas or liquid as the stamping medium to simulate the design situation when the internal pressure of the rocket structure reaches the maximum in a certain working state. For example, when the rocket flies in the atmosphere, the instrument cabin and the truncated cone shells of the head bear the internal pressure formed by aerodynamic force.

The traditional internal pressure realization method is to process an internal pressure cylinder with steel. The steel cylinder is welded by the upper and lower ring plates and the cylinder shell. For the rubber cylinder, use the upper and lower pressure rings to press the upper and lower flanging of the rubber cylinder on the steel cylinder, and fasten the connection with bolts, so that a closed space is formed between the rubber cylinder and the steel drum. Air pressure is applied to the barrel through the nozzle to realize the internal pressure load on the test piece. It can be seen that the traditional internal pressure realization method is cumbersome and costly, requiring a large amount of steel and natural rubber.

Contents of the invention

The purpose of this utility model is to provide a soft airbag that applies internal pressure to the inner wall of the cylinder, so as to overcome the above-mentioned shortcomings in the prior art.

The technical scheme that the utility model takes is:

A soft airbag that applies internal pressure to the inner wall of a cylinder. The airbag is a round cake-shaped airbag composed of an upper end surface, a lower end surface and a side wall. Two nozzles are processed on the upper end surface; several buckles are pasted circumferentially on the upper end surface.

The airbag is processed by PVC film.

The cloth strips are canvas strips.

When it is necessary to lay cables and hose equipment on the inner wall of the test piece during the test, it is required that the cables and hoses can pass through the airbag. At this time, an axial hole is opened in the center of the airbag, and a hard tube is passed through the hole.

When it is necessary to load different internal pressure loads at different heights of the test piece during the test, install multiple airbags in sequence along the axial direction, and each airbag has two hoses leading out, which are used for pressurization and pressure measurement respectively. Pass the two hoses from the upper airbag through the hard tube in the center of the lower airbag.

The hose is a plastic hose with a diameter of 8 mm; the hard tube is a plastic hard tube or steel pipe with a diameter of 30 mm.

The diameter of the air bag is larger than the inner diameter of the test piece.

The cloth strips are determined according to the loading pressure required for the test. If the pressure is high, choose cloth strips with strong tensile strength and easy bonding, and increase the distribution density of the cloth strips.

During the test, tie a certain length of rope around the end frame of the test piece, and connect the other end of the rope to the buckle on the upper end of the airbag to fix the airbag at a specified height.

The beneficial effects obtained by the utility model are:

The soft airbag for loading the internal pressure on the inner wall of the cylinder in the utility model adopts PVC film without steel material, light in weight, extremely low in cost, and easy to install.

Description of drawings

Fig. 1 is a structural schematic diagram A of a soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 2 is a structural schematic diagram B of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 3 is a structural schematic diagram C of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 4 is a schematic structural diagram D of a soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 5 is a schematic structural diagram E of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 6 is a structural schematic diagram F of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 7 is a schematic structural diagram G of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 8 is a schematic structural diagram H of the soft airbag that applies internal pressure to the inner wall of the cylinder described in the present invention;

Fig. 9 is the structural schematic diagram I of the soft airbag that loads internal pressure on the inner wall of the cylinder according to the utility model;

In the figure: 1. Upper end face; 2. Lower end face; 3. Cloth strip; 4. Nozzle; 5. Buckle; 6. Side wall; 7. Hard pipe.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the soft airbag that loads internal pressure on the inner wall of the cylinder described in the utility model is a round pie-shaped airbag composed of an upper end surface 1, a lower end surface 2 and a side wall 6, as shown in Figure 2, inside the airbag Cloth strips 3 are evenly bonded between the upper and lower end surfaces, and two nozzles 4 are processed on the upper end surface 1, which are respectively used for pressurization and pressure measurement; To limit and fix the airbag during installation.

During the test, tie a certain length of rope around the end frame of the test piece, and connect the other end of the rope to the buckle 5 on the upper end of the airbag to fix the airbag at a specified height, as shown in Figure 3 and Figure 4 . The two nozzles 4 of the airbag are respectively connected to the pressurizing device and the pressure measuring equipment. The air bag is blown and pressurized, and the upper end surface 1 and the lower end surface 2 of the air bag are held by the axial cloth strips 3 to keep the shape unchanged. The side wall 6 of the airbag continuously expands with the increase of the inflation amount until it completely fits with the inner wall of the test piece, thus achieving the purpose of loading a uniformly distributed pressure on the designated part of the inner wall of the test piece.

The cloth strip 3 that is used to pull the upper and lower end faces of the airbag depends on the size of the required loading pressure for the test. If the pressure is high, select the cloth strip 3 with strong tensile strength and convenient bonding, and increase the distribution density of the cloth strip. In order to ensure that the side wall 6 of the airbag fits perfectly with the inside of the test piece, the diameter of the airbag should be slightly larger than the inner diameter of the test piece. Since the airbag is a soft airbag, it does not affect the installation.

When it is necessary to lay cables, hoses and other equipment on the inner wall of the test piece during the test, it is required that the cables and hoses can pass through the airbag. The airbag is modified, and an axial hole is opened in the center of the airbag. In order to ensure that it does not deform during pressurization, a hard tube 7 capable of carrying a certain external pressure is passed through the hole, as shown in Figures 5 and 6. Since the hard tube 7 can bear a certain external pressure, it can ensure that it does not deform during the pressurization process and does not affect the normal loading of the internal pressure load of the test piece.

When it is necessary to load different internal pressure loads at different heights of the test piece during the test, multiple airbags can be installed in sequence along the axial direction, as shown in Figure 6 and Figure 7. Each airbag has two hoses leading out respectively for pressurization and pressure measurement. When installing, it is necessary to pass the two hoses of the upper airbag through the hard tube 7 in the center of the lower airbag and connect them to the corresponding pressurization and pressure measurement. On the pressure measuring equipment, as shown in Figure 8 and Figure 9.

The airbag is processed with a PVC film, which requires high film strength and small deformation; the cloth strip 3 adopts a canvas strip with high tensile strength, which is not easy to deform, and is easy to install; the hose adopts a diameter of 8mm The plastic hose; the hard tube 7 adopts a plastic hard tube or steel pipe with a diameter of 30mm; the rope adopts a braided rope or a rubber rope with certain elasticity.

Claims (9)

1. A kind of soft airbag that loads internal pressure to cylinder inwall, it is characterized in that: this airbag is the circular cake shape airbag that is made of upper end surface (1), lower end surface (2) and side wall (6), inside airbag Cloth strips (3) are evenly bonded between the upper and lower end surfaces, and two nozzles (4) are processed on the upper end surface (1); several buttons (5) are pasted circumferentially on the upper end surface (1). 2. The soft airbag for applying internal pressure to the inner wall of the cylinder according to claim 1, wherein the airbag is processed with PVC film. 3. The soft airbag for applying internal pressure to the inner wall of the cylinder according to claim 1, characterized in that the cloth strips (3) are canvas strips. 4. The soft airbag for loading internal pressure on the inner wall of the cylinder according to claim 1, characterized in that: when it is necessary to lay cables and hose equipment on the inner wall of the test piece in the test, it is required that the cables and flexible pipes can pass through the airbag, Axial hole is opened in air bag center now, and hard pipe (7) is worn in hole. 5. The soft airbag for loading internal pressure on the inner wall of the cylinder according to claim 4, characterized in that: when it is necessary to load different internal pressure loads at different heights of the test piece in the test, a plurality of airbags are sequentially placed along the axial direction For installation, each airbag has two hoses leading out respectively for pressurization and pressure measurement. When installing, pass the two hoses of the upper airbag through the hard tube (7) at the center of the lower airbag. 6. The soft airbag for loading internal pressure on the inner wall of the cylinder according to claim 5, characterized in that: the flexible pipe adopts a plastic flexible pipe with a diameter of 8 mm; the hard pipe (7) adopts a plastic flexible pipe with a diameter of 30 mm. Hard pipe or steel pipe. 7. The soft airbag for applying internal pressure to the inner wall of the cylinder according to claim 1, wherein the diameter of the airbag is larger than the inner diameter of the test piece. 8. The soft airbag for loading internal pressure on the inner wall of the cylinder according to claim 1, characterized in that: the cloth strip (3) is determined according to the size of the loading pressure required for the test. Pull strong and easy-to-bond strips, and increase the distribution density of the strips. 9. The soft airbag for loading internal pressure on the inner wall of the cylinder according to claim 1, characterized in that: during the test, a certain length of rope is tied around the end frame of the test piece, and the other end of the rope is connected to the airbag The buckle (5) to the end face is fixed on the specified height of the air bag.