Permeability testing device for carbon fiber preform

Abstract

The utility model discloses a permeability testing device of a carbon fiber preform, which relates to the technical field of permeability testing of the carbon fiber preform, and comprises a testing main body, a testing platform is arranged at the bottom end of the testing main body, a mold is arranged at the upper end of the testing platform, and the testing main body is provided with a pressure sensor. A mold cavity for placing a sample is formed in the mold, a sealing cover plate is arranged at the upper end of the mold, the mold is connected with the sealing cover plate through a connecting assembly, one side of the mold is connected with the testing main body through an arranged liquid inlet pipe, and the other side of the mold is connected with the testing main body through an arranged liquid outlet pipe; according to the scheme, the problems that when an existing carbon fiber preform is subjected to permeability testing, a test sample is put into a mold, a sealing cover is fixed through a plurality of bolts, time and labor are wasted during mounting and dismounting, and the test sample is inconvenient to replace are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of permeability testing of carbon fiber preforms, in particular to a permeability testing device for carbon fiber preforms. Background Art

[0002] A carbon fiber preform is a preform with an insulating component manufactured by a simple device. It is made up of multiple carbon fiber sheets stacked together. These sheets are bonded to each other by a thermoplastic adhesive resin to form a carbon fiber preform. The permeability of the fiber is one of the important factors affecting the flow state of the resin, so the permeability test of the carbon fiber preform is required.

[0003] For example, the Chinese authorized patent with announcement number CN100554933C (device for testing the in-plane and thickness-direction permeability of a fiber ply and method for testing saturated permeability): comprises laying prepreg or dry fiber fabric in a test mold, fixing the network structure of the fiber ply using upper and lower diverter plates and the four sides of the mold cavity, and then using a solvent to remove the resin in the prepreg, thereby solving the problem that unidirectional prepreg is difficult to prepare samples; applying pressure to the fiber ply through a pressurizing device to change its fiber volume fraction; then installing various accessories on the test mold to form different flow channels, including flow channels in the in-plane direction of the fiber ply and flow channels in the thickness direction; injecting a low-viscosity liquid into the test mold under the action of air pressure to make it flow in the fiber ply, and using a stopwatch and a measuring cylinder to record the flow rate of the liquid under different liquid inlet pressures; calculating the corresponding saturated permeability of the fiber ply in the in-plane and thickness direction based on the measured data and in combination with the specific form of Darcy's law in different flow directions.

[0004] However, when conducting permeability tests on existing carbon fiber preforms, the test sample is placed in a mold and the sealing cover is fixed with multiple bolts. The installation and disassembly are time-consuming and labor-intensive, resulting in inconvenience in replacing the test sample. Therefore, this does not meet existing needs. In this regard, we propose a permeability testing device for carbon fiber preforms. Utility Model Content

[0005] The purpose of the utility model is to provide a permeability testing device for a carbon fiber preform, so as to solve the problem in the above-mentioned background technology that when conducting permeability testing on the existing carbon fiber preform, the test sample is placed in a mold and the sealing cover is fixed by multiple bolts, which is time-consuming and labor-intensive to install and disassemble, resulting in inconvenience in replacing the test sample.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a permeability testing device for a carbon fiber preform, comprising: a test body, a test platform provided at the bottom end of the test body, a mold provided at the upper end of the test platform, a mold cavity provided inside the mold for placing a sample, a sealing cover plate provided at the upper end of the mold, the mold and the sealing cover plate being connected by a connecting assembly, one side of the mold being connected to the test body via a provided liquid inlet pipe, and the other side of the mold being connected to the test body via a provided liquid outlet pipe.

[0007] Preferably, the connecting assembly includes a connecting seat and a fixed knob, and the connecting seat is welded and fixed to the mold. A knob groove is provided inside the connecting seat, and the fixed knob is threadedly connected to the knob groove.

[0008] Preferably, the top end of the fixing knob is threadedly connected to a limiting top cover, one end of the sealing cover plate is provided with a threaded connection groove, and the sealing cover plate is threadedly connected to the fixing knob through the threaded connection groove.

[0009] Preferably, a cover plate handle is welded to the upper surface of the other end of the sealing cover plate, and the top end of the cover plate handle is triangular.

[0010] Preferably, an embedded groove is provided on the upper surface of the mold, and a sealing strip is embedded in the interior of the embedded groove.

[0011] Preferably, mounting grooves are provided at the corners of the lower surface of the test body, and a rubber base is inserted into the interior of the mounting grooves.

[0012] Preferably, a rotation safety groove is provided on the front surface of the test body, a control button is provided above the rotation safety groove, and a control panel is provided on the inclined surface of the test body.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model provides a connecting component on one side of the mold, and the sealing cover is connected to the mold through the connecting component. The sealing cover is threadedly connected to the fixing knob through a threaded connecting groove. The sealing cover is rotated until it can no longer be rotated. At this time, the sealing cover covers the opening on the upper surface of the mold, thereby sealing the mold. When the permeability test of the carbon fiber preform is carried out, the sealing cover is rotated to open. At this time, the sealing cover moves upward due to the threaded connection, and the lower surface is separated from the lower surface of the mold, leaking out the mold cavity, and the carbon fiber preform is placed in the mold cavity. The sealing cover is rotated again, and the sealing cover moves downward while rotating, thereby squeezing and sealing the upper surface of the mold, improving the convenience of opening and closing, saving time and effort, and solving the problem that when the permeability test of the existing carbon fiber preform is carried out, the test sample is placed in the mold, and the sealing cover is fixed by multiple bolts. The installation and disassembly are time-consuming and labor-intensive, resulting in inconvenience in replacing the test sample.

[0015] 2. By setting an embedded groove on the upper surface of the mold and setting a sealing strip inside the embedded groove, when the lower surface of the sealing cover plate contacts the upper surface of the mold, the sealing strip is used to improve the connection sealing performance and avoid air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the utility model when viewed from above;

[0018] Figure 3 This is a schematic diagram of the connection assembly structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the sealing cover structure of the utility model;

[0020] In the figure: 1. Test body; 2. Control panel; 3. Control button; 4. Test platform; 5. Mold; 6. Mold cavity; 7. Embedded groove; 8. Sealing strip; 9. Liquid inlet pipe; 10. Liquid outlet pipe; 11. Sealing cover; 12. Cover handle; 13. Connecting assembly; 14. Rubber base; 15. Rotating safety groove; 16. Mounting groove; 17. Connecting seat; 18. Fixing knob; 19. Knob groove; 20. Limiting top cover; 21. Threaded connection groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] See also Figure 1-4The present invention provides an embodiment of a carbon fiber preform permeability test device, comprising: a test body 1, a rotating safety groove 15 provided on the front surface of the test body 1, a control button 3 provided above the rotating safety groove 15, a control panel 2 provided on the inclined surface of the test body 1, a test platform 4 provided at the bottom end of the test body 1, a mold 5 provided at the upper end of the test platform 4, a mold cavity 6 for placing a sample provided inside the mold 5, a sealing cover plate 11 provided at the upper end of the mold 5, and the mold 5 and the sealing cover plate 11 are connected by a connecting component 13. One side of the mold 5 is connected to the test body 1 through a liquid inlet pipe 9, and the other side of the mold 5 is connected to the test body 1 through a liquid outlet pipe 10. The connecting assembly 13 includes a connecting seat 17 and a fixed knob 18, and the connecting seat 17 is welded and fixed to the mold 5. A knob groove 19 is provided inside the connecting seat 17, and the fixed knob 18 is threadedly connected to the knob groove 19. The top of the fixed knob 18 is threadedly connected to the limiting top cover 20. A threaded connection groove 21 is provided at one end of the sealing cover plate 11, and the sealing cover plate 11 is threadedly connected to the fixed knob 18 through the threaded connection groove 21.

[0023] The top end of the fixing knob 18 is inserted into the threaded connection groove 21 of the sealing cover plate 11, and the sealing cover plate 11 is threadedly connected to the fixing knob 18 through the threaded connection groove 21. The sealing cover plate 11 is rotated until it can no longer be rotated. At this time, the sealing cover plate 11 covers the opening on the upper surface of the mold 5, thereby sealing the mold 5. When conducting the permeability test of the carbon fiber preform, the sealing cover plate 11 is rotated to open. At this time, the sealing cover plate 11 moves upward due to the threaded connection, and the lower surface is separated from the lower surface of the mold 5, leaking the mold cavity 6. The carbon fiber preform is placed into the mold cavity 6, and the sealing cover plate 11 is rotated again. The sealing cover plate 11 moves downward while rotating, thereby squeezing and sealing the upper surface of the mold 5, and improving the connection sealing through the sealing strip 8, improving the convenience of opening and closing, saving time and effort.

[0024] See also Figure 1 A cover handle 12 is welded on the upper surface of the other end of the sealing cover 11, and the top of the cover handle 12 is triangular. The triangular cover handle 12 is convenient for people to grab and push, and is not easy to slip out of the hand, thereby improving the stability of the rotation of the sealing cover 11.

[0025] See also Figure 1 The upper surface of the mold 5 is provided with an embedded groove 7, and a sealing strip 8 is embedded in the embedded groove 7. When the lower surface of the sealing cover plate 11 contacts the upper surface of the mold 5, the sealing strip 8 is used to improve the connection sealing performance.

[0026] See also Figure 2 The corners of the lower surface of the test body 1 are provided with mounting grooves 16 , and the rubber base 14 is inserted into the mounting grooves 16 to support the test body 1 .

[0027] Working principle: When in use, the threaded end of the fixing knob 18 passes through the connecting seat 17 from bottom to top and is threadedly connected to the knob groove 19 until the fixing knob 18 cannot be rotated, and the top end of the fixing knob 18 is inserted into the threaded connection groove 21 of the sealing cover plate 11. The sealing cover plate 11 is threadedly connected to the fixing knob 18 through the threaded connection groove 21. The sealing cover plate 11 is rotated until it cannot be rotated. At this time, the sealing cover plate 11 covers the opening on the upper surface of the mold 5, thereby sealing the mold 5. The limiting top cover 20 is threadedly connected to the fixing knob 18 to limit the top end of the fixing knob 18 to prevent the sealing cover plate 11 from falling. When conducting the permeability test of the carbon fiber preform, the sealing cover plate 11 is rotated to open At this time, the sealing cover plate 11 moves upward due to the threaded connection, and the lower surface is separated from the lower surface of the mold 5, leaking out of the mold cavity 6. The carbon fiber preform is placed in the mold cavity 6, and the sealing cover plate 11 is rotated again. The sealing cover plate 11 moves downward while rotating, thereby squeezing and sealing the upper surface of the mold 5, and improving the connection sealing performance through the sealing strip 8, improving the convenience of opening and closing, saving time and effort, and the test liquid enters the mold cavity 6 from the liquid inlet pipe 9, contacts the carbon fiber preform, and is finally discharged from the liquid outlet pipe 10. The flow sensor (not shown in the figure) set at the inlet and outlet is used to obtain the liquid flow data under different pressure difference conditions. The permeability is calculated by data comparison. The calculation formula is as follows:

[0028] Permeability = (volume of fluid passing through a solid / time) / (area of ​​the solid x pressure difference of the fluid passing through the solid).

[0029] The unit of this formula is cubic meter / second, which represents the volume of fluid passing through a solid per unit area per unit time. The higher the permeability, the stronger the ability of the fluid to pass through the solid.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A permeability test device for a carbon fiber preform, comprising a test body (1), a test platform (4) provided at the bottom end of the test body (1), a mold (5) provided at the upper end of the test platform (4), a mold cavity (6) provided inside the mold (5) for placing a sample, and characterized in that: A sealing cover plate (11) is provided at the upper end of the mold (5), and the mold (5) and the sealing cover plate (11) are connected via a connecting assembly (13). One side of the mold (5) is connected to the test body (1) via a provided liquid inlet pipe (9), and the other side of the mold (5) is connected to the test body (1) via a provided liquid outlet pipe (10).

2. The carbon fiber preform permeability testing device according to claim 1, characterized in that: The connecting assembly (13) comprises a connecting seat (17) and a fixed knob (18), and the connecting seat (17) is fixed to the mold (5) by welding, a knob groove (19) is provided inside the connecting seat (17), and the fixed knob (18) is threadedly connected to the knob groove (19).

3. The carbon fiber preform permeability testing device according to claim 2, characterized in that: The top end of the fixed knob (18) is threadedly connected to a limit top cover (20), one end of the sealing cover plate (11) is provided with a threaded connection groove (21), and the sealing cover plate (11) is threadedly connected to the fixed knob (18) through the threaded connection groove (21).

4. The carbon fiber preform permeability testing device according to claim 1, characterized in that: A cover plate handle (12) is welded to the upper surface of the other end of the sealing cover plate (11), and the top end of the cover plate handle (12) is triangular.

5. The carbon fiber preform permeability testing device according to claim 1, characterized in that: An embedded groove (7) is provided on the upper surface of the mold (5), and a sealing strip (8) is embedded in the interior of the embedded groove (7).

6. The carbon fiber preform permeability testing device according to claim 1, characterized in that: The corners of the lower surface of the test body (1) are each provided with a mounting groove (16), and the interior of the mounting groove (16) is inserted into a rubber base (14).

7. The carbon fiber preform permeability testing device according to claim 1, characterized in that: The front surface of the test body (1) is provided with a rotation safety groove (15), a control button (3) is provided above the rotation safety groove (15), and the inclined surface of the test body (1) is provided with a control panel (2).

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