Observation device for penetration of bubbles in fluid through fiber network structure

Abstract

The invention belongs to the technical field of fluid material observation, and particularly relates to an observation device for air bubbles in fluid penetrating through a fiber network structure, a working table is provided with a fluid storage tank, a transparent observation cylinder, a fluid transition cylinder and a negative pressure driving mechanism which are sequentially connected through a pipeline, and a fiber network preform is arranged in the transparent observation cylinder; a vibration mechanism is connected outside the transparent observation cylinder, a bubble generation mechanism is arranged on the pipeline, and bubbles generated by the bubble generation mechanism are the same as or opposite to the flowing direction of fluid in the pipeline, so that the situation that the bubbles in the fluid and the fluid flow in the same direction or opposite directions under the influence of a vibration energy field and penetrate through the fiber network preform can be directly observed; and a basis is provided for research on bubble movement rules of fluids such as resin and the like in a flowing process and influence of a fiber network structure.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid material observation, and in particular relates to an observation device for bubbles in a fluid passing through a fiber network structure. Background Art

[0002] The flow process of fluids of polymer materials such as resins is related to the viscosity and degree of cure of the resin, while the movement of bubbles in the resin is closely related to the viscosity and flow of the resin. During the curing process of resin-based fiber-reinforced composite prepregs, the bubbles in the resin fluid are affected by the fiber network structure of the resin base and cannot be discharged in time. The remaining bubbles will form pores after the resin is cured. Therefore, studying the movement laws of bubbles in the resin as they flow through the fiber network structure is of great significance for exploring methods to accelerate the discharge of bubbles, reduce composite material defects, and improve material performance.

[0003] Currently, there are mainly the following methods for observing the movement of bubbles in fluids: (1) designing a bubble generating device in a static resin pool, and observing the bubble movement by generating the floating process of bubbles, such as the solution disclosed in patent document CN202220108762.3; (2) designing a resin flow device, and then designing a bubble generating device in the resin flow pipeline, and observing the relationship between the resin flow and the bubble movement by moving the bubbles and the resin in the same direction (resin flows upward, bubbles float up) and in the opposite direction (resin flows downward, bubbles float up). At the same time, the observation methods for the flow of resin through the fiber network are mostly based on the liquid molding process, such as the solution disclosed in patent document CN201310114330.9.

[0004] Both existing methods have their own limitations. The static resin pool cannot accurately reflect the resin flow conditions during the composite material molding process, while the dynamic resin flow device cannot well restore the fiber network structure design of the composite material. Moreover, due to the obstruction of the fiber network structure, the bubbles contained in the fluid cannot be directly observed, and the influence of the external vibration energy field is not considered.

[0005] The existing technology cannot realize the direct observation of bubbles in the fluid passing through the fiber network structure under the influence of the external vibration energy field. Therefore, it is necessary to design a new observation device. Summary of the invention

[0006] The present invention provides an observation device for bubbles in a fluid passing through a fiber network structure. The device arranges a fiber network preform in a transparent observation tube and provides a vibration mechanism, thereby directly observing the bubbles in the fluid passing through the fiber network preform under the influence of a vibration energy field, thereby providing a basis for studying the movement law of bubbles in a fluid such as resin during the flow process and the influence of the fiber network structure.

[0007] The device comprises a workbench, on which a fluid storage tank, a transparent observation tube, a fluid transition tube and a negative pressure driving mechanism which are sequentially connected through pipelines are arranged; a fiber network preform is arranged inside the transparent observation tube, a vibration mechanism is connected to the outside of the transparent observation tube, and a bubble generating mechanism is arranged on the pipeline; the fluid storage tank is connected with the bottom of the transparent observation tube through a pipeline, the top of the transparent observation tube is connected with the top of the fluid transition tube through a pipeline, and the bubble generating mechanism is arranged on the pipeline close to the liquid inlet of the transparent observation tube; or the fluid storage tank is connected with the top of the transparent observation tube through a pipeline, the bottom of the transparent observation tube is connected with the top of the fluid transition tube through a pipeline, and the bubble generating mechanism is arranged on the pipeline close to the liquid outlet of the transparent observation tube.

[0008] In a specific embodiment, a heating element is disposed in the fluid storage tank.

[0009] In a specific embodiment, the outer wall of the transparent observation tube is provided with scale marks.

[0010] In a specific embodiment, the transparent observation tube includes an upper cylinder and a lower cylinder, the upper cylinder and the lower cylinder are fixed by a locking piece, and the fiber network preform is pressed between the upper cylinder and the lower cylinder; sealant is provided between the lower end surface of the side wall of the upper cylinder and the upper end surface of the side wall of the lower cylinder, between the contact surface of the upper cylinder and the fiber network preform, and between the contact surface of the lower cylinder and the fiber network preform.

[0011] In a specific embodiment, the locking member is a bolt or a lock, one end of the locking member is connected to the upper cylinder, and the other end of the locking member is connected to the lower cylinder.

[0012] In a specific embodiment, a camera is provided on the workbench, and the camera is aimed at the transparent observation tube.

[0013] In a specific embodiment, the negative pressure driving mechanism is a vacuum pump, and the vacuum pump is connected to the top end of the fluid transition cylinder.

[0014] In a specific embodiment, the bubble generating mechanism includes a needle and an air pump, one end of the needle is connected to the air outlet of the air pump, the other end of the needle is inserted into the pipe, and the air pump is arranged on the workbench.

[0015] In a specific embodiment, the vibration mechanism includes a vibration plate, an exciter and a support column. A pressure plate is also provided on the top of the upper cylinder. The lower cylinder is arranged on the vibration plate. The pressure plate and the vibration plate are connected by bolts. The pressure plate, the vibration plate and the bolts constitute the locking piece. The exciter is connected to the vibration plate, the top end of the support column is connected to the vibration plate, and the bottom end of the support column is connected to the workbench.

[0016] In a specific embodiment, the vibration mechanism includes a vibration plate, an exciter and a support column, the lower cylinder is connected to the vibration plate, the exciter is connected to the vibration plate, the top end of the support column is connected to the vibration plate, and the bottom end of the support column is connected to the workbench.

[0017] The present invention has at least the following beneficial effects: 1. By adopting a negative pressure driving mechanism to drive the fluid to flow in the pipeline without contact and flow through the fiber network preform, it is possible to reduce the introduction of impurities into the system and the influence of bubbles passing through the fiber network preform.

[0018] 2. By setting up a vibration mechanism and placing the fiber network preform in a transparent observation tube, it is possible to directly observe the situation of bubbles in the fluid passing through the fiber network preform under the influence of the vibration energy field, which provides a basis for studying the movement laws of bubbles in the flow process of resin and other fluids and the influence of the fiber network structure.

[0019] 3. By setting a vibration mechanism and a bubble generating mechanism on the pipeline, it is possible to quantitatively introduce bubbles into the transparent observation tube through the pipeline. Moreover, the liquid inlet direction of the transparent observation tube and the position of the bubble generating mechanism can be set according to observation needs, so as to observe the situation of bubbles passing through the fiber network preform when the bubbles and the fluid flow in the same direction under the influence of the vibration energy field, or observe the situation of bubbles passing through the fiber network preform when the bubbles and the fluid flow in the opposite direction. The use of the device is more flexible and the observation results are more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 4 is an overall structural diagram of an embodiment of the present invention.

[0021] Figure numerals: workbench 1, fluid storage tank 2, transparent observation tube 3, upper cylinder 31, lower cylinder 32, fluid transition cylinder 4, negative pressure driving mechanism 5, fiber network preform 6, vibration plate 71, exciter 72, support column 73, pressure plate 8, bolt 81, bubble generating mechanism 9. DETAILED DESCRIPTION

[0022] In order to better implement the technical solution of the present invention, the contents of the solution of the present invention are further explained below in conjunction with the drawings and embodiments.

[0023] Example 1 See also Figure 1 The present invention provides an observation device for bubbles in a fluid passing through a fiber network structure, comprising a workbench 1, on which are provided a fluid storage tank 2, a transparent observation tube 3, a fluid transition tube 4 and a negative pressure drive mechanism 5 which are sequentially connected by pipelines. Resin is stored inside the fluid storage tank 2. Of course, the resin can also be replaced by other fluids, such as natural rubber. A heating element is provided inside the fluid storage tank 2, which is used to heat the resin stored inside the fluid storage tank 2 to a specified temperature as required, so that it has a certain fluidity. The heating element can be a plurality of electric heating rods, which are inserted into the fluid storage tank 2 and evenly distributed, so as to achieve a uniform temperature of the resin stored inside the fluid storage tank 2. The outer wall of the transparent observation tube 3 is provided with scale marks, which is convenient for calculating data such as the size and movement speed of the bubbles, and provides data support for studying the movement law of the bubbles and the influence of the fiber network structure. A fiber network preform 6 is arranged inside the transparent observation tube 3. The transparent observation tube 3 includes an upper cylinder 31 and a lower cylinder 32. The vibration mechanism includes a vibration plate 71, an exciter 72 and a support column 73. A pressing plate 8 is also arranged on the top of the upper cylinder 31. The lower cylinder 32 is arranged on the vibration plate 71. The pressing plate 8 and the vibration plate 71 are connected by bolts 81. The pressing plate 8, the vibration plate 71 and the bolts 81 together constitute a locking member, which fixes the upper cylinder 31 and the lower cylinder 32 between the pressing plate 8 and the vibration plate 71, and presses and fixes the fiber network preform 6 between the upper cylinder 31 and the lower cylinder 32. By setting the transparent observation tube 3 as a split structure, it is convenient to install and fix the fiber network preform 6. The exciter 72 is connected to the vibration plate 71, the top end of the support column 73 is connected to the vibration plate 71, and the bottom end of the support column 73 is connected to the workbench 1. A rubber pad can be arranged between the bottom end of the support column 73 and the workbench 1 to reduce shock.

[0024] Sealant is provided between the lower end surface of the side wall of the upper cylinder 31 and the upper end surface of the side wall of the lower cylinder 32, between the contact surface of the upper cylinder 31 and the fiber network preform 6, and between the contact surface of the lower cylinder 32 and the fiber network preform 6 to prevent vacuum leakage from the tiny gap between the transparent observation tube 3 and the fiber network preform 6. The sealant can be a transparent resin glue.

[0025] The negative pressure driving mechanism 5 is a vacuum pump, which is connected to the top of the fluid transition tube 4. With this arrangement, the vacuum pump can continuously evacuate the fluid transition tube 4. Under the action of negative pressure, the resin in the fluid storage tank 2 flows along the pipeline through the transparent observation tube 3, passes through the fiber network preform 6, and finally flows into the fluid transition tube 4.

[0026] The fluid storage tank 2 is connected to the bottom of the transparent observation tube 3 through a pipeline, and the top of the transparent observation tube 3 is connected to the top of the fluid transition tube 4 through a pipeline. The bubble generating mechanism 9 is arranged on the pipeline near the liquid inlet of the transparent observation tube 3. This arrangement can achieve quantitative introduction of bubbles into the transparent observation tube 3 through the pipeline, and observe the situation of bubbles passing through the fiber network preform 6 when the bubbles and the fluid flow in the same direction under the influence of the vibration energy field.

[0027] The bubble generating mechanism 9 includes a needle and an air pump. One end of the needle is connected to the air outlet of the air pump, and the other end of the needle is inserted into the pipe. The air pump is set on the workbench 1. This bubble generating mechanism 9 has a simple structure and is easy to install and adjust its position as needed.

[0028] During operation, the resin in the fluid storage tank 2 is first heated to a specified temperature by a heating element to form a fluid state, and the vacuum pump and the vibration mechanism are started. Under the action of negative pressure, the resin flows along the pipeline through the transparent observation tube 3, passes through the fiber network preform 6, and finally flows into the fluid transition tube 4. With the assistance of the vibration mechanism, the residual air in the pipeline is discharged. After the resin flow is stable, the needle connected to the air pump is inserted into the pipeline near the liquid inlet of the transparent observation tube 3. According to the bubble volume required for the test, an equal amount of gas is injected through the air pump to form bubbles, so that the bubble movement can be directly observed, and the bubble movement speed and other data can be calculated with the help of the scale marks set on the outer wall of the transparent observation tube 3. During the observation process, the vibration mechanism can also be turned on or off as needed to compare the impact of vibration on the bubble movement.

[0029] Example 2 Different from the embodiment 1, the fluid storage tank 2 is connected to the top of the transparent observation tube 3 through a pipeline, the bottom of the transparent observation tube 3 is connected to the top of the fluid transition tube 4 through a pipeline, and the bubble generating mechanism 9 is arranged on the pipeline near the liquid outlet of the transparent observation tube 3. With this arrangement, it is possible to quantitatively introduce bubbles into the transparent observation tube 3 through the pipeline, and observe the situation of bubbles passing through the fiber network preform 6 when the bubbles and the fluid flow in the opposite direction under the influence of the vibration energy field.

[0030] Example 3 Different from the first embodiment, the locking member is a bolt 81, one end of the bolt 81 is directly connected to the upper cylinder 31, the other end of the bolt 81 is directly connected to the lower cylinder 32, and the lower cylinder 32 is further connected to the vibration plate 71. In this way, the transparent observation tube 3 and the fiber network preform 6 can be preassembled first, and then the transparent observation tube 3 can be assembled on the vibration plate 71 of the vibration mechanism. In addition, there is no need to set up a pressing plate 8, which is convenient for assembly and reduces costs. It can be observed when there is no constraint on the top of the transparent observation tube 3, that is, when the amplitude of the top and bottom of the transparent observation tube 3 are inconsistent, and the influence of vibration on the movement of bubbles.

[0031] Example 4 Different from the third embodiment, the locking member is a bolt 81 connected by a lock buckle. Compared with the bolt 81, the locking force of the lock buckle is not easy to fail in a vibration environment, and the lock buckle can adopt an existing hook-type lock buckle.

[0032] Example 5 Different from the first embodiment, a camera is also provided on the workbench 1, and the camera is aimed at the transparent observation tube 3. During observation, the camera is used to capture the image of the resin containing bubbles in the transparent observation tube 3, and the bubble movement speed and other data can be calculated with the help of the scale marks provided on the outer wall of the transparent observation tube 3. Compared with direct observation by human eyes, this observation method using the camera to capture images is more accurate. Of course, it is also possible to calculate the bubble movement speed and other data without using the scale marks provided on the outer wall of the transparent observation tube 3, but to calculate the bubble movement speed and other data with the measurement software provided by the existing camera.

[0033] The present invention has at least the following beneficial effects: 1. By adopting the negative pressure driving mechanism 5 to drive the fluid to flow in the pipeline in a contactless manner and flow through the fiber network preform 6, it is possible to reduce the introduction of impurities into the system and the influence of bubbles passing through the fiber network preform 6.

[0034] 2. By setting up a vibration mechanism and placing the fiber network preform 6 in the transparent observation tube 3, it is possible to directly observe the situation of bubbles in the fluid passing through the fiber network preform 6 under the influence of the vibration energy field, which provides a basis for studying the movement laws of bubbles in the flow process of resin and other fluids and the influence of the fiber network structure.

[0035] 3. By setting a vibration mechanism and arranging a bubble generating mechanism 9 on the pipeline, it is possible to quantitatively introduce bubbles into the transparent observation tube 3 through the pipeline. Moreover, the liquid inlet direction of the transparent observation tube 3 and the position of the bubble generating mechanism 9 can be set according to observation needs, so as to observe the situation of bubbles passing through the fiber network preform 6 when the bubbles and the fluid flow in the same direction under the influence of the vibration energy field, or observe the situation of bubbles passing through the fiber network preform 6 when the bubbles and the fluid flow in the opposite direction. The use of the device is more flexible and the observation results are more comprehensive.

[0036] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions and substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. An observation device for bubbles in a fluid passing through a fiber network structure, characterized in that: include: A workbench (1), wherein the workbench (1) is provided with a fluid storage tank (2), a transparent observation tube (3), a fluid transition tube (4) and a negative pressure driving mechanism (5) which are connected in sequence via a pipeline; a fiber network preform (6) is provided inside the transparent observation tube (3), a vibration mechanism is connected to the outside of the transparent observation tube (3), and a bubble generating mechanism (9) is provided on the pipeline; the fluid storage tank (2) is connected to the bottom of the transparent observation tube (3) via a pipeline, the top of the transparent observation tube (3) is connected to the top of the fluid transition tube (4) via a pipeline, and the bubble generating mechanism (9) is provided on the pipeline near the liquid inlet of the transparent observation tube (3); or the fluid storage tank (2) is connected to the top of the transparent observation tube (3) via a pipeline, the bottom of the transparent observation tube (3) is connected to the top of the fluid transition tube (4) via a pipeline, and the bubble generating mechanism (9) is provided on the pipeline near the liquid outlet of the transparent observation tube (3).

2. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1, characterized in that: A heating element is provided in the fluid storage tank (2).

3. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1, characterized in that: The outer wall of the transparent observation tube (3) is provided with scale markings.

4. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1, characterized in that: The transparent observation tube (3) comprises an upper tube (31) and a lower tube (32); the upper tube (31) and the lower tube (32) are fixed by a locking member, and the fiber network preform (6) is pressed between the upper tube (31) and the lower tube (32); a sealant is provided between the lower end surface of the side wall of the upper tube (31) and the upper end surface of the side wall of the lower tube (32), between the contact surface of the upper tube (31) and the fiber network preform (6), and between the contact surface of the lower tube (32) and the fiber network preform (6).

5. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 4, characterized in that: One end of the locking member is connected to the upper cylinder (31), and the other end of the locking member is connected to the lower cylinder (32); the locking member is a bolt (81) or a lock buckle.

6. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1 or 3, characterized in that: A camera is provided on the workbench (1), and the camera is aimed at the transparent observation tube (3).

7. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1, characterized in that: The negative pressure driving mechanism (5) is a vacuum pump, and the vacuum pump is connected to the top end of the fluid transition cylinder (4).

8. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 1, characterized in that: The bubble generating mechanism (9) comprises a needle and an air pump, one end of the needle is connected to the air outlet of the air pump, the other end of the needle is inserted into the pipeline, and the air pump is arranged on the workbench (1).

9. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 4, characterized in that: The vibration mechanism comprises a vibration plate (71), an exciter (72) and a support column (73); a pressure plate (8) is further arranged on the top of the upper cylinder (31); the lower cylinder (32) is arranged on the vibration plate (71); the pressure plate (8) and the vibration plate (71) are connected via bolts (81); the pressure plate (8), the vibration plate (71) and the bolts (81) constitute the locking member; the exciter (72) is connected to the vibration plate (71); the top end of the support column (73) is connected to the vibration plate (71); and the bottom end of the support column (73) is connected to the workbench (1).

10. The device for observing bubbles in a fluid passing through a fiber network structure according to claim 5, characterized in that: The vibration mechanism comprises a vibration plate (71), an exciter (72) and a support column (73); the lower cylinder (32) is connected to the vibration plate (71); the exciter (72) is connected to the vibration plate (71); the top end of the support column (73) is connected to the vibration plate (71); and the bottom end of the support column (73) is connected to the workbench (1).

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