Device for detecting air pressure in flexible container

Abstract

The utility model discloses a device for detecting air pressure in a flexible container, which comprises a three-way joint, the three-way joint is respectively provided with a container end, a test end and an air inlet end, the container end, the test end and the air inlet end are respectively provided with a sealing end cover, the air inlet end is provided with an air inlet valve, and the test end is provided with a detection assembly. The device is wide in applicability, can well simulate a preset working condition as long as reasonable connection is carried out regardless of the size, rigidity and flexibility of the container, can obtain the air pressure in the container under a preset condition through test calculation, can simulate the influence on the pressure intensity when the temperature rises due to the fact that gas is compressed, is simple in connection process, and is convenient to operate. The device can be conveniently installed according to a test object, can be used for testing small-volume containers, and is small in test error.

Description

Technical Field

[0001] The utility model belongs to the technical field of air pressure detection, and particularly relates to an air pressure detection device for a flexible container. Background Technique

[0002] At present, most of the pressure gauges on the market are used to measure the liquid pressure. There are very few tools and methods for measuring the air pressure in a container. For measuring the air pressure in a flexible container under a predetermined state, only the test method can be designed according to the actual object. The common solutions are as follows: 1. Measuring the volume of the container by the drainage method and then calculating the air pressure under the predetermined condition by using Boyle's law P1V1 = P2V2; 2. Directly measuring by using a probe type pressure gauge; 3. Measuring by using a mounted pressure gauge.

[0003] For the first solution, it is generally used for measuring the air pressure in a rigid container or a container with low flexibility. Since the flexible container is easy to deform, the internal volume of the flexible container measured by the drainage method is generally not equal to the volume under the predetermined condition (the deformation caused by the pressure of water on the inner wall is not equal to the deformation caused by the gas pressure under the predetermined condition), and the greater the flexibility of the container and the greater the air pressure, the greater the error calculated by the test. For the second solution, there are very few existing instruments, and there are almost none on the market. The test cost is too high, and it belongs to a precision instrument. In order to reduce the influence of gas flow rate and air leakage on the air pressure, the sealing requirement around the probe inlet is relatively high. For the third solution, the connection process is complicated, it is not convenient to install according to the test object, and it is not feasible or has a large error when testing a small-volume container. Therefore, in view of the above problems, it is of great significance to provide an air pressure detection device for a flexible container according to the utility model. Content of the Utility Model

[0004] The utility model provides an air pressure detection device for a flexible container, which has wide applicability. No matter the size and rigidity / flexibility of the container, as long as the connection is made reasonably, the predetermined working condition can be well simulated; the air pressure inside the container under the predetermined condition can be obtained through test calculation, and the influence of the temperature rise caused by gas compression on the pressure can be simulated; the connection process is simple, and it can be easily installed according to the test object, and small-volume containers can be tested with small test errors. In summary, the problems in the background technique are solved.

[0005] In order to solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model discloses a device for detecting air pressure in a flexible container, comprising a three-way joint, on which a container end, a test end and an air inlet end are respectively provided, a plurality of mounting holes are provided at the edges of the container end, the test end and the air inlet end, and a sealing end cover is provided at the container end, the test end and the air inlet end, a plurality of threaded holes are provided at the edge of the sealing end cover, the threaded holes are the same in number and diameter as the mounting holes, and the center of each threaded hole corresponds to the center of each mounting hole one by one, a bolt matched therewith is threadedly connected in the threaded hole, a nut matched therewith is threadedly connected on the bolt, an air inlet valve is provided on the air inlet end, and a detection component is provided on the test end;

[0007] The detection assembly comprises an injection syringe, one end of which is inserted into the test end of the three-way joint, and a piston is arranged in the inner cavity of the injection syringe, and a thimble dynamometer is arranged on the side of the piston away from the three-way joint.

[0008] Furthermore, the outer diameter of the sealing end cover is equal to the inner diameter of the three-way joint, and a sealing ring is provided on the inner wall surface of the sealing end cover.

[0009] Furthermore, the inner wall of the injection syringe and the side wall surface of the piston are coated with lubricating oil.

[0010] Furthermore, a groove is provided at the center of the surface of the piston away from the three-way joint.

[0011] Furthermore, a limiting ring is provided on the ejector dynamometer, the inner diameter of the limiting ring is equal to the outer diameter of the ejector dynamometer, and the outer walls on both sides of the limiting ring are fixedly connected with connecting blocks, the connecting block is L-shaped, and the other end thereof is fixedly connected to the injection syringe.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] (1) The flexible container internal air pressure detection device of the utility model has wide applicability. Regardless of the size, rigidity or flexibility of the container, as long as the connection is reasonable, it can well simulate the predetermined working conditions;

[0014] (2) A flexible container internal air pressure detection device in the utility model can calculate the air pressure inside the container under predetermined conditions through testing, and can simulate the effect of temperature rise on pressure caused by compression of gas;

[0015] (3) The utility model provides a flexible container internal air pressure detection device with a simple connection process and can be conveniently installed according to the test object. It can test small-volume containers with a small test error.

[0016] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a pneumatic pressure detection device in a flexible container of the present utility model;

[0019] Figure 2 is a schematic structural diagram of a three-way joint in the present utility model;

[0020] Figure 3 is a schematic structural diagram of a sealing end cap in the present utility model;

[0021] Figure 4 is a schematic structural diagram of a piston in the present utility model;

[0022] Figure 5 is a schematic structural diagram of a detection component in the present utility model;

[0023] Figure 6 is a partial cross-sectional view of the detection component in the present utility model.

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] 1. Three-way joint; 2. Container end; 3. Test end; 4. Intake end; 5. Mounting hole; 6. Sealing end cap; 7. Threaded hole; 8. Bolt; 9. Nut; 10. Intake valve; 11. Syringe; 12. Piston; 13. Thimble dynamometer; 14. Sealing ring; 15. Card slot; 16. Limiting ring; 17. Connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0027] In the description of the present utility model, it should be understood that terms such as "relative", "one end", "inside", "lateral", "end", "both ends", "both sides", "front", "one end face", "the other end face", etc. indicating orientation or positional relationship are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0028] Please refer to Figures 1-6 As shown, a device for detecting air pressure inside a flexible container of the present utility model includes a three-way joint 1. A container end 2, a test end 3, and an air inlet end 4 are respectively arranged on the three-way joint 1. The container end 2 is connected to a flexible container (such as a plastic, rubber, or latex container). A plurality of mounting holes 5 are provided at the edges of the container end 2, the test end 3, and the air inlet end 4. And sealing end caps 6 are mounted on the container end 2, the test end 3, and the air inlet end 4. A plurality of threaded holes 7 are provided at the edges of the sealing end caps 6. The number of the threaded holes 7 is the same as that of the mounting holes 5, and the diameters are equal. And the center of each threaded hole 7 corresponds to the center of each mounting hole 5 one by one. A bolt 8 that is threadedly engaged with it is threadedly connected in the threaded hole 7. A nut 9 that is threadedly engaged with it is threadedly connected to the bolt 8. By tightening the bolts 8 in each threaded hole 7, the ends thereof can pass through the corresponding mounting holes 5. At this time, when the nut 9 is threadedly connected to each bolt 8 and tightened, the sealing end cap 6 can be fixedly mounted on the container end 2, the test end 3, and the air inlet end 4 through the mutual cooperation between the bolt 8 and the nut 9. An air inlet valve 10 is mounted on the air inlet end 4. After the air inlet valve 10 is opened, the gas to be detected can be introduced into the three-way joint 1 through the air inlet end 4. A detection assembly is provided on the test end 3;

[0029] The detection assembly includes a syringe 11. One end of the syringe 11 is inserted into the test end 3 of the three-way joint 1. And a piston 12 is arranged in the inner cavity of the syringe 11. A thimble dynamometer 13 is arranged on the side of the piston 12 away from the three-way joint 1.

[0030] Wherein, the outer diameter of the sealing end cap 6 is equal to the inner diameter of the three-way joint 1. And a layer of sealing ring 14 is provided on the inner wall surface of the sealing end cap 6. The sealing ring 14 is made of an elastic material such as rubber and is fixed by means such as glue. When the sealing end cap 6 is fixedly mounted on the container end 2, the test end 3, and the air inlet end 4, it can be attached to the inner wall of the three-way joint 1. When one end of the syringe 11 is inserted into the test end 3 of the three-way joint 1, the sealing ring 14 can effectively fill the gap between the syringe 11 and the test end 3 to ensure good sealing during detection.

[0031] Wherein, the inner wall of the syringe 11 and the side wall surface of the piston 12 are both coated with lubricating oil, which can effectively reduce the friction force.

[0032] Wherein, a clamping groove 15 is formed at the center of the surface of the piston 12 on the side far away from the three-way joint 1. The thimble on the thimble force gauge 13 can be aligned with and inserted into the clamping groove 15, and the clamping groove 15 can play a role in limiting, thus effectively preventing the thimble of the thimble force gauge 13 from detaching from the piston 12, making the thimble force gauge 13 more adaptable to the piston 12.

[0033] Wherein, a limiting ring 16 is sleeved on the thimble force gauge 13. The inner diameter of the limiting ring 16 is equal to the outer diameter of the thimble force gauge 13, and connecting blocks 17 are fixedly connected to the outer walls on both sides of the limiting ring 16. The connecting blocks 17 are L-shaped, and the other ends thereof are fixedly connected to the syringe barrel 11. The limiting ring 16 can limit the thimble force gauge 13 to ensure that the axis of the thimble force gauge 13 can always be perpendicular to the plane of the piston 12 during the detection process.

[0034] The circuits, electronic components and chip modules involved in the present utility model are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present utility model does not involve the improvement of software and methods either.

[0035] The standard parts used in the application documents can all be purchased from the market. All the components in the application documents can be customized according to the records in the specification and drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets and welding which are mature in the prior art. The machines, parts and equipment all adopt conventional models in the prior art. The electrical components in this article are all electrically connected to the external main controller and 220V mains power, and the main controller can be a conventional known device such as an LED lamp body for control.

[0036] The working principle of the present utility model is:

[0037] When the present utility model is in use, first connect the container end 2 of the three-way joint 1 to a flexible container (such as a plastic, rubber or latex container), and insert one end of the syringe barrel 11 in the detection component into the test end 3. Then open the intake valve 10 on the intake end 4, and push the piston 12 as far as possible to the bottom (close to the side of the three-way joint 1) under the initial state, but do not completely stick tightly. The thimble force gauge 13 abuts in the clamping groove 15 on the outer side (far away from the side of the three-way joint 1) of the piston 12, and keep the axis of the thimble force gauge 13 perpendicular to the plane of the piston 12, and record the initial reading F1 (N) of the thimble force gauge 13. The cross-sectional area of the piston 12 (the cross-sectional area of the internal channel of the syringe) is S0 (m 2), then inject a predetermined volume of gas from the intake end 4. After reaching the predetermined state, close the intake valve 10 on the intake end 4. During this process, ensure that the piston 12 at the test end 3 remains in its original position (note not to let the piston 12 exert pressure on the inner wall of one side of the tee joint 1). The axis of the thimble dynamometer 13 is perpendicular to the plane of the piston 12. Record the reading F2 (N) of the thimble dynamometer 13. The air pressure on the left side of the piston 12 is equal to the air pressure inside the container, and the right side of the piston 12 is the atmospheric pressure. Assume that the gas pressure inside the container is P1 and the atmospheric pressure at the test site is P0 (which can be directly queried from the local atmospheric pressure or measured with a barometer) at this time (under the predetermined condition). According to the force balance formula of the piston 12: P1S0 = P0S0 + (F2 - F1), the pressure formula is obtained as: P1 = (P0 + (F2 - F1)) / S0. Thus, the gas pressure inside the container can be calculated through calculation.

[0038] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A flexible container internal air pressure detection device, characterized in that, It includes a tee joint, on which a container end, a test end and an air inlet end are respectively arranged. A plurality of mounting holes are opened at the edges of the container end, the test end and the air inlet end, and sealing end caps are mounted on the container end, the test end and the air inlet end. A plurality of threaded holes are opened at the edges of the sealing end caps. The number of the threaded holes is the same as that of the mounting holes, and the diameters are equal. The center of each threaded hole corresponds to the center of each mounting hole one by one. A bolt that matches with the threaded hole is in threaded connection in the threaded hole, and a nut that matches with the bolt is in threaded connection on the bolt. An air inlet valve is mounted on the air inlet end, and a detection assembly is arranged on the test end; The detection assembly includes a syringe. One end of the syringe is inserted into the test end of the tee joint, and a piston is arranged in the inner cavity of the syringe. A thimble dynamometer is arranged on the side of the piston away from the tee joint.

2. The air pressure detection device in a flexible container according to claim 1, characterized in that, The outer diameter of the sealing end cap is equal to the inner diameter of the tee joint, and a layer of sealing ring is arranged on the inner wall surface of the sealing end cap.

3. The air pressure detection device in a flexible container according to claim 1, characterized in that Lubricating oil is coated on the inner wall of the syringe and the side wall surface of the piston.

4. The air pressure detection device for a flexible container according to claim 1, wherein A clamping groove is opened at the center of the surface of the piston on the side away from the tee joint.

5. The air pressure detection device in a flexible container according to claim 1, characterized in that, A limiting ring is sleeved on the thimble dynamometer. The inner diameter of the limiting ring is equal to the outer diameter of the thimble dynamometer, and connecting blocks are fixedly connected to the outer walls on both sides of the limiting ring. The connecting blocks are L-shaped, and the other ends thereof are fixedly connected to the syringe.

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