A constant volume sealing device

Abstract

The application provides a constant-volume sealing device, which comprises a test chamber, a first sealing body, a sealing cover, a constant force module and an assisting module; the first sealing body is arranged between the test chamber and the sealing cover; the constant force module is arranged on the assisting module, and the constant force module is connected with the sealing cover. The constant force module applies a constant force to the sealing cover, so that the sealing degree is the same no matter manual operation or automatic operation, artificial errors are not introduced, and the operation is simple, which provides a basis for full-automatic continuous test of multiple samples.

Description

Technical Field

[0001] This invention relates to the field of analytical instrument technology, and in particular to a constant volume sealing device. Background Technology

[0002] With the deepening of research on various materials, the measurement of true volume has received increasing attention. Measuring true volume is used to calculate important parameters such as true density, porosity, open porosity, and closed porosity. Currently, commonly used methods include the liquid displacement method, density gradient method, and gas diffusion method. The liquid displacement method uses liquids that easily interact with the sample, and liquids cannot enter smaller pores, leading to significant deviations in test results. The density gradient method suffers from the same problem as the liquid displacement method, and it requires mixing liquids of different densities, which often have environmental impacts. In contrast, the gas diffusion method is simple to operate, environmentally friendly, and non-destructive to the sample. It can test not only solids but also liquids and colloids; therefore, the application of the gas diffusion method is becoming increasingly widespread.

[0003] The principle of gas diffusion is based on Boyle's law (sometimes also called Mariotte's law): at a constant temperature, the volume of an ideal gas is inversely proportional to its pressure; that is, when the temperature is constant, the volume of a given molar amount of gas is inversely proportional to its pressure. In other words, at a constant temperature, the product of the volume and pressure of a given molar amount of gas is a constant.

[0004] After pressure P1 is established in the sample chamber (Vs) or reference chamber (Vr) containing the sample (Vsampe), the pressure becomes P2 after the valve is opened and the pressure diffuses into the reference chamber (Vr) or the sample chamber (Vs) containing the sample (Vsampe). According to Boyle's Law:

[0005] (Vs-Vsampl)*P1=Vr*P2 or Vr*P1=(Vs-Vsampl)*P2

[0006] Vs and Vr are known quantities that can be obtained through calibration, thus allowing the calculation of the true volume Vsample of the sample.

[0007] Currently, there are several problems with true volume measurement instruments on the market. First, the sealing of the sample chamber often employs methods such as threaded rotary sealing or rolling bearing rotary sealing. These methods require manual rotation of the sealing cap, but they cannot guarantee that the degree of sealing during Vs calibration and sample measurement is the same, which is the basis for testing and analysis calculations. If the degree of sealing is inconsistent each time, it means that Vs changes with each operation, resulting in unstable or even distorted data. In addition, the manual sealing process is quite complicated, especially the threaded rotation, which often requires a strong wrench, making it time-consuming and labor-intensive.

[0008] To address the aforementioned problems, this invention provides a novel sealing structure that maintains the same level of sealing regardless of whether the operation is manual or automatic, eliminating human error and simplifying operation. This provides a foundation for fully automated continuous testing of multiple samples. Summary of the Invention

[0009] To address the numerous problems existing in current true volume testing instruments, this invention proposes a constant volume sealing device. The technical solution of this invention is implemented as follows:

[0010] A constant-volume sealing device includes a test chamber, a sealing body, a sealing cover, a constant force module, and an assist module; the constant force module is used to provide a constant pressure to the sealing cover, and the assist module is used to provide a fulcrum for the constant force module.

[0011] The sealing body is placed between the test chamber and the sealing cover;

[0012] The constant force module is mounted on the assist module and is connected to the sealing cover.

[0013] Preferably, the sealing body is a sealing ring or a sealing gasket.

[0014] Preferably, the constant force module includes a power source; the power source is selected from one of a cylinder, an electric cylinder, or a motor. The function of the power source is to apply an upward or downward force to the sealing cover, thereby causing the sealing cover to compress the sealing body to achieve a seal or to move the sealing cover away from the sealing body to stop the seal.

[0015] Preferably, the constant force module includes several constant force bodies.

[0016] Preferably, the constant force body is a spring, and the constant force module further includes a movable body, a limiting hole, and a second sealing body; the movable body is slidably installed in the limiting hole, the upper end of the movable body is connected to the constant force body, the lower end of the movable body is connected to the sealing body, the second sealing body is disposed at the connection between the movable body and the limiting hole, and the constant force module has an air hole on its side.

[0017] Preferably, the assist module includes a slide rail device; the constant force module is slidably disposed on the slide rail device.

[0018] Preferably, the slide rail device is provided with a power mechanism, which is selected from one of the following: a cylinder, an electric cylinder, or a motor.

[0019] Preferably, the constant force module further includes a power source, a force transmission rod, a lifting rod, a fixing block, a trapezoidal body, and n support arms;

[0020] The constant force module has a pin on its outer surface.

[0021] The auxiliary module also includes a pin slide rail;

[0022] The constant force body is disposed within the trapezoidal body. The upper ends of the n support arms converge to form a through hole. The force transmission rod passes through the through hole and connects the power source and the trapezoidal body. The lifting rod is rotatably fixed to the fixing block. One end of the lifting rod contacts the outer surface of the trapezoidal body, and the other end abuts against the upper surface of the sealing cover.

[0023] Preferably, it also includes an automatic sample grabbing device.

[0024] Preferably, it also includes a weighing device, such as an electronic balance.

[0025] The beneficial effects of this invention are as follows: This invention provides a brand-new sealing structure that maintains the same sealing degree regardless of whether the operation is manual or automatic, without introducing human error, and is simple to operate, providing a basis for fully automated continuous testing of multiple samples. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0028] Figure 1 A three-dimensional structural schematic diagram of an embodiment of a sealing device with constant volume;

[0029] Figure 2 An embodiment of a constant-volume sealing device omits a three-dimensional structural diagram of the automatic sample gripping device;

[0030] Figure 3 A three-dimensional cross-sectional view of the automatic sample grasping device is omitted in this embodiment of a constant-volume sealing device.

[0031] Figure 4 The cross-sectional view of the automatic sample gripping device is omitted in this embodiment of a constant volume sealing device.

[0032] Figure 5 A three-dimensional cross-sectional view of a constant force module in an embodiment of a constant volume sealing device;

[0033] Figure 6 A three-dimensional structural axis view of a constant force module in an embodiment of a constant volume sealing device (top cover not shown);

[0034] Figure 7 A three-dimensional structural schematic diagram of another embodiment of a sealing device with constant volume;

[0035] Figure 8 A three-dimensional structural cross-sectional view of another embodiment of a sealing device with constant volume;

[0036] Figure 9 A cross-sectional view of the structure of another embodiment of a sealing device with constant volume (test chamber not shown);

[0037] Figure 10 A cross-sectional view (sealed state) of a different embodiment of a sealing device with constant volume;

[0038] In the above figures, the figure numbers indicate the following:

[0039] 1. Test chamber;

[0040] 2. First sealing body;

[0041] 3. Sealing cap;

[0042] 4. Constant force body;

[0043] 5. Moving objects;

[0044] 6. Air intake vent;

[0045] 7. Slide rail device;

[0046] 8. Power mechanism;

[0047] 9. Automatic sample gripping device;

[0048] 10. Power source;

[0049] 11. Pressure lifting rod;

[0050] 12. Fixed block;

[0051] 13. Trapezoid;

[0052] 14. Support arm;

[0053] 15. Force transmission rod;

[0054] 16. Second sealing body;

[0055] 17. Weighing device;

[0056] 18. Bolt;

[0057] 19. Pin slide rail. Detailed Implementation

[0058] The technical solutions of the present invention will now be clearly and completely described with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The basic components of the true volume testing device are mature technologies. The reference chamber, valves, pressure sensors, etc. required during the testing process are not shown.

[0060] Example 1

[0061] In a specific embodiment 1, such as Figures 1-6 As shown, a constant volume sealing device includes a test chamber 1, a first sealing ring 2, a sealing cover 3, a constant force module, an assist module, an automatic sample gripping device 9, and a weighing device 17; the first sealing ring 2 is placed between the test chamber 1 and the sealing cover 3; the constant force module is set on the assist module and is connected to the sealing cover 3.

[0062] The constant force module includes three constant force bodies 4, all of which are springs. The constant force module also includes a movable body 5, a limiting hole, and a second sealing body 16.

[0063] In this embodiment, both the first sealing body 2 and the second sealing body 16 are sealing rings.

[0064] In this embodiment, the movable body 5 is inserted into the limiting hole, and the second sealing body 16 is disposed between the movable body 5 and the limiting hole to seal the movable body 5 and prevent gas from overflowing from the limiting hole. One end of the constant force body 4 is fixed to the lower surface of the constant force module cover, and the other end is fixed to the upper surface of the movable body 5. An air inlet 6 is provided on the side of the constant force module. The air inlet 6 is connected to an external air source. The space in which the constant force body 4 is located is not sealed, so the air pressure in this space is stable at one atmosphere. In the unsealed state, the external air source inputs gas into the space between the movable body 5 and the limiting hole through the air inlet 6. At this time, the gas between the movable body 5 and the limiting hole increases, and the pressure is higher than one atmosphere. The elastic force exerted by the constant force body 4 on the upper surface of the movable body 5 is less than the gas pressure between the movable body 5 and the limiting hole, and the constant force body 4 is in a compressed state.

[0065] When sealing is required, the external gas source stops supplying gas, and gas overflows from the vent. The gas pressure between the moving body 5 and the limiting hole gradually stabilizes at one atmosphere, which is normal pressure. During this process, the elastic force of the constant force body 4 is greater than the gas pressure between the moving body 5 and the limiting hole. Therefore, the constant force body 4 pushes the moving body 5 downward, and the moving body 5 compresses the sealing cover 3. The sealing cover 3 then applies pressure to the first sealing ring 2, thus sealing the test chamber 1.

[0066] In this embodiment, the assist module includes a slide rail device 7; the constant force module is slidably mounted on the slide rail device 7. In this embodiment, a power mechanism 8 is provided on the left and right sides of the constant force module. The power mechanism 8 is a motor, which controls the movement of the constant force module on the slide rail device 7 to open or seal the test chamber 1, thereby completing the filling or removal of the sample.

[0067] In this embodiment, the automatic sample grasping device 9 is a robot.

[0068] In this embodiment, the weighing device 17 is an electronic balance.

[0069] This embodiment achieves automatic measurement, and the process is as follows:

[0070] First, the automatic sample gripping device 9 grips the sample and automatically weighs it using the weighing device 17. After recording the weight before the true density test, the automatic sample gripping device 9 grips the sample into the test chamber 1. The power mechanism 8 controls the constant force module to move on the slide rail device 7. An external air source supplies air to the air inlet 6. The moving body 5 compresses the constant force body 4, causing the sealing cover 3 to rise. After the constant force module moves directly above the test chamber 1, the external air source stops supplying air to the air inlet 6. The constant force body 4 pushes the moving body 5 downward, and the moving body 5 squeezes the sealing cover 3. The sealing cover 3 then applies pressure to the first sealing ring 2, completing the sealing of the test chamber 1.

[0071] Because the diameter of the top of the moving body 5 is larger than the diameter of the limiting hole, the moving body 5 cannot pass through the limiting hole. Each time it is sealed, the constant force body 4 extends until the top of the moving body 5 touches the limiting hole and then stops, thus ensuring that the pressure on the first sealing ring 2 and the sealing cover 3 is constant each time it is sealed.

[0072] After the true volume test is completed, the external air source inputs gas into the air inlet 6 again. The pressure between the moving body 5 and the limiting hole gradually exceeds the elastic force of the constant force body 4. The moving body 5 rises, causing the sealing cover 3 to rise, and the sealing ends. Then, the power mechanism 8 controls the constant force module to move on the slide rail device 7, away from the test chamber 1. The automatic sample grabbing device 9 takes out the sample and places it on the weighing device 17 for secondary weighing.

[0073] This embodiment avoids the various problems that may occur with manual weighing, realizes automatic testing of multiple samples on the production line, and greatly improves testing efficiency.

[0074] Example 2

[0075] In a specific embodiment 2, such as Figures 7-10 As shown, a constant volume sealing device includes a test chamber 1, a first sealing ring 2, a sealing cover 3, a constant force module, and an assist module; the first sealing ring 2 is placed between the test chamber 1 and the sealing cover 3; the constant force module is disposed on the assist module and is connected to the sealing cover 3.

[0076] In this embodiment, the constant force module includes a power source 10, three lifting rods 11, three fixing blocks 12, a trapezoidal body 13, and a constant force body 4; in this embodiment, the constant force body 4 is a spring.

[0077] The constant force body 4 is set inside the trapezoidal body 13. The power source 10 is connected to the trapezoidal body 13. The pressure lifting rod 11 is rotatably fixed on the fixing block 12. One end of the pressure lifting rod 11 contacts the outer surface of the trapezoidal body 13, and the other end abuts against the upper surface of the sealing cover 3.

[0078] In this embodiment, the power source 10 is an electric motor.

[0079] In this embodiment, a pin 18 is provided on the outer surface of the constant force module; the auxiliary module is provided with a pin slide rail 19 corresponding to the pin 18. When performing a true density test, the pin 18 is first inserted into the pin slide rail 19, and then rotated and slid, so that the constant force module and the auxiliary module can complete a sealed connection.

[0080] In this embodiment, the constant force module has three support arms 14, which converge to form a through hole. A positive thread is provided inside the through hole, and a corresponding negative thread is provided on the force transmission rod 15 connecting the power source 10 and the trapezoidal body 13. The rotation of the power source 10 drives the force transmission rod 15 to rotate, thereby achieving the raising or lowering of the force transmission rod 15.

[0081] In the unsealed state, the power source 10 rotates and drives the force transmission rod 15 to compress the trapezoidal body 13 downward. At this time, the trapezoidal body 13 compresses the constant force body 4. At the same time, as the height of the trapezoidal body 13 relative to the fixed block 12 decreases, the pressure lifting rod 11 abuts against one end of the outer surface of the trapezoidal body 13 and descends, while the pressure lifting rod 11 abuts against one end of the sealing cover 3 and rises. The pressure on the sealing cover 3 decreases, and the sealing ends.

[0082] In the sealed state, the power source 10 rotates in the opposite direction, causing the force transmission rod 15 to move upward away from the trapezoidal body 13. At this time, the constant force body 4 needs to return from the compressed state to the normal state, so it pushes the trapezoidal body 13 to move upward. The height of the trapezoidal body 13 relative to the fixed block 12 increases, the pressure lifting rod 11 rises at one end against the outer surface of the trapezoidal body 13, and the pressure lifting rod 11 falls at one end against the sealing cover 3. The pressure on the sealing cover 3 increases, and the sealing cover 3 squeezes the first sealing ring 2. Through the extension of the first sealing ring 2, the test chamber 1 is sealed.

[0083] When the constant force 4 returns to normal, the force received by the trapezoidal body 13 includes its own weight and the reaction force (rebound force) of the constant force body 4 compressed by gravity. Since the weight of the trapezoidal body 13 is constant and the pressure on the constant force body 4 is constant, the reaction force received by the constant force body 4 is also constant. The height of the trapezoidal body 13 relative to the fixed block 12 is fixed. This ensures that the pressure of the lifting rod 11 on the sealing cover 3 is constant in every sealing test, thus guaranteeing a consistent degree of sealing each time. In this embodiment, the power source 10 uses a motor, but in actual operation, the force transmission rod 15 can also be manually turned away from the trapezoidal body 13, achieving the same sealing principle and ensuring the same degree of sealing.

[0084] After the full volume test is completed, the power source 10 reverses its rotation, the force transmission rod 15 descends, and the trapezoidal body 13 is squeezed. The trapezoidal body 13 squeezes the constant force body 4. During the descent of the trapezoidal body 13, the end of the pressure lifting rod 11 that contacts the trapezoidal body 13 descends, and the end of the pressure lifting rod 11 that contacts the sealing cover 3 rises, reducing the pressure on the sealing cover 3, thereby allowing the test chamber 1 to be opened.

[0085] In this embodiment, in order to ensure that the force applied by the lifting rod 11 to the sealing cover 3 is large enough to ensure the sealing effect, the length of the end point of the lifting rod 11 that abuts against the upper end of the sealing cover 3 and the length of the lifting rod 11 that is fixed on the fulcrum of the fixing block 12 should be less than the distance between the end point of the lifting rod 11 that contacts the trapezoidal body 13 and the fulcrum. By utilizing the lever principle, a better sealing effect can be achieved.

[0086] To further ensure the sealing effect, in this embodiment, the angle between the three pressure rods 11 and the three fixing blocks 12 is 120°, which ensures that the sealing ring is compressed to the same degree and the sealing effect is better.

[0087] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device with constant volume, characterized in that, Includes a test chamber, a first sealing body, a sealing cover, a constant force module, and an assist module; The first sealing body is placed between the test chamber and the sealing cover; The constant force module is connected to the assist module and the sealing cover; The constant force module includes several constant force bodies; The constant force body is a spring, and the constant force module also includes a movable body, a limiting hole, and a second sealing body; the movable body is slidably installed in the limiting hole, the upper end of the movable body is connected to the constant force body, the lower end of the movable body is connected to the sealing body, the second sealing body is disposed at the connection between the movable body and the limiting hole, and the constant force module has air holes on its side; The first sealing body and the second sealing body are sealing rings or sealing gaskets; The assist module includes a slide rail device; the constant force module is slidably mounted on the slide rail device.

2. The constant volume sealing device according to claim 1, characterized in that, The constant force module includes a power source; the power source is selected from one of the following: a cylinder, an electric cylinder, or a motor.

3. A constant-volume sealing device according to claim 1, characterized in that, The slide rail device is equipped with a power mechanism, which is selected from one of the following: a cylinder, an electric cylinder, or a motor.

4. A constant volume sealing device according to claim 1, characterized in that, It also includes an automatic sample grabbing device.

5. A constant volume sealing device according to claim 4, characterized in that, It also includes weighing devices.

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