Volume measuring device and method for measuring volume of heat exchanger of dilution refrigerator

Abstract

The application provides a volume measuring device and a volume measuring method of a heat exchanger of a dilution refrigerator, and relates to the technical fields of volume measurement and dilution refrigerator. The volume measuring device comprises a reference container, a pressure regulating assembly, a first valve and a pressure gauge. The reference container is used for connecting a to-be-measured container and has a first cylinder and a second cylinder which are slidably connected with each other, and the second cylinder is suitable for reciprocally sliding relative to the first cylinder in an axial direction to change the volume of the reference container. The pressure gauge is suitable for measuring the internal pressure of the reference container. The first valve is arranged between the reference container and the to-be-measured container. The pressure regulating assembly adjusts the pressure in the reference container and the to-be-measured container to a reference pressure and closes the first valve in response to the first valve being initially opened; then adjusts the pressure of the reference container to a first pressure and opens the first valve again, so that the pressure gauge reading decreases to a second pressure; and then drives the second cylinder to slide towards the first cylinder until the pressure gauge reading returns to the first pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of volume measurement and dilution refrigerator, and more particularly, to a volume measurement device and a volume measurement method of a heat exchanger of a dilution refrigerator. BACKGROUND

[0002] In many fields such as industrial production, chemical analysis, food and beverage, and warehouse logistics, accurate measurement of the volume of a container is a basic and key technical requirement. For containers with regular shapes such as cubes and cylinders, the volume can be easily calculated by measuring the geometric dimensions, which is simple and accurate. However, in practical applications, there are a large number of containers with irregular shapes and complex structures, such as unique design of handicraft packaging, ergonomic bottles and cans, special-shaped industrial storage tanks, and parts with complex cavities inside. The inner cavity profile of these containers cannot be described by a simple geometric model, making it difficult for traditional length measurement-based methods to be applicable or even impossible to implement.

[0003] Currently, for volume measurement of irregularly shaped containers, the following two methods are traditionally used: liquid filling method (or drainage method), which involves injecting a liquid with a known density (usually water) into the container to be measured until the scale is full, then weighing or measuring the volume of the liquid used to obtain the volume of the container. Although the principle of this method is simple, it is not suitable for containers that are easily corroded, easily absorb water, or sensitive to moisture. Liquid surface tension, bubble residue, and reading parallax can introduce significant errors. Moreover, this method is destructive or contact-based measurement and cannot be used for containers in sterile or clean environments. Three-dimensional scanning reconstruction method, which uses a three-dimensional scanning device to obtain point cloud data of the inner and outer surfaces of the container, and then reconstructs a three-dimensional digital model of the container through computer software to calculate its internal volume. This method has high accuracy, but the equipment is expensive and highly specialized, the data processing process is complex and time-consuming, and it has high requirements for the optical properties of the container surface.

[0004] Therefore, either the measurement requirement of rapid, non-destructive, and non-contact cannot be met, or it is difficult to popularize due to cost and operational complexity. In related technologies, there is also a method based on Boyle's law to measure the volume by inflating and changing the air pressure, but its measurement accuracy is not high, and it needs to consider multiple factors and complex calculations to improve accuracy. Therefore, how to provide a volume measurement device that can accurately and quickly measure the volume of irregularly shaped containers has become a technical problem to be solved. SUMMARY

[0005] Therefore, the present application provides a volume measurement device that can conveniently and quickly measure the volume of a container to be measured with high accuracy through the cooperation of a reference container with variable volume and a pressure regulating assembly.

[0006] To achieve the above object, the present application provides a volume measuring device, comprising a reference container, a first cylinder and a second cylinder which are slidably connected to each other, the second cylinder is adapted to reciprocally slide along an axial direction relative to the first cylinder to change the volume of the reference container, a pressure gauge adapted to measure the internal pressure of the reference container, a first valve arranged between the reference container and the container to be measured, a pressure regulating assembly configured to regulate the pressure in the reference container and the container to be measured to a reference pressure and close the first valve in response to the first valve being initially opened, then regulate the pressure in the reference container to a first pressure and open the first valve again so that the pressure gauge reading drops to a second pressure, and then drive the second cylinder to slide towards the first cylinder until the pressure gauge reading returns to the first pressure.

[0007] According to an embodiment of the present application, the pressure regulating assembly is configured to inflate the reference container and the container to be measured until the pressure gauge displays the reference pressure in response to the first valve being opened.

[0008] According to an embodiment of the present application, the pressure regulating assembly is configured to evacuate the reference container and the container to be measured to a vacuum in response to the first valve being opened.

[0009] According to an embodiment of the present application, the pressure regulating assembly comprises an inflation pump adapted to inflate the reference container and / or the container to be measured, and a vacuum pump adapted to evacuate the reference container and / or the container to be measured.

[0010] According to an embodiment of the present application, the volume measuring device further comprises a support base, the first cylinder is mounted on the support base, and a driving mechanism, a first end of the second cylinder is slidably connected to the first cylinder, a second end of the second cylinder is connected to the driving mechanism, and the driving mechanism is adapted to drive the second cylinder to slide along the axial direction to approach or move away from the first cylinder.

[0011] According to an embodiment of the present application, the driving mechanism comprises a support plate arranged perpendicularly to the first cylinder on the support base, a screw rod extending along the axial direction and rotatably connected to the support plate, and an extension plate extending radially from the second end of the second cylinder and rotatably connected to the screw rod, and configured to drive the second cylinder to reciprocally move along the axial direction in response to the rotation of the screw rod.

[0012] According to an embodiment of the present application, the support plate extends towards the extension plate a plurality of guide rods parallel to the screw rod, and the extension plate is slidably connected to the guide rods.

[0013] According to the embodiment of the present application, the volume measuring device further comprises a scale extending in the axial direction, mounted on the support base, and a pointer arranged at the second end of the second cylinder and configured to align with at least one scale line of the scale to show the position of the second cylinder relative to the first cylinder in the axial direction.

[0014] The present application also provides a volume measuring method of a heat exchanger of a dilution refrigerator, based on the volume measuring device of any of the above embodiments, the heat exchanger serving as the container to be measured and comprising a shell and a nano-silver powder sintered body filled in the shell, the volume measuring method comprising: connecting the heat exchanger to a reference container through a first valve and opening the first valve; adjusting the pressure in the reference container and the heat exchanger to a reference pressure, then closing the first valve; inflating the reference container to a first pressure; opening the first valve to stabilize the pressure in the reference container and the heat exchanger to a second pressure; pushing the second cylinder towards the first cylinder until the pressure in the reference container and the heat exchanger returns to the first pressure; measuring the moving distance of the second cylinder, and calculating the volume of the heat exchanger according to the moving distance and the bottom area of the second cylinder.

[0015] According to the embodiment of the present application, the first pressure is repeatedly measured at multiple values, and the multiple volume results are averaged.

[0016] The volume measuring device provided by the present application can obtain the equivalent volume of the container to be measured through the reference container with variable volume, the cooperation between the pressure regulating assembly and the first valve, and the variation process of the reference pressure-first pressure-second pressure-first pressure, and has fewer error factors, high precision, simple and reliable structure, and convenient measurement without complex calculation process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the volume measuring device provided by the embodiment of the present application;

[0018] Figure 2 is a plan view of the volume measuring device provided by the embodiment of the present application, showing the container to be measured;

[0019] Figure 3 is a perspective view of the volume measuring device provided by the embodiment of the present application from another angle;

[0020] Figure 4 is a plan view of the volume measuring device provided by the embodiment of the present application, with the container to be measured removed;

[0021] Figure 5 is a flowchart of the volume measuring method of the heat exchanger provided by the embodiment of the present application.

[0022] In the drawings, the meaning of the reference signs is as follows:

[0023] 1. reference container; 11, first cylinder; 12, second cylinder; 121, pointer; 2, pressure regulating assembly; 21, air pump; 22, vacuum pump; 3, first valve; 4, pressure gauge; 5, driving mechanism; 51, support plate; 52, screw rod; 53, extension plate; 54, guide rod; 6, support base; 7, scale; 8, container to be measured. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It is to be understood, however, that these descriptions are merely exemplary and are intended to limit the scope of the present application. In the following detailed description of the embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and techniques have not been described in detail in order to avoid obscuring aspects of the present application.

[0025] The terms used herein are merely used to describe specific embodiments and are not intended to limit the present application. The terms "include", "comprise" and the like used herein mean that the features, steps, operations and / or components listed are present, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0026] All terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having meanings consistent with the context of the present specification, and should not be interpreted in an idealized or excessively formal manner.

[0027] In the case of using expressions similar to "at least one of A, B, and C, etc.", it should be generally interpreted as including one or more of the same as the meaning generally understood by one of ordinary skill in the art (for example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, a system having B alone, a system having C alone, a system having both A and B, a system having both A and C, a system having both B and C, and / or a system having A, B, and C together, etc.).

[0028] Figure 1 is a perspective view of a volume measuring device provided by an embodiment of the present application, Figure 2 is a plan view of a volume measuring device provided by an embodiment of the present application, showing a container to be measured.

[0029] An embodiment of the present application provides a volume measuring device, such as Figure 1 and Figure 2The device is shown to include a reference container 1, a pressure regulating assembly 2, a first valve 3 and a pressure gauge 4. The reference container 1 is used to connect to a container to be measured 8, and has a first cylinder 11 and a second cylinder 12 which are slidably connected to each other, the second cylinder 12 being adapted to reciprocally slide in an axial direction relative to the first cylinder 11 to change the volume of the reference container 1. The pressure gauge 4 is adapted to measure the internal pressure of the reference container 1. The first valve 3 is arranged between the reference container 1 and the container to be measured 8. The pressure regulating assembly 2 is configured to, in response to the first valve 3 being initially opened, regulate the pressure in the reference container 1 and the container to be measured 8 to a reference pressure, and close the first valve 3; then, regulate the pressure in the reference container 1 to a first pressure and open the first valve 3 again, so that the pressure gauge 4 shows a drop in pressure to a second pressure; and then drive the second cylinder 12 to slide towards the first cylinder 11 until the pressure gauge 4 shows a return to the first pressure.

[0030] In such an embodiment, the volume of the container to be measured 8, which is mainly a container with irregular internal shape or without clear volume marking and thus inconvenient to directly measure, is measured by the cooperation of the reference container 1 and the pressure regulating assembly 2. The reference container 1 is a standard container with known specification parameters, including but not limited to length, base area, maximum volume, etc. Moreover, the volume of the reference container 1 can be actively and continuously changed by the axial sliding of the second cylinder 12.

[0031] Specifically, the reference container 1, the first valve 3 and the container to be measured 8 are connected in sequence, the first valve 3 is initially opened, and the pressure regulating assembly 2 regulates the pressure in the whole connected cavity to a preset reference pressure P0, i.e. the pressure gauge 4 shows P0 at this time. Then the first valve 3 is closed, and the pressure regulating assembly 2 regulates the pressure in the reference container 1 to a first pressure P1, i.e. the pressure gauge 4 shows P1 at this time, and P1>P0. Then the first valve 3 is opened again, the pressure in the reference container 1 drops, and the pressure in the container to be measured 8 rises, until the pressure in the whole connected cavity stabilizes to a second pressure P2, i.e. the pressure gauge 4 shows P2 at this time, and P1>P2. Finally, while the first valve 3 is kept open, the second cylinder 12 is driven to slide towards the first cylinder 11, reducing the volume of the reference container 1, and the pressure in the whole connected cavity rises until it returns to P1, i.e. the pressure gauge 4 shows P1 again. At this time, the volume of the container to be measured 8 can be quickly obtained from the reduced volume of the reference container 1.

[0032] Although the measurement is based on Boyle's law, since the specification parameters of the reference container 1 are known, the reduced volume of the reference container 1 can be accurately and conveniently obtained, avoiding complex calculation process, and the volume of the to-be-measured container 8 can be directly obtained, or the more accurate volume result of the to-be-measured container 8 can be obtained by simple correction and conversion combined with the reference pressure. And it is not sensitive to environmental factors such as temperature change, does not need to be matched with complex instruments, has low cost, and can quickly perform multiple measurements. Moreover, the reference container 1, the first valve 3, the to-be-measured container 8 and the pressure regulating assembly 2 need to be connected by pipes when assembled, and the traditional calculation method cannot ignore the pipe volume, and the pipe volume must be measured in advance or calculated step by step during the measurement. However, the present application only needs to observe that the pressure gauge 4 meets the requirements, and the measurement is realized through the balance and recovery of pressure (P0-P1-P2-P1), for example, after the pressure gauge 4 displays P1, the pipe valve is opened to connect the reference container 1 and the pipe, at this time the pressure gauge 4 displays the transition pressure Px. Then the first valve 3 is opened to connect the reference container 1, the pipe and the to-be-measured container 8, at this time the pressure gauge 4 further decreases to P2, then the second cylinder 12 is pushed to make the pressure gauge 4 recover to the transition pressure Px, and the volume of the to-be-measured container 8 can be obtained. In fact, if the pipe volume is much smaller than the volume of the reference container 1 and the volume of the to-be-measured container 8, it can be ignored during the measurement.

[0033] In some embodiments, the pressure regulating assembly 2 is configured to inflate the reference container 1 and the to-be-measured container 8 until the pressure gauge 4 displays the reference pressure in response to the opening of the first valve 3.

[0034] In such embodiments, after the first valve 3 is initially opened, the pressure regulating assembly 2 starts to inflate the communication cavity formed by the reference container 1 and the to-be-measured container 8, and stops when the pressure gauge 4 displays the reference pressure P0. This process can be manually operated by the staff or realized by electric control. In this way, a known initial pressure environment (i.e. the reference pressure P0) can be established for the reference container 1 and the to-be-measured container 8, and the measurement deviation caused by different initial states can be eliminated.

[0035] In some preferred embodiments, the reference pressure is preferably the atmospheric pressure of the measurement environment, and can be adjusted according to the change of the environment, for example 0.15 MPa ± 0.05 MPa. It should be noted that before selecting the reference pressure, the pressure bearing capacity of the reference container 1 and the to-be-measured container 8 should be considered to avoid danger.

[0036] Further, the measurement result can be corrected and converted combined with the reference pressure P0, and the volume of the to-be-measured container 8 = the reduced volume of the reference container 1 .

[0037] In some embodiments, the pressure regulating assembly 2 is configured to draw the reference container 1 and the measured container 8 to a vacuum in response to the first valve 3 being opened.

[0038] In such embodiments, the pressure regulating assembly 2 starts to draw air from the communication cavity formed by the reference container 1 and the measured container 8 after the first valve 3 is initially opened, and stops when the pressure gauge 4 indicates that the vacuum degree meets the requirement. In this embodiment, the pressure gauge 4 can be a conventional pressure gauge or preferably a vacuum pressure gauge, and the process can be manually operated by a worker or realized in an electrically controlled manner. In this way, a pressure environment close to vacuum (i.e., the reference pressure P0) can be established for the reference container 1 and the measured container 8, further reducing the influence of the original gas in the reference container 1 and the measured container 8 on the measurement results, thereby eliminating the need for correction and conversion processes.

[0039] According to embodiments of the present application, as shown in Figure 1 and Figure 2 the pressure regulating assembly 2 includes a gas filling pump 21 and a vacuum pump 22. The gas filling pump 21 is suitable for filling gas into the reference container 1 and / or the measured container 8. The vacuum pump 22 is suitable for drawing a vacuum in the reference container 1 and / or the measured container 8.

[0040] In such embodiments, the combination of the gas filling pump 21 and the vacuum pump 22 enables the pressure regulating assembly 2 to have a wide range of pressure regulation capabilities from high vacuum to positive pressure. This allows the volume measurement device to flexibly adapt to different measurement requirements and initial conditions, such as starting measurement from an atmospheric environment or starting measurement from a vacuum environment, thereby improving the versatility of the device.

[0041] In some alternative embodiments, a second valve and a third valve are further included. The second valve is arranged between the reference container 1 and the vacuum pump 22. The third valve is arranged between the reference container 1 and the gas filling pump 21.

[0042] In some alternative embodiments, the gas filled by the gas filling pump 21 is nitrogen or helium.

[0043] Figure 3 is a perspective view of the volume measurement device provided by embodiments of the present application from another angle, Figure 4 is a plan view of the volume measurement device provided by embodiments of the present application, with the measured container removed.

[0044] In some embodiments, as shown in Figure 3 and Figure 4 the above-mentioned volume measurement device further includes a support seat 6 and a driving mechanism 5. The first cylinder 11 is mounted on the support seat 6. The first end of the second cylinder 12 is in sliding connection with the first cylinder 11, and the second end of the second cylinder 12 is connected with the driving mechanism 5. The driving mechanism 5 is suitable for driving the second cylinder 12 to slide in the axial direction to approach or move away from the first cylinder 11.

[0045] In the embodiment, the support base 6 provides a mounting base for the whole reference container 1, the first cylinder 11 is mounted on the support base 6, preferably fixedly connected, so that the second cylinder 12 can stably slide.

[0046] More specifically, the first cylinder 11 and the second cylinder 12 are both open-ended cylinders, the diameter of the second cylinder 12 is smaller than that of the first cylinder 11, so that the second cylinder 12 can be inserted into or pushed out of the first cylinder 11. The closed end of the second cylinder 12 is connected with the driving mechanism 5. The bottom area of the second cylinder 12 is known, when measuring, only the distance of the second cylinder 12 moving along the axial direction needs to be measured, and then the volume of the reference container 1 after being reduced can be obtained.

[0047] According to the embodiment of the present application, as shown in Figure 3 and Figure 4 , the driving mechanism 5 comprises a support plate 51, a screw rod 52 and an extension plate 53. The support plate 51 is arranged perpendicularly to the first cylinder 11 on the support base 6. The screw rod 52 extends along the axial direction and is rotationally connected with the support plate 51. The extension plate 53 extends radially from the second end of the second cylinder 12 and is rotationally connected with the screw rod 52, and is configured to drive the second cylinder 12 to reciprocally move along the axial direction in response to the rotation of the screw rod 52.

[0048] In the embodiment, the second cylinder 12 is connected with the extension plate 53, or the extension plate 53 serves as the closed end of the second cylinder 12. The screw rod 52 is mounted on the support plate 51 through a bearing, and the support plate 51 and the support base 6 are preferably fixedly connected to support and position the screw rod 52, so that the screw rod 52 can rotate around its own axis and cannot move along the axial direction. The extension plate 53 is also rotationally connected with the screw rod 52 through threads, and when the screw rod 52 rotates, the extension plate 53 and the second cylinder 12 can convert the rotation into movement along the axial direction under the restriction of the first cylinder 11 and the support base 6, so that the volume of the reference container 1 changes.

[0049] In some optional embodiments, a rotating disc is arranged at the end of the screw rod 52 away from the reference container 1, so as to facilitate the operator to rotate the screw rod 52.

[0050] In some optional embodiments, the screw rod 52 is driven by a motor, and after receiving a start instruction from a controller, the motor drives the screw rod 52 to rotate. The controller collects the reading of the pressure gauge 4 in real time, and when the reading returns to the first pressure P1, the controller sends a stop instruction to the motor.

[0051] Further according to the embodiment of the present application, as shown in Figure 3 and Figure 4 , the support plate 51 extends towards the extension plate 53 and extends a plurality of guide rods 54 parallel to the screw rod 52, and the extension plate 53 is slidingly connected with the guide rods 54.

[0052] In this implementation, since the second cylinder 12 needs to reciprocate along the axial direction and its diameter is smaller than that of the first cylinder 11, the second cylinder 12 is actually suspended above the support base 6. Relying solely on the first cylinder 11 to restrict the second cylinder 12 from rotating with the screw 52 results in poor stability. By setting a guide rod 54 that is slidably connected to the extension plate 53, and cooperating with the first cylinder 11 to restrict the rotation of the second cylinder 12, the screw 52 and the extension plate 53 mainly bear the axial force, effectively reducing the impact of bending stress and extending the service life.

[0053] In some optional embodiments, the support base 6 consists of a base and a fixing plate. The base is placed on the ground or a test bench. The fixing plate, the support plate 51 and the extension plate 53 are parallel to each other and arranged perpendicular to the base. The fixing plate is fixedly connected to the base (preferably welded). The first cylinder 11 is fixedly connected to the fixing plate (preferably bolted). The support plate 51 is fixedly connected to the base (preferably bolted).

[0054] In some implementations, such as Figure 2 and Figure 4 As shown, the volume measuring device also includes a scale 7 extending in the axial direction, mounted on the support base 6, and a pointer 121 is provided at the second end of the second cylinder 12, which is configured to align with at least one scale line of the scale 7 to indicate the position of the second cylinder 12 relative to the first cylinder 11 in the axial direction.

[0055] In this implementation, since the bottom area of ​​the second cylinder 12 is known, the change in volume of the reference container 1 can be directly obtained by multiplying the bottom area of ​​the second cylinder 12 by the moving distance. By setting a scale 7, the moving distance of the second cylinder 12 can be read directly without manual measurement, reducing the impact of errors, and is low in cost and relatively reliable.

[0056] In some preferred embodiments, the scale 7 can also directly mark the volume change. Since the bottom area of ​​the second cylinder 12 is known, the moving distance of the second cylinder 12 corresponds one-to-one with the volume change of the reference container 1. Therefore, directly marking the volume change makes the result more intuitive.

[0057] Further according to an embodiment of the present invention, the volume change marked on the scale 7 can also be measured in advance. Specifically, before assembly, the volume of the reference container 1 and the characteristics of the volume change as the second cylinder 12 moves are measured. The measurement method includes, but is not limited to, the water injection method or the air filling method. This can further reduce the impact of errors. For example, when calculating the bottom area of ​​the second cylinder 12, taking an approximate value of pi may introduce errors.

[0058] In some alternative embodiments, the scale 7 can also be a digital display scale, which can directly display the moving distance of the second cylinder 12, and has higher accuracy.

[0059] Figure 5 is a flow chart of the volume measurement method of the heat exchanger provided by the embodiments of the present application.

[0060] The embodiments of the present application also provide a volume measurement method of a heat exchanger, which is based on the volume measurement device in any of the above embodiments, the heat exchanger is a heat exchange structure in a dilution refrigerator, is used as the to-be-measured container 8 and includes a shell and a nano-silver powder sintered body filled in the shell, as shown in Figure 1 、 Figure 2 and Figure 5 , the volume measurement method includes steps S1-S6.

[0061] Step S1, connect the heat exchanger to the reference container 1 through the first valve 3, and open the first valve 3;

[0062] Step S2, after adjusting the pressure in the reference container 1 and the heat exchanger to the reference pressure, close the first valve 3;

[0063] Step S3, inflate the reference container 1 to the first pressure;

[0064] Step S4, open the first valve 3, and stabilize the pressure in the reference container 1 and the heat exchanger to the second pressure;

[0065] Step S5, push the second cylinder 12 to the first cylinder 11 until the pressure in the reference container 1 and the heat exchanger returns to the first pressure;

[0066] Step S6, measure the moving distance of the second cylinder 12, and calculate the volume of the heat exchanger according to the moving distance and the bottom area of the second cylinder 12.

[0067] In such an embodiment, the nano-silver powder sintered body is a porous structure, and the traditional drainage measurement method has the problem that water is difficult to completely penetrate into all pores, resulting in large error, and water may contaminate the nano-silver powder sintered body, affecting subsequent use. The three-dimensional scanning reconstruction method has high measurement cost and long measurement time, which is not conducive to popularization and use. The volume measurement method provided by the present application obtains the equivalent volume of the heat exchanger through the changes of air pressure and volume, has higher accuracy, and is easier to operate. In addition, since the specific surface area of the nano-silver powder sintered body is large, a certain time is needed to stabilize the temperature and pressure when the nano-silver powder sintered body contacts with the gas to generate heat exchange, and the traditional air pressure method is easy to generate reading error at this time. However, the volume measurement method of the present application, especially when the reference pressure is vacuum pressure, does not need to consider the specific value of the second pressure, and only needs to slowly push the second cylinder 12 to restore the reading to the first pressure.

[0068] According to an embodiment of the present application, the volume measurement method further comprises repeating the measurement at a plurality of first pressures and averaging the plurality of volume results.

[0069] In such an embodiment, by repeating the measurement a plurality of times, the random errors appear with a probability that is comparable in the positive and negative directions, and cancel each other out in the averaging process, thus making the final result closer to the true value. Accordingly, if the results of the plurality of measurements are relatively close, it indicates that the device is airtight and in a stable working state. If the results of the plurality of measurements differ greatly, it indicates that there may be an operation error or that the device is leaking.

[0070] It is understood by those skilled in the art that the features described in the various embodiments of the present application can be combined and / or integrated in various ways, even if such combinations or integrations are not explicitly described in the present application. In particular, the features described in the various embodiments of the present application can be combined and / or integrated in various ways without departing from the spirit and teachings of the present application. All such combinations and / or integrations fall within the scope of the present application.

[0071] The embodiments of the present application have been described above. However, these embodiments are merely for illustrative purposes, and are not intended to limit the scope of the present application. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination. Those skilled in the art can make various substitutions and modifications without departing from the scope of the present application, and all such substitutions and modifications shall fall within the scope of the present application.

Claims

1. A volume measuring device, characterized in that, include: A reference container for connecting to a container under test, and having a first cylinder and a second cylinder slidably connected to each other, the second cylinder being adapted to reciprocate relative to the first cylinder in an axial direction to change the volume of the reference container; A pressure gauge suitable for measuring the internal pressure of the reference container; A first valve is disposed between the reference container and the container to be tested; The pressure regulating component is configured to, in response to the initial opening of the first valve, adjust the pressure in the reference container and the test container to a reference pressure and close the first valve; then, adjust the pressure in the reference container to a first pressure and reopen the first valve, causing the pressure gauge reading to drop to a second pressure; then, drive the second cylinder to slide toward the first cylinder until the pressure gauge reading returns to the first pressure.

2. The volume measuring device according to claim 1, characterized in that, The pressure regulating assembly is configured to pressurize the reference container and the test container in response to the opening of the first valve until the pressure gauge displays a reference pressure.

3. The volume measuring device according to claim 1, characterized in that, The pressure regulating assembly is configured to evacuate the reference container and the test container to a vacuum in response to the opening of the first valve.

4. The volume measuring device according to claim 2 or 3, characterized in that, The voltage regulating component includes: An air pump, suitable for inflating the reference container and / or the container under test; A vacuum pump suitable for evacuating the reference container and / or the container under test.

5. The volume measuring device according to claim 4, characterized in that, The volume measuring device further includes: Support base, the first cylinder is mounted on the support base; The driving mechanism has a first end of the second cylinder slidably connected to the first cylinder, and a second end of the second cylinder connected to the driving mechanism. The driving mechanism is adapted to drive the second cylinder to slide along the axial direction to approach or move away from the first cylinder.

6. The volume measuring device according to claim 5, characterized in that, The drive mechanism includes: A support plate is disposed perpendicularly to the support base of the first cylinder; A screw extends along the axial direction and is rotatably connected to the support plate; An extension plate extends radially from the second end of the second cylinder and is rotatably connected to the screw, and is configured to drive the second cylinder to reciprocate axially in response to the rotation of the screw.

7. The volume measuring device according to claim 6, characterized in that, The support plate extends a plurality of guide rods parallel to the screw toward the extension plate, and the extension plate is slidably connected to the guide rods.

8. The volume measuring device according to claim 5, characterized in that, The volume measuring device further includes a scale extending in the axial direction and mounted on the support base. A pointer is provided at the second end of the second cylinder and is configured to align with at least one scale line of the scale to indicate the position of the second cylinder relative to the first cylinder in the axial direction.

9. A method for measuring the volume of a heat exchanger in a dilution refrigeration machine, characterized in that, Based on any one of claims 1-8, the volume measuring device, wherein the heat exchanger serves as a container to be measured and includes a shell and a sintered body of nano-silver powder filled in the shell, and the volume measuring method includes: Connect the heat exchanger to the reference container via a first valve, and open the first valve; After adjusting the pressure in the reference container and the heat exchanger to the reference pressure, close the first valve; Inflate the reference container to a first pressure; Open the first valve to stabilize the pressure in the reference container and the heat exchanger to the second pressure; The second cylinder is pushed toward the first cylinder until the pressure in the reference container and the heat exchanger returns to the first pressure. The movement distance of the second cylinder is measured, and the volume of the heat exchanger is calculated based on the movement distance and the bottom area of ​​the second cylinder.

10. The volume measurement method according to claim 9, characterized in that, It also includes selecting multiple first pressures for repeated measurements and averaging the measured volume results.

Images