Liquid container for micro flow measurement and flow measurement device

Abstract

The utility model discloses a liquid container for micro flow measurement and a flow measurement device, which comprise a liquid collection container, a filler component, a liquid level sensor, a liquid level sensor, a liquid level sensor, a liquid level sensor, a liquid level sensor, a liquid level sensor and a liquid level sensor, and the filler component is arranged in the liquid collection container and made of low-water-absorption materials. An accommodating cavity for accommodating to-be-measured liquid is formed between the lower end of the filler component and the bottom of the liquid collecting container; and a through hole for the capillary receiving tube to pass through is formed in the filler assembly. The containing cavity is in a relatively closed environment, liquid to be measured entering the containing cavity is not prone to being affected by external airflow, the evaporation capacity of the liquid to be measured is reduced, meanwhile, the containing cavity is restrained within a proper range through the filler assembly, and due to the fact that the filler assembly has air permeability, the liquid to be measured is not prone to being affected by external airflow. Therefore, when the to-be-measured liquid flows into the accommodating cavity, the gas in the accommodating cavity can be discharged, so that the to-be-measured liquid can smoothly flow into the accommodating cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of flow measurement, in particular to a liquid container and a flow measurement device for measuring micro-flow. Background Art

[0002] Existing micro-flow measurement technologies basically use the mass method, which injects the liquid to be measured into the container, and then weighs the accumulated flow at regular intervals to obtain the average flow error. When injecting flow into the container, a liquid injection assembly consisting of a needle and a capillary channel is used. The needle is suspended above the capillary channel and injects the liquid to be measured into the capillary channel, and then flows into the collection container through the lower end of the capillary channel. The liquid flow is measured by weighing the collection container.

[0003] Since the liquid to be measured eventually needs to flow into the liquid collection container, the liquid collection container generally used is an open structure, which makes the liquid to be measured in the container easily affected by the airflow and increases the evaporation amount. In addition, the volume of the container is generally much larger than the volume of the liquid to be measured, so the evaporation amount of the liquid is also easily increased during the measurement process. Utility Model Content

[0004] The main purpose of the utility model is to provide a liquid container for measuring micro flow, so as to solve the problem in the related art that the liquid to be measured entering the liquid collection container is easy to evaporate.

[0005] In order to achieve the above object, the utility model provides a liquid container for measuring micro flow, comprising:

[0006] Liquid collection container:

[0007] A packing component is arranged in the liquid collection container, the packing component is made of a material with low water absorption rate and is breathable, and a receiving cavity for receiving the liquid to be measured is provided between the lower end of the packing component and the bottom of the liquid collection container;

[0008] The packing component is provided with a through hole for the capillary receiving tube to pass through.

[0009] Furthermore, the packing assembly includes a sealing packing and an exhaust pipe, the sealing packing is made of a material with low water absorption rate, and the through hole is provided on the sealing packing;

[0010] The exhaust pipe passes through the sealing filler and is in communication with the accommodating cavity, and is used for exhausting the gas in the accommodating cavity.

[0011] Furthermore, the inner diameter of the exhaust pipe is smaller than the inner diameter of the liquid outlet pipe.

[0012] Furthermore, the sealing filler is provided with a plurality of mounting holes which penetrate in the axial direction, at least one of the mounting holes is provided with the exhaust pipe, and the remaining mounting holes are provided with detachable sealing plugs.

[0013] Furthermore, the lower end surface of the sealing plug is flush with the lower end surface of the sealing filler.

[0014] Furthermore, the lower end surface of the exhaust pipe is flush with or lower than the lower end surface of the sealing filler.

[0015] Furthermore, the exhaust pipe is configured to be L-shaped, the vertical section of the exhaust pipe is disposed in the mounting hole, and the horizontal section of the exhaust pipe is located above the sealing filler.

[0016] According to another aspect of the present application, a flow measurement device is provided, comprising the above-mentioned liquid container.

[0017] Furthermore, it also includes:

[0018] a weighing balance, on which the liquid collection container is arranged;

[0019] A capillary receiving tube, the capillary receiving tube is configured to be L-shaped, the upper and lower ends of the capillary receiving tube are respectively provided with a liquid receiving port and a liquid discharge port, the lower end of the capillary receiving tube vertically passes through the through hole and extends into the accommodating cavity, and the upper end is located above the liquid collection container and is horizontal;

[0020] A liquid outlet pipe, the liquid outlet pipe includes a horizontal liquid outlet section, the end of the horizontal liquid outlet section is provided with a liquid outlet, the liquid outlet of the liquid outlet pipe is horizontally aligned with the liquid receiving port and maintains a first spacing, so that the liquid discharged from the liquid outlet is sucked into the liquid receiving port at intervals, and the liquid outlet drips the liquid into the liquid collection container at intervals.

[0021] Furthermore, the capillary receiving tube comprises a first tube section and a second tube section which are interconnected, the inner diameter of the second tube section is larger than the inner diameter of the first tube section, the second tube section vertically passes through the packing layer and extends into the accommodating cavity, and the liquid discharge port is located at the lower end of the second tube section;

[0022] The first pipe section includes a horizontal section, and the liquid receiving port is located at an end of the horizontal section.

[0023] In an embodiment of the utility model, a liquid collecting container is provided: it also includes a packing component, which is provided in the liquid collecting container, the packing component is made of a material with low water absorption rate and is breathable, and a receiving cavity for receiving the liquid to be measured is provided between the lower end of the packing component and the bottom of the liquid collecting container; the packing component is provided with a through hole for the capillary receiving tube to pass through, so that the receiving cavity is placed in a relatively closed environment, and the liquid to be measured entering the receiving cavity is not easily affected by the external airflow, thereby reducing the evaporation of the liquid to be measured, and at the same time, the receiving cavity is constrained within a suitable range by the packing component, and because the packing component is breathable, when the liquid to be measured flows into the receiving cavity, the gas in the receiving cavity can be discharged, so that the liquid to be measured can flow in smoothly, thereby solving the problem of easy evaporation of the liquid to be measured entering the liquid collecting container in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, so that other features, purposes and advantages of the present invention become more obvious. The drawings and descriptions of the schematic embodiments of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 is a schematic cross-sectional view of a micro flow measurement device according to an embodiment of the present invention;

[0026] Figure 2 is a perspective structural schematic diagram of a micro flow measurement device according to an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a liquid outlet tube and a capillary receiving tube according to an embodiment of the present invention;

[0028] Figure 4 is a schematic structural diagram of a capillary receiving tube according to one embodiment of the present invention;

[0029] Figure 5 is a schematic cross-sectional view of a micro flow measurement device according to an embodiment of the present invention;

[0030] Among them, 1 liquid collection container, 101 containing cavity, 2 measured medium, 3 weighing balance, 4 inner anti-evaporation cover, 5 packing assembly, 50 sealing packing, 51 exhaust pipe, 6 outer wind shield, 7 liquid outlet pipe, 70 liquid outlet, 8 capillary receiving tube, 80 first pipe section, 801 corner section, 81 second pipe section, 82 liquid outlet, 83 liquid receiving port, 84 horizontal pipe section, 85 vertical pipe section, 9 first humidity adjustment structure, 10 outer anti-evaporation cover, 11 evaporation well, 13 second humidity adjustment structure, 131 containing tank, 132 evaporable liquid, 14 installation chamber, 15 outer anti-evaporation assembly. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to describe the embodiments of the utility model described here.

[0033] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0034] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0035] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] In addition, the term "plurality" shall mean two or more.

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] To solve relevant technical problems, such as Figure 1 As shown, an embodiment of the utility model provides a liquid container for measuring micro flow, comprising: a liquid collecting container 1: a stuffing assembly 5, which is arranged in the liquid collecting container 1, the stuffing assembly 5 is made of a low water absorption material and is breathable, and a receiving cavity 101 for receiving the liquid to be measured is provided between the lower end of the stuffing assembly 5 and the bottom of the liquid collecting container 1; and a through hole is provided on the stuffing assembly 5 for the capillary receiving tube 8 to pass through.

[0039] In this embodiment, the packing component 5 has different arrangements according to different packing types. When the packing component 5 includes a foaming type of packing, the packing component 5 can be formed in the liquid collection container 1 by foaming. When the packing component 5 is an independent component, the packing component 5 can be installed in the liquid collection container 1 for use. In order to improve the liquid weighing capacity of the liquid collection container 1, the weight of the packing component 5 can be as small as possible, that is, the packing component 5 needs to be made of lightweight materials. In this embodiment, there is a receiving cavity 101 for receiving the liquid to be measured between the lower end of the packing component 5 and the bottom of the liquid collection container 1. The receiving cavity 101 can be used to receive a certain amount of liquid, that is, the measured medium 2. The volume of the receiving cavity 101 should be greater than the liquid volume required to complete the entire measurement process.

[0040] In addition, after the packing assembly 5 is arranged in the liquid collection container 1, the accommodating cavity 101 forms a relatively closed space, thereby reducing the influence of external airflow on the evaporation amount of the liquid in the accommodating cavity 101, and constraining the accommodating cavity 101 within a suitable range, which is conducive to measurement.

[0041] In order to allow the liquid in the liquid receiving tube to be smoothly injected into the accommodating cavity 101 , it is necessary to discharge the air in the accommodating cavity 101 while injecting the liquid into the accommodating cavity 101 , thereby maintaining the internal and external pressure balance and allowing the liquid to flow smoothly.

[0042] The present application arranges the packing component 5 so that the accommodating cavity 101 in the liquid collection container 1 is in a relatively closed environment, and the liquid to be measured entering the accommodating cavity 101 is not easily affected by the external airflow, thereby reducing the evaporation of the liquid to be measured. At the same time, the accommodating cavity 101 is constrained within a suitable range by the packing component 5, and because the packing component 5 is air permeable, when the liquid to be measured flows into the accommodating cavity 101, the gas in the accommodating cavity 101 can be discharged, thereby achieving the purpose of allowing the liquid to be measured to flow in smoothly.

[0043] Since the packing component 5 in the present invention needs to have the functions of low water absorption and air permeability, in one embodiment of the packing component 5, the packing component 5 is made of a porous material with low water absorption, and the tiny pores can be used to discharge the air after the liquid is injected into the receiving cavity 101 to balance the internal and external pressures. For example, a polymer material with micropores such as polyamide, polyethylene, and polypropylene can be used.

[0044] In another embodiment of the packing assembly 5, as Figure 1 and Figure 2 As shown, the packing assembly 5 includes a sealing packing 50 and an exhaust pipe 51. The sealing packing 50 is made of a material with low water absorption rate. The sealing packing 50 does not have air permeability. The air permeability requirement of the packing assembly 5 is achieved through the exhaust pipe 51, so the exhaust pipe 51 runs through the sealing packing 50. After the liquid is injected into the accommodating cavity 101, the air in the accommodating cavity 101 can be discharged through the exhaust pipe 51, thereby maintaining the internal and external pressure balance.

[0045] In this embodiment, the sealing filler 50 is made of a foamed lightweight material with low water absorption and good elasticity, and the inner diameter of the exhaust pipe 51 is the same as the inner diameter of the liquid outlet pipe 7. The weight of the sealing filler 50 and the exhaust pipe 51 should be as small as possible to improve the liquid weighing capacity of the liquid collection container 1. After the sealing filler 50 is formed between the capillary receiving tube 8 and the inner wall of the liquid collection container 1 by foaming, the inner diameter value of the liquid pipe 7 is obtained according to the minimum flow rate to be measured, and the same exhaust pipe 51 is selected as the standard exhaust pipe 51, and the exhaust pipe 51 is penetrated through the seal to achieve equal speed "liquid in and air out". Finally, for other measured flow rates, an integer multiple of standard exhaust pipes 51 can be penetrated in the sealing filler 50 to achieve pressure balance under different flow rates.

[0046] In another embodiment, the sealing filler 50 may be a prefabricated component, and at least two through holes extending axially therethrough may be formed on the sealing filler 50 during prefabrication, wherein one through hole is used as a through hole for the second tube section 81 of the capillary receiving tube 8 to pass through and fit tightly, and the other through hole is used as a mounting hole for the exhaust pipe 51 to pass through and fit tightly. The outer diameter of the sealing filler 50 matches the inner diameter of the liquid collection container 1, and the sealing filler 50 can be inserted into the liquid collection container 1 and fixed under the elastic action of the sealing filler 50.

[0047] In a preferred embodiment of the exhaust pipe 51, since the exhaust pipe 51 is used to discharge the gas in the liquid collection container 1 after the liquid enters the liquid collection container 1, when the inner diameter of the exhaust pipe 51 is the same as the inner diameter of the liquid outlet pipe 7, the internal and external pressure balance of the liquid collection container 1 can be achieved. However, considering that the viscosity of the gas is less than the viscosity of the liquid, the gas discharge rate will be greater than the liquid discharge rate, and the inner diameter of the exhaust pipe 51 will also affect the evaporation of the liquid in the liquid collection container 1, the inner diameter of the exhaust pipe 51 is set to be smaller than the inner diameter of the liquid outlet pipe 7 in this embodiment, so that when the equal speed of "liquid in and gas out" can be achieved, the liquid evaporation can be further reduced, thereby improving the measurement accuracy.

[0048] In some environments, multiple exhaust pipes 51 need to be arranged, so multiple axially penetrating mounting holes can be preformed on the sealing filler 50. When only one exhaust pipe 51 is needed, the exhaust pipe 51 can be inserted into only one mounting hole, and the remaining mounting holes are blocked by sealing plugs to prevent liquid from evaporating through the mounting holes. When multiple exhaust pipes 51 are needed, the corresponding sealing plugs can be removed according to the number of exhaust pipes 51, so as to open the corresponding mounting holes, and multiple exhaust pipes 51 can be inserted into each mounting hole one by one.

[0049] To facilitate determination of the spatial size of the accommodating cavity 101, the lower end surface of the sealing plug is preferably flush with the lower end surface of the sealing filler 50, so that the size of the space in the mounting hole where the exhaust pipe 51 is not installed does not need to be considered when determining the spatial size.

[0050] In order to facilitate the discharge of gas in the cavity 101 , the lower end surface of the exhaust pipe 51 in this embodiment is flush with the lower end surface of the sealing filler 50 or lower than the lower end surface of the sealing filler 50 .

[0051] In one embodiment of the exhaust pipe 51 , the exhaust pipe 51 is configured to be L-shaped, the vertical section of the exhaust pipe 51 is disposed in the mounting hole, and the horizontal section of the exhaust pipe 51 is located above the sealing filler 50 .

[0052] like Figures 1 to 3 As shown, an embodiment of the present invention provides a micro flow measurement device based on a mass method, and the measurement device includes:

[0053] Internal anti-evaporation cover 4;

[0054] An outer anti-evaporation component 15, the outer anti-evaporation component 15 is covered on the inner anti-evaporation cover 4;

[0055] A weighing balance 3 is arranged in the inner anti-evaporation cover 4;

[0056] A liquid collection container 1 is arranged in an inner evaporation-proof cover 4 and placed on a weighing balance 3;

[0057] A packing component 5 is disposed in the liquid collection container 1. The packing component 5 is made of a material with low water absorption and is breathable. A receiving cavity 101 for receiving the liquid to be measured is provided between the lower end of the packing component 5 and the bottom of the liquid collection container 1.

[0058] The capillary receiving tube 8 is configured to be L-shaped, and the upper and lower ends of the capillary receiving tube 8 are respectively provided with a liquid receiving port 83 and a liquid discharge port 82, the lower end of the capillary receiving tube 8 vertically passes through the packing assembly and extends into the accommodating cavity 101, and the upper end of the capillary receiving tube 8 passes through the inner anti-evaporation cover 4 and is bent horizontally;

[0059] The liquid outlet pipe 7 includes a horizontal liquid outlet section, and a liquid outlet port 70 is provided at the end of the horizontal liquid outlet section. The liquid outlet port 70 of the liquid outlet pipe 7 passes through the outer anti-evaporation component 15 and is horizontally aligned with the liquid receiving port 83 and maintains a first spacing, so that the liquid discharged from the liquid outlet port 70 is sucked into the liquid receiving port 83 at intervals, and the liquid discharge port 82 drips the liquid into the liquid collection container 1 at intervals.

[0060] In this embodiment, the installation process of the micro flow measurement device can be as follows: the liquid collection container 1 is placed on the weighing scale 3, and the stuffing assembly 5 is arranged in the liquid collection container 1. Of course, the stuffing assembly 5 can also be arranged in the liquid collection container 1 first, and then the liquid collection container 1 with the stuffing assembly 5 is placed on the weighing scale 3.

[0061] In this embodiment, since an inner anti-evaporation cover 4 and an outer anti-evaporation component 15 are provided, exhaust holes may be provided on the inner anti-evaporation cover 4 and the outer anti-evaporation component 15 to allow air in the internal space to flow, or the lower ends of the inner anti-evaporation cover 4 and the outer anti-evaporation component 15 may be in non-sealed contact with a bearing surface (e.g., a desktop).

[0062] After placing the liquid collection container 1, the inner evaporation-proof cover 4 can be placed on the weighing scale 3 and the liquid collection container 1. The arrangement of the inner evaporation-proof cover 4 makes the liquid in the liquid collection container 1 less susceptible to changes in the external airflow, thereby reducing the evaporation of the liquid in the liquid collection container 1, and further reducing the measurement error. The overall size of the inner evaporation-proof cover 4 can be designed according to the size of the weighing scale 3 and the liquid collection container 1, and is not limited in this embodiment. A first mounting hole can be opened at the upper end of the inner evaporation-proof cover 4, and the first mounting hole corresponds to the middle of the liquid collection container 1 from top to bottom, for the capillary receiving tube 8 to pass through.

[0063] In addition, it should be noted that when the filler component 5 is formed in the liquid collection container 1 by foaming, the capillary receiving tube 8 can be first positioned in the middle of the liquid collection container 1 through specific tooling, and then the filler component 5 can be formed between the capillary receiving tube 8 and the side wall of the liquid collection container 1.

[0064] In this embodiment, the capillary receiving tube 8 is configured to be L-shaped, that is, the capillary receiving tube 8 includes a horizontal tube section 84 and a vertical tube section 85, and the liquid receiving port 83 and the liquid discharge port 82 on the capillary receiving tube 8 are respectively located at the ends of the horizontal tube section 84 and the vertical tube section 85. The vertical tube section 85 can extend into the packing assembly 5 after passing through the first mounting hole on the inner anti-evaporation cover 4, and then penetrate the packing assembly 5, so that the liquid in the capillary receiving tube 8 can be injected into the receiving cavity 101 of the liquid collection container 1. The horizontal tube section 84 of the capillary receiving tube 8 is located above the inner anti-evaporation cover 4, and is used to cooperate with the liquid outlet pipe 7 to absorb the liquid squeezed out of the liquid outlet pipe 7 into the capillary receiving tube 8.

[0065] After the capillary receiving tube 8 is arranged, the outer anti-evaporation component 15 can be covered on the outer side of the inner anti-evaporation cover 4 and on the capillary receiving tube 8. A second mounting hole can be opened on the side of the outer anti-evaporation component 15, and at least a portion of the liquid outlet pipe 7 can pass through the second mounting hole in the horizontal direction and correspond to the liquid receiving port 83 of the capillary receiving tube 8. Since during the liquid injection process, the liquid flows out through the liquid outlet 70 of the liquid outlet pipe 7 and is sucked into the capillary receiving tube 8 through the liquid receiving port 83, the outer anti-evaporation component 15 can reduce the influence of the external air flow change on the liquid between the liquid outlet 70 and the liquid receiving port 83, reduce the evaporation amount of this part of the liquid, and thus reduce the measurement error.

[0066] As for the liquid outlet tube 7, it also has a section horizontally aligned with the horizontal section of the capillary receiving tube 8, and the liquid outlet 70 of the liquid outlet tube 7 is located at the end of the section of the liquid outlet tube 7. In this embodiment, the liquid outlet 70 of the liquid outlet tube 7 is not in direct contact with the liquid receiving port 83 of the capillary receiving tube 8, and a certain distance, i.e., the first distance, is maintained between the two. The specific value of the first distance should satisfy: the liquid squeezed out through the liquid outlet 70 can contact with the liquid receiving port 83 after forming a micro-convex liquid surface of a certain size, and be sucked into the capillary receiving tube 8 through the liquid receiving port 83, and no continuous liquid column will be formed between the liquid outlet 70 and the liquid receiving port 83 after suction. In other words, the capillary receiving tube 8 can suck the liquid squeezed out of the liquid outlet 70 at intervals, and drip the liquid into the liquid collection container 1 at intervals through the liquid discharge port 82.

[0067] In this embodiment, the flow measurement method using the micro-flow measurement device is as follows: the liquid of the measured flow rate is squeezed out from the liquid outlet 70 of the liquid outlet tube 7 as the measured medium 2 to form a slightly convex liquid surface. After the liquid surface contacts the liquid receiving port 83 of the capillary receiving tube 8, it is quickly sucked in and cut off due to capillary action and gradually accumulated in the vertical part of the capillary receiving tube 8. After a certain mass of liquid is accumulated in the vertical part, the liquid drips from the liquid discharge port 82 at the lower end of the vertical part into the liquid collecting container 1. Then, the mass of the current liquid collecting container 1 can be obtained by the weighing balance 3, and then the mass of the dripping liquid can be obtained, so that the liquid flow rate can be obtained by the mass method.

[0068] In this embodiment, firstly, the liquid outlet tube 7 and the capillary receiving tube 8 are arranged horizontally and aligned, so that the continuous liquid flow is converted into equal time interval suction, thereby providing a stable reading time for the weighing balance 3, and improving the repeatability and accuracy of the flow measurement;

[0069] Then, the arrangement of the inner anti-evaporation cover 4 and the outer anti-evaporation assembly 15 makes it difficult for the liquid between the liquid outlet pipe 7 and the capillary receiving tube 8 and the liquid flowing into the liquid collection container 1 through the capillary receiving tube 8 to evaporate due to the influence of the external airflow;

[0070] Furthermore, the liquid sucked by the capillary receiving tube 8 is stored in the capillary receiving tube 8. Since the inner diameter of the capillary receiving tube 8 is extremely small, the contact area between its port and the external air is also extremely small, thereby significantly reducing the evaporation amount of the liquid.

[0071] In addition, since the liquid receiving port 83 of the capillary receiving tube 8 is horizontally aligned with the liquid outlet 70 of the liquid outlet tube 7, the moving direction of the squeezed liquid is perpendicular to the direction of gravity, which can reduce the protruding height of the micro-convex liquid surface, so that the capillary receiving tube 8 can be as close to the liquid outlet 70 as possible, reduce the volume and mass of the micro-convex liquid surface, and reduce the evaporation amount of the micro-convex liquid surface and the influence of residual droplets on the measurement result; at the same time, if an instantaneous micro-liquid column is generated between the liquid outlet 70 and the liquid receiving port 83, the capillary force between the liquid receiving end of the capillary receiving tube 8, the micro-liquid column, and the liquid outlet 70 is horizontal, which is orthogonal to the measuring direction of the weighing balance 3, thereby reducing the influence on the reading of the weighing balance 3;

[0072] At the same time, since the liquid discharge port 82 of the capillary receiving tube 8 drips liquid into the liquid collecting container 1 at intervals, a continuous liquid column will not be formed between the liquid discharge port 82 and the liquid collecting container 1, so that there is no additional force between the capillary receiving tube 8 and the liquid collecting container 1, and no measurement error will be caused when the flow rate changes.

[0073] Finally, since a packing assembly 5 is arranged in the liquid collection container 1, and the packing assembly 5 has the characteristics of low water absorption and breathability, after the liquid is injected into the containing chamber in the liquid collection container 1, the air in the containing chamber can be discharged through the packing assembly 5, so that the pressure in the containing chamber is consistent with the ambient pressure, ensuring that the speed at which the liquid is sucked in is constant and is not affected by the amount of liquid injected.

[0074] In summary, the present invention achieves the technical effect of reducing the measurement error of small flow rates and improving the measurement accuracy of small flow rates by improving the measurement device in multiple directions, thereby solving the problem that large measurement errors still exist in small flow rate measurements in related technologies.

[0075] In addition, it should be noted that, in order to facilitate the formation of a certain micro-convex liquid at the end of the liquid outlet pipe 7, the end of the horizontal liquid outlet section of the liquid outlet pipe 7 in this embodiment is set to a conical structure, and the diameter of the end of the conical structure close to the capillary receiving tube 8 is equal to the diameter of the liquid receiving port 83; the first spacing is the spacing between the end of the conical structure close to the capillary receiving tube 8 and the end of the liquid receiving port 83.

[0076] In order to allow the capillary receiving tube 8 to absorb the liquid to be measured at intervals, the first spacing should meet certain conditions. When the first spacing is too small, a continuous liquid column will be formed between the liquid outlet 70 of the liquid outlet tube 7 and the liquid receiving port 83 of the capillary receiving tube 8. At this time, the capillary receiving tube 8 is in a continuous liquid inflow process, resulting in the liquid discharge port 82 of the capillary receiving tube 8 being in a continuous dripping state, and the weighing balance 3 lacks a suitable reading time. When the first spacing is too large, the micro-convex liquid surface squeezed out through the liquid outlet 70 may not be able to contact the liquid receiving port 83 of the capillary receiving tube 8, resulting in the inability to be normally absorbed into the capillary receiving tube 8.

[0077] To this end, in this embodiment, Figure 3 As shown, the first spacing is smaller than the outer diameter of the liquid outlet 70 and larger than the minimum distance required to form a continuous liquid column between the liquid outlet 70 and the liquid receiving port 83. Further, in a preferred embodiment, the first spacing is smaller than 1 / 2 of the outer diameter of the liquid outlet 70. In one embodiment, the minimum micro-convex droplet squeezed through the liquid outlet 70 has a mass of 0.03 mg, and the protrusion degree of the droplet can be determined according to the liquid tension.

[0078] On the basis that the capillary receiving tube 8 is set to be L-shaped, this embodiment further improves it. Specifically, since the inner diameter of the capillary receiving tube 8 is very small, the liquid capacity that can be stored is extremely limited. If the cumulative volume of the sucked liquid is greater than the volume of the capillary tube, it will drip into the collection container. Once dripping, the liquid will expand into a flat thin layer, the surface area will increase significantly, and the evaporation amount will also increase sharply. Therefore, in order to increase the liquid holding capacity of the capillary receiving tube 8 and reduce the evaporation amount of the liquid without affecting the capillary action of the capillary receiving tube 8, the capillary receiving tube 8 in this embodiment has a variable diameter structure.

[0079] Specifically, Figure 1 and Figure 2 As shown, in this embodiment, the capillary receiving tube 8 includes a first tube segment 80 and a second tube segment 81 which are interconnected, the first tube segment 80 includes a horizontal tube segment 84, the vertical tube segment 85 includes a second tube segment 81, the inner diameter of the second tube segment 81 is larger than the inner diameter of the first tube segment 80, the second tube segment 81 vertically passes through the packing assembly and extends into the accommodating cavity 101, and the liquid discharge port 82 is located at the lower end of the second tube segment 81; the first tube segment 80 includes a horizontal segment, and the liquid receiving port 83 is located at the end of the horizontal segment.

[0080] In this embodiment, the first tube segment 80 has a relatively small inner diameter, and can absorb liquid and hold a certain mass of liquid under capillary action. The second tube segment 81 has a relatively large inner diameter, and can significantly increase the liquid holding capacity, reduce the dripping frequency of the liquid, and reduce the evaporation of the liquid. Under the mutual cooperation of the first tube segment 80 and the second tube segment 81, the capillary receiving tube 8 can smoothly absorb liquid, increase the liquid holding capacity of the capillary receiving tube 8, and reduce the evaporation of the liquid with a smaller cross-sectional area.

[0081] Furthermore, since the capillary receiving tube 8 in the present invention is L-shaped, it has two structural forms after being divided into the first pipe section 80 and the second pipe section 81. One of them is that the first pipe section 80 includes a part of the horizontal pipe section 84, and the second pipe section 81 includes a part of the horizontal pipe section 84 and all the vertical pipe sections 85. The other is that the first pipe section 80 includes all the horizontal pipe sections 84 and a part of the vertical sections, and the second pipe section 81 includes the remaining vertical pipe sections 85. Since the liquid needs to flow horizontally first and then vertically in the capillary receiving tube 8, in order to make the flow process of the liquid smoother, the capillary receiving tube 8 in this embodiment is preferably a structural form in which the first pipe section 80 includes all the horizontal pipe sections 84 and a part of the vertical pipe sections 85, and the second pipe section 81 only includes the remaining vertical pipe sections 85.

[0082] Since the liquid changes from horizontal flow to vertical flow in the capillary receiving tube 8 after being sucked, the liquid in the vertical direction in the tube moves downward due to the weight, but the liquid movement direction in the horizontal direction is perpendicular to the gravity direction. Therefore, the liquid in the horizontal direction in the tube must be continuous with the liquid in the vertical direction at the corner of the capillary receiving tube 8 to achieve continuous liquid suction. To this end, it is necessary to ensure that the corner of the capillary receiving tube 8 is as smooth as possible, without generating local resistance to cause liquid continuity interruption or gas accumulation. If the radius of the corner is too large, it may cause the capillary receiving tube 8 to extend too long outside the liquid collection container 1, causing the problem of overload of the balance, so the corner is further improved in this embodiment.

[0083] Specifically, in the present embodiment, the first pipe section 80 further includes a corner section 801, which is used to connect the horizontal pipe section 84 and the vertical pipe section 85. The inner surface of the corner section 801 is set as an arc surface, and the corner radius of the corner section 801 is 1D-2D, where D is the outer diameter of the first pipe section 80. In addition, in order to ensure smooth liquid suction, the liquid receiving port 83 opposite to the liquid outlet pipe 7 should be cylindrical so that the capillary force does not change due to the change in pipe diameter. Further, the first pipe section 80 and the second pipe section 81 are both cylindrical.

[0084] Since the inner diameter of the second pipe section 81 is larger than the inner diameter of the first pipe section 80, in order to reduce the impact of the change in the inner diameter of the pipe section on the liquid in the first pipe section 80 after entering the second pipe section 81, Figure 4 As shown, in this embodiment, the first pipe section 80 and the second pipe section 81 are connected by a transition section 84, and the transition section 84 is set to be conical. The small diameter end of the transition section 84 is connected to the first pipe section 80 and smoothly transitions, and the large diameter end of the transition section 84 is connected to the second pipe section 81 and smoothly transitions, so that the liquid can fully infiltrate the inner wall of the tube after entering the transition section 84 and gradually exhaust the air, so that the liquid can flow smoothly in the transition section 84 and the second pipe section 81. In one embodiment of the transition section 84, the angle between the generatrix of the transition section 84 and the axis of the transition section 84 is 10°-15°. The ratio of the inner diameter of the second pipe section 81 to the inner diameter of the first pipe section 80 is (1.5-3):1.

[0085] In addition, on this basis, the connection between the small diameter end of the transition section 84 and the first pipe section 80 can be chamfered in an arc shape, and the connection between the large diameter end of the transition section 84 and the second pipe section 81 can also be chamfered in an arc shape.

[0086] In the liquid collecting container 1, the liquid discharge port 82 of the capillary receiving tube 8 should not come into contact with the liquid surface that has been collected in the liquid collecting container 1. The advantages of this are: first, it avoids the influence of surface tension, buoyancy, liquid pressure and other forces caused by the liquid discharge port 82 being inserted into the liquid surface on the flow of liquid in the capillary receiving tube 8, thereby ensuring that the liquid discharge flow rate is stable and does not change due to the increase in the liquid level in the liquid collecting container 1.

[0087] Secondly, the conventional method of inserting the liquid outlet 82 below the liquid surface requires a certain amount of liquid to be pre-stored in the liquid collection container 1 to cover the liquid outlet 82, which reduces the effective weighing range, resulting in the use of a balance with a larger weighing value, which in turn causes a certain weighing error and restricts the overall measurement accuracy. However, after controlling the liquid outlet 82 of the capillary receiving tube 8 not to contact the liquid surface already collected in the liquid collection container 1, there is no need to pre-store liquid in the liquid collection container 1, and the effective weighing range accounts for at least 70% of the balance, so a balance with a smaller weighing value can be used, the minimum weighing value is further increased, and the overall measurement accuracy is significantly improved.

[0088] To achieve the above purpose, the length of the liquid discharge port 82 extending from the lower end of the sealing filler 50 needs to be determined according to the volume of the liquid to be collected in the liquid collection container 1. Specifically, the distance between the liquid discharge port 82 and the inner bottom surface of the liquid collection container 1 is greater than the height of the liquid in the accommodating cavity 101 during the measurement process.

[0089] To further reduce the evaporation of the liquid to be measured, Figure 5As shown, the micro flow measurement device in this embodiment also includes an evaporation well 11, which is arranged in the inner anti-evaporation cover 4, and the inner side of the evaporation well 11 is provided with an installation chamber 14 which penetrates along the axial direction, and the installation chamber 14 is sleeved on the outer side of the liquid collection container 1 and the weighing scale 3, and there is a gap between the liquid collection container 1 and the weighing scale 3; a second humidity adjustment structure 13 is arranged on the evaporation well, and the second humidity adjustment structure 13 is used to increase the humidity in the installation chamber. In one embodiment of the second humidity adjustment structure 13, the second humidity adjustment structure 13 includes a receiving tank opened at the upper end of the evaporation well, and the receiving tank contains evaporable liquid.

[0090] Specifically, it should be noted that in this embodiment, an evaporation well 11 is additionally arranged on the inner side of the inner anti-evaporation cover 4, and the evaporation well 11 is sleeved on the weighing scale 3 and the liquid collection container 1 through the installation chamber 14, and the evaporation well 11 maintains a gap with the weighing scale 3 and the liquid collection container 1 so that they do not contact each other, so that the weight of the evaporation well 11 will not affect the weighing scale 3. In this embodiment, the installation chamber 14 is a chamber that penetrates along the axial direction, the weighing scale 3 is located at the lower part of the installation chamber 14, and the capillary receiving tube 8 can enter the liquid collection container 1 through the upper part of the installation chamber 14.

[0091] In order to reduce the evaporation of the liquid in the liquid collection container 1, it is necessary to increase the humidity of the gas in the inner anti-evaporation cover 4. For this purpose, in this embodiment, a receiving groove 131 is provided at the upper end of the evaporation well 11, and the receiving groove 131 is filled with evaporable liquid 132. The humidity in the inner anti-evaporation cover 4 is saturated and kept constant by the evaporation of the liquid in the receiving groove 131, thereby minimizing the evaporation of the liquid in the liquid collection container 1 and further improving the measurement accuracy.

[0092] In an implementation of the receiving groove 131 , the receiving groove 131 may be configured as an annular groove opened along the circumference of the evaporation well 11 , and the annular groove is located outside the installation chamber 14 .

[0093] On the basis of the above implementation, in order to further reduce the evaporation amount of liquid, as Figure 5 As shown, the outer anti-evaporation assembly in this embodiment includes an outer wind shield 6 and an outer anti-evaporation cover 10, the outer anti-evaporation cover 10 is arranged on the top of the inner anti-evaporation cover 4, and the outer wind shield 6 is arranged on the outer side of the outer anti-evaporation cover 10 and the inner anti-evaporation cover 4; the upper end of the capillary receiving tube 8 extends into the outer anti-evaporation cover 10, and the liquid outlet 70 of the liquid outlet pipe 7 passes through the outer wind shield 6 and the outer anti-evaporation cover 10 in sequence and is horizontally aligned with the liquid receiving port 83; the outer anti-evaporation cover 10 is provided with a first humidity regulating structure 9, and the first humidity regulating structure 9 is used to increase the humidity in the outer anti-evaporation cover 10. In one embodiment of the first humidity regulating structure 9, the first humidity regulating structure 9 includes a wet water-absorbing strip embedded in the outer anti-evaporation cover 10.

[0094] Specifically, in the present embodiment, the outer evaporation prevention cover 10 is arranged on the top of the inner evaporation prevention cover 4 and is located on the inner side of the outer wind shield 6; the outer evaporation prevention cover 10 covers the portion of the capillary receiving tube 8 extending out of the inner evaporation prevention cover 4, that is, at least covers the horizontal pipe section 84 of the capillary receiving tube 8, and the liquid outlet 70 of the liquid outlet pipe 7 passes through the outer evaporation prevention cover 10, that is, the horizontal liquid outlet section is horizontally aligned with the horizontal pipe section 84 after passing through the outer evaporation prevention cover 10; a wet water absorption strip is arranged inside the outer evaporation prevention cover 10.

[0095] Specifically, since the liquid outlet 70 of the liquid outlet tube 7 and the liquid receiving port 83 of the capillary receiving tube 8 are not directly connected, and a certain distance is maintained between the two, the liquid to be measured between the liquid outlet 70 and the liquid receiving port 83 will contact with the external air, thereby causing a certain amount of evaporation. To this end, in this embodiment, an outer evaporation-proof cover 10 is arranged on the top of the inner evaporation-proof cover 4, and the liquid outlet 70 and the liquid receiving port 83 are covered by the outer evaporation-proof cover 10, and a wet water absorption strip is arranged in the outer evaporation-proof cover 10. The liquid contained in the water absorption strip can make the air humidity in the outer evaporation-proof cover 10 reach a stable humidity saturation state, so that the air humidity near the liquid outlet 70 and the liquid receiving port 83 is saturated, reducing the evaporation amount of the liquid in the process of being sucked into the capillary receiving tube 8 through the liquid receiving port 83, and further improving the measurement accuracy.

[0096] Furthermore, the water absorbing strips in this embodiment are arranged in two circles, and the two circles of water absorbing strips are respectively embedded in the inner top surface of the outer anti-evaporation cover 10 and the outer top surface of the inner anti-evaporation cover 4 .

[0097] According to another aspect of the present invention, a method for measuring a small flow rate is provided, which uses the above-mentioned small flow rate measuring device and the following steps:

[0098] The liquid of the measured flow rate is squeezed out from the liquid outlet 70 of the liquid outlet pipe 7 to form a slightly convex liquid surface;

[0099] The liquid squeezed out from the liquid outlet 70 is sucked in at a time interval of T1 by the liquid receiving port 83 of the capillary receiving tube 8;

[0100] After the liquid is discharged from the capillary receiving tube 8 and drips into the liquid collecting container 1 for the first time, the reading of the weighing balance 3 is read at each T1 time interval;

[0101] The liquid flow rate is determined based on the reading of the weighing balance 3 at each time T1.

[0102] Specifically, in this embodiment, the liquid of the measured flow rate is squeezed out from the liquid outlet 70 of the liquid outlet tube 7 to form a slightly convex liquid surface. After the liquid surface contacts the liquid receiving port 83 of the capillary receiving tube 8, it is quickly sucked in and cut off due to capillary action and gradually accumulated in the vertical part of the capillary receiving tube 8. After a certain mass of liquid is accumulated in the vertical part, the liquid drips from the liquid discharge port 82 at the lower end of the vertical part into the liquid collection container 1. Then, the mass of the current liquid collection container 1 can be obtained by the weighing balance 3, and then the mass of the dripping liquid can be obtained, so that the liquid flow rate can be obtained by the mass method. When based on the mass method, the readings of each T1 can be accumulated to calculate the liquid flow rate.

[0103] Since there is a distance between the liquid outlet 70 of the liquid outlet pipe 7 and the liquid receiving port 83 of the capillary receiving tube 8 in the present invention, the liquid squeezed out of the liquid outlet 70 needs to form a certain micro-convex liquid surface before it can be sucked into the liquid receiving port 83. In this embodiment, the time T1 is the sum of the time required to form the micro-convex liquid surface and the time required for the liquid receiving port 83 to suck the part of the liquid. Therefore, the specific value of T1 needs to be designed according to the liquid properties of the flow to be measured, the structure of the liquid outlet pipe 7 and the structure of the capillary receiving tube 8, and the specific value is not limited in this embodiment.

[0104] When the micro flow measurement device includes an evaporation well and an outer anti-evaporation cover, when measuring flow, the air humidity in the inner anti-evaporation cover and the air humidity in the outer anti-evaporation cover are first controlled to reach a set value, and then the liquid to be measured can be injected into the liquid outlet pipe to perform the above flow measurement process. During the measurement process, the air humidity in the inner anti-evaporation cover and the air humidity in the outer anti-evaporation cover can be monitored in real time, and the air humidity can be controlled at the same time, and the evaporation amount of the liquid during the measurement process can also be reduced.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Within the spirit and principle of the present invention, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present invention.

Claims

1. A liquid container for measuring micro flow, characterized in that: include: Liquid collection container: A packing component is arranged in the liquid collection container, the packing component is made of a material with low water absorption rate and is breathable, and a receiving cavity for receiving the liquid to be measured is provided between the lower end of the packing component and the bottom of the liquid collection container; The packing component is provided with a through hole for the capillary receiving tube to pass through.

2. The liquid container according to claim 1, characterized in that: The packing assembly comprises a sealing packing and an exhaust pipe, the sealing packing is made of a material with low water absorption rate, and the through hole is arranged on the sealing packing; The exhaust pipe passes through the sealing filler and is in communication with the accommodating cavity, and is used for exhausting the gas in the accommodating cavity.

3. The liquid container according to claim 2, characterized in that: The inner diameter of the exhaust pipe is smaller than the inner diameter of the liquid outlet pipe.

4. The liquid container according to claim 2, characterized in that: The sealing filler is provided with a plurality of mounting holes which penetrate in the axial direction, at least one of the mounting holes is provided with the exhaust pipe, and the other mounting holes are provided with detachable sealing plugs.

5. The liquid container according to claim 4, characterized in that: The lower end surface of the sealing plug is flush with the lower end surface of the sealing filler.

6. The liquid container according to claim 2, characterized in that: The lower end surface of the exhaust pipe is flush with or lower than the lower end surface of the sealing filler.

7. The liquid container according to claim 5, characterized in that The exhaust pipe is configured to be L-shaped, the vertical section of the exhaust pipe is disposed in the mounting hole, and the horizontal section of the exhaust pipe is located above the sealing filler.

8. A flow measurement device, characterized in that: Comprising a liquid container as described in any one of claims 1 to 7.

9. The flow measurement device according to claim 8, characterized in that: Also includes: a weighing balance, on which the liquid collection container is arranged; A capillary receiving tube, the capillary receiving tube is configured to be L-shaped, the upper and lower ends of the capillary receiving tube are respectively provided with a liquid receiving port and a liquid discharge port, the lower end of the capillary receiving tube vertically passes through the through hole and extends into the accommodating cavity, and the upper end is located above the liquid collection container and is horizontal; A liquid outlet pipe, the liquid outlet pipe includes a horizontal liquid outlet section, the end of the horizontal liquid outlet section is provided with a liquid outlet, the liquid outlet of the liquid outlet pipe is horizontally aligned with the liquid receiving port and maintains a first spacing, so that the liquid discharged from the liquid outlet is sucked into the liquid receiving port at intervals, and the liquid outlet drips the liquid into the liquid collection container at intervals.

10. The flow measurement device according to claim 9, characterized in that: The capillary receiving tube comprises a first tube section and a second tube section which are interconnected, the inner diameter of the second tube section is larger than the inner diameter of the first tube section, the second tube section vertically passes through the packing assembly and extends into the accommodating cavity, and the liquid discharge port is located at the lower end of the second tube section; The first pipe section includes a horizontal section, and the liquid receiving port is located at an end of the horizontal section.

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