Non-immersion type liquid weighing structure

Abstract

The utility model discloses a non-immersion type liquid weighing structure, relates to the technical field of liquid flow metering, and comprises a non-overflow beaker, a sealing cover, an injection tube and a microporous liquid absorption cushion block, the microporous liquid absorption cushion block is arranged on the inner bottom surface of the non-overflow beaker, the sealing cover is connected to the rim of the non-overflow beaker in a sealing manner, and the injection tube is connected with the non-overflow beaker in a sealing manner. The injection pipe penetrates through the sealing cover and extends into the non-overflow beaker, the injection pipe is connected with the sealing cover in a sealing mode, a lower end opening of the injection pipe is adjacent to the upper surface of the microporous liquid absorption cushion block, and a gap exists between the lower end opening of the injection pipe and the upper surface of the microporous liquid absorption cushion block. The non-immersion liquid weighing structure provided by the utility model does not need to correct the buoyancy of the injection tube in the testing process while inhibiting evaporation, does not introduce additional acting force of an oil film in the measuring process, prevents the jet flow acting force of the injection tube from influencing the mass weighing of a balance, and improves the measuring accuracy.

Description

Technical Field

[0001] This utility model relates to the field of liquid flow measurement technology, and in particular to a non-immersion liquid weighing structure. Background Technology

[0002] In the measurement of minute liquid flow rates, at the microliter / minute level and below, the non-overflow beaker method is typically used. A non-overflow beaker consists of only a single beaker. Due to the low flow rate, the impact of liquid evaporation on the flow rate must be considered during testing (evaporation reduces the mass measured by the balance, resulting in a lower mass flow rate). To effectively suppress evaporation, a common method previously used was to cover the upper surface of the liquid being measured with a layer of oil film with extremely low evaporation rate, forming a double-layer fluid (the lower layer being the liquid being measured, and the upper layer being the oil film). The syringe was then directly inserted into the liquid being measured. However, as the liquid being measured is continuously injected, the liquid level in the beaker rises, and the depth to which the syringe is immersed in the liquid increases, leading to an increase in the volume of water displaced and a corresponding increase in the buoyancy force on the syringe. This can cause the following problems:

[0003] First, it would be incorrect to correct the balance mass value affected by buoyancy using the current conventional method of using a constant coefficient, because buoyancy changes continuously as the liquid level rises, and the correction coefficient is not constant.

[0004] Second, since the oil film and the measured liquid have different densities, it is necessary to consider the effects of both on buoyancy separately. Previously, only the effect of the measured liquid on buoyancy was considered.

[0005] Third, due to the high surface tension of the oil film, it was found that during the process of the liquid level rising, its wetted perimeter (referring to the perimeter of the liquid medium in contact with the solid) is not uniformly distributed. This manifests as the contact height between the oil film and the beaker wall being random, resulting in a non-uniform distribution of tension along the wetted perimeter. As the liquid being tested is injected into the beaker, the rising liquid level causes tension to continuously act on the beaker, and the force becomes difficult to correct due to random effects.

[0006] Fourth, since the syringe is directly inserted into the liquid being tested, the fluid jet from its opening will directly affect the balance reading.

[0007] In view of this, we propose a non-immersion liquid weighing structure to solve the above-mentioned technical problems. Utility Model Content

[0008] The purpose of this invention is to provide a non-immersion liquid weighing structure to solve the problems existing in the prior art. While suppressing evaporation, it does not require correction of the buoyancy of the injection tube during the test, and will not introduce additional forces from the oil film during the measurement process. This avoids the jet force of the injection tube affecting the mass weighing of the balance and improves the measurement accuracy.

[0009] To achieve the above objectives, this utility model provides the following solution:

[0010] This utility model provides a non-immersion liquid weighing structure, including a non-overflow beaker, a sealing cap, an injection tube, and a multi-microporous liquid absorption pad. The multi-microporous liquid absorption pad is disposed on the inner bottom surface of the non-overflow beaker. The sealing cap is sealed to the mouth of the non-overflow beaker. The injection tube extends into the non-overflow beaker through the sealing cap and is sealed to the sealing cap. The lower end of the injection tube is adjacent to the upper surface of the multi-microporous liquid absorption pad and has a gap with the upper surface of the multi-microporous liquid absorption pad.

[0011] In one embodiment, the sealing cap has a through hole, through which the injection tube extends into the non-overflow beaker.

[0012] In one embodiment, a sealing oil droplet is provided between the through hole and the injection tube.

[0013] In one embodiment, the through hole is disposed in the middle of the sealing cap, and the through hole includes a first hole and a second hole that are interconnected. The first hole is located above the second hole, and the diameter of the first hole is larger than the diameter of the second hole, while the diameter of the second hole is larger than the outer diameter of the injection tube.

[0014] In one embodiment, the bottom surface of the sealing cap is provided with a sealing groove, and the side wall of the non-overflow beaker is inserted into the sealing groove.

[0015] In one embodiment, a sealing ring is provided between the sealing groove and the side wall of the non-overflow beaker.

[0016] In one embodiment, the non-overflow beaker is a cylindrical beaker.

[0017] In one embodiment, the sealing cap is a circular sealing cap.

[0018] In one embodiment, the sealing groove is an annular sealing groove, and the sealing ring is an O-ring.

[0019] In one embodiment, the multi-microporous absorbent pad is a wood pulp cotton pad.

[0020] The present invention achieves the following technical advantages over the prior art:

[0021] This invention provides a non-immersion liquid weighing structure. A sealing cap seals the mouth of a non-overflow beaker, and the injection tube is sealed to the cap, creating a closed environment inside the beaker. This suppresses evaporation of the liquid. For flow rate measurements in micro-nanoliters per minute, the thickness of the multi-porous absorbing pad is increased to absorb the liquid flowing out during the test without causing oversaturation. A gap is maintained between the lower edge of the injection tube and the multi-porous absorbing pad (the two do not contact each other). When the liquid flows out from the lower edge of the injection tube, the resulting droplets are absorbed by the capillary force of the multi-porous absorbing pad. This eliminates the need to correct the buoyancy of the injection tube during the test, avoids introducing additional forces from the oil film during measurement, and prevents the jet force of the injection tube from affecting the balance's mass, thereby improving the accuracy of the measurement results. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the non-immersion liquid weighing structure in an embodiment of the present invention.

[0024] In the diagram: 1-Non-overflow beaker, 2-Sealing cap, 3-Injection tube, 4-Multi-microporous liquid suction pad, 5-Through hole, 6-Sealing oil droplet, 7-Sealing groove, 8-Balance weighing tray. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a non-immersion liquid weighing structure to solve the problems existing in the prior art. While suppressing evaporation, it does not require correction of the buoyancy of the injection tube during the test, and does not introduce additional forces from the oil film during the measurement process. This avoids the jet force of the injection tube affecting the mass weighing of the balance and improves the measurement accuracy.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, this embodiment provides a non-immersion liquid weighing structure, including a non-overflow beaker 1, a sealing cap 2, an injection tube 3, and a multi-microporous liquid absorption pad 4. The multi-microporous liquid absorption pad 4 is disposed on the inner bottom surface of the non-overflow beaker 1. The sealing cap 2 is sealed and connected to the mouth of the non-overflow beaker 1. The injection tube 3 passes through the sealing cap 2 and extends into the non-overflow beaker 1. The injection tube 3 is sealed and connected to the sealing cap 2. The lower end of the injection tube 3 is adjacent to the upper surface of the multi-microporous liquid absorption pad 4 and has a gap with the upper surface of the multi-microporous liquid absorption pad 4.

[0029] The mouth of the non-overflow beaker 1 is sealed by the sealing cap 2, and the injection tube 3 is sealed to the sealing cap 2, so that a closed environment is formed inside the non-overflow beaker 1, which can suppress the evaporation of the liquid inside the beaker. At the same time, for the measurement of micro-nano liters / minute flow rate, by increasing the thickness of the multi-microporous absorbing pad 4, it is sufficient to absorb the liquid flowing out during the test without making it oversaturated. A certain gap is reserved between the lower edge of the injection tube 3 and the multi-microporous absorbing pad 4 (the two do not contact each other). When the liquid to be tested flows out from the lower edge of the injection tube 3, the droplets formed are absorbed by the multi-microporous absorbing pad 4 due to the capillary force. In this way, there is no need to correct the buoyancy of the injection tube 3 during the test, and no additional force of the oil film is introduced during the measurement. It also avoids the jet force of the injection tube 3 from affecting the mass weighing of the balance. When the non-overflow beaker 1 is placed on the weighing pan 8 of the balance for measurement, the accuracy of the measurement results can be improved.

[0030] In this embodiment, the sealing cap 2 has a through hole 5 located in the middle of the sealing cap 2. The through hole includes a first hole and a second hole that are interconnected. The first hole is located above the second hole, and the diameter of the first hole is larger than the diameter of the second hole. The diameter of the second hole is larger than the outer diameter of the injection tube 3. The injection tube 3 passes through the first hole and the second hole in sequence and extends into the non-overflow beaker 1. A sealing oil droplet 6 is provided between the through hole 5 and the injection tube 3. The evaporation rate of the oil droplet is extremely low, and its impact on the measurement process is negligible. Due to the high surface tension of the oil medium, it can fill the gap between the through hole 5 and the injection tube 3 without leakage. Thus, together with the sealing cap 2, a sealed environment is formed inside the beaker, which suppresses the evaporation of the liquid inside the beaker and avoids introducing additional forces of the oil film during the measurement process.

[0031] In this embodiment, the bottom surface of the sealing cap 2 is provided with a sealing groove 7, and the side wall of the mouth of the non-overflow beaker 1 is inserted into the sealing groove 7. A sealing ring is provided between the sealing groove 7 and the side wall of the mouth of the non-overflow beaker 1 to ensure the sealing performance between the sealing cap 2 and the non-overflow beaker 1.

[0032] In this embodiment, the non-overflow beaker 1 is a cylindrical beaker, the sealing cap 2 is a circular sealing cap, the sealing groove 7 is an annular sealing groove, and the sealing ring is an O-ring.

[0033] In this embodiment, the microporous absorbent pad 4 is a wood pulp cotton pad. However, it is not limited to wood pulp cotton pads; other materials with porous structures and good absorbency can also be used.

[0034] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A non-submersible liquid weighing structure, characterized by: The device includes a non-overflow beaker, a sealing cap, an injection tube, and a multi-microporous suction pad. The multi-microporous suction pad is disposed on the inner bottom surface of the non-overflow beaker. The sealing cap is sealed to the mouth of the non-overflow beaker. The injection tube extends into the non-overflow beaker through the sealing cap and is sealed to the sealing cap. The lower end of the injection tube is adjacent to the upper surface of the multi-microporous suction pad and has a gap with the upper surface of the multi-microporous suction pad.

2. The non-submersible liquid weighing structure according to claim 1, characterized in that: The sealing cap has a through hole, through which the injection tube extends into the non-overflow beaker.

3. The non-submersible liquid weighing structure according to claim 2, characterized in that: A sealing oil droplet is provided between the through hole and the injection tube.

4. The non-submersible liquid weighing structure according to claim 2, characterized in that: The through hole is located in the middle of the sealing cap. The through hole includes a first hole and a second hole that are interconnected. The first hole is located above the second hole. The diameter of the first hole is larger than the diameter of the second hole, and the diameter of the second hole is larger than the outer diameter of the injection tube.

5. The non-submersible liquid weighing structure according to claim 1, characterized in that: The bottom surface of the sealing cap is provided with a sealing groove, and the side wall of the non-overflow beaker is inserted into the sealing groove.

6. The non-submersible liquid weighing structure according to claim 5, characterized in that: A sealing ring is provided between the sealing groove and the side wall of the non-overflow beaker.

7. The non-submersible liquid weighing structure according to claim 6, characterized in that: The non-overflow beaker is a cylindrical beaker.

8. The non-submersible liquid weighing structure of claim 1, wherein: The sealing cap is a circular sealing cap.

9. The non-submersible liquid weighing structure according to claim 7, characterized in that: The sealing groove is an annular sealing groove, and the sealing ring is an O-ring.

10. The non-submersible liquid weighing structure of claim 1, wherein: The microporous absorbent pad is a wood pulp cotton pad.

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