A quantitative laboratory liquid metering device

Abstract

This utility model discloses a quantitative laboratory liquid metering device, relating to the field of liquid metering technology. It includes a sleeve and a telescopic cylinder axially movable within the sleeve. The telescopic cylinder contains a metering cylinder for quantitative liquid measurement. A side groove is provided through the side wall of the telescopic cylinder to allow liquid to flow into its inner cavity. This utility model, by setting a fixed ring with a smaller inner diameter at the inlet of the metering cylinder, utilizes pressure changes to automatically eliminate air bubbles without requiring an additional power device. This solves the metering deviation problem caused by air bubbles in traditional equipment and offers greater structural simplicity and ease of operation compared to vacuum defoamers.

Description

Technical Field

[0001] This utility model relates to the field of liquid measurement technology, specifically to a quantitative laboratory liquid measurement device. Background Technology

[0002] In laboratory liquid quantitative measurement scenarios, especially in fields with stringent requirements for volume accuracy such as biomedical testing, trace chemical analysis, and environmental pollutant monitoring, air bubbles in liquids have become a core obstacle affecting measurement accuracy.

[0003] However, existing quantitative laboratory liquid metering equipment still has some drawbacks in practical use: although the commonly used vacuum degassing device in the laboratory can achieve liquid degassing, the device requires a separate vacuum pump and liquid storage tank, which is large in size and cannot be integrated with small metering devices, and the operation process is cumbersome; some devices attempt to use stirring defoaming or heating defoaming, but the former will generate new turbulent bubbles due to stirring, and the latter may cause heat-sensitive reagents to be deactivated, which cannot meet the diverse reagent needs of the laboratory.

[0004] To address this issue, we designed a quantitative laboratory liquid metering device. Utility Model Content

[0005] The purpose of this invention is to provide a quantitative laboratory liquid metering device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a quantitative laboratory liquid metering device, including a sleeve and a telescopic cylinder that is axially movable and inserted into the sleeve. The telescopic cylinder is provided with a metering cylinder for quantitative measurement of liquid, and the side wall of the telescopic cylinder is provided with a side groove for allowing liquid to flow into the inner cavity of the telescopic cylinder.

[0007] Furthermore, a limiting member is fixedly connected to the top of the telescopic cylinder. The limiting member is used to abut against the inner bottom wall of the sleeve. A straight rod is fixedly connected to the top of the limiting member. The straight rod is axially movable and inserted into the top wall of the sleeve. A handle is fixedly connected to one end of the straight rod located outside the sleeve.

[0008] Furthermore, the inner wall of the bottom of the telescopic cylinder is provided with an internal thread, and a threaded ring is connected to the inner side of the internal thread, with the metering cylinder disposed inside the threaded ring.

[0009] Furthermore, a through hole is provided at the center of the threaded ring, and a rubber pad is provided inside the through hole. The rubber pad can increase the friction between the inner arc wall of the through hole and the measuring cylinder.

[0010] Furthermore, a mounting bracket is fixedly connected to the inner wall of the telescopic cylinder, and a fixing ring for defoaming is fixedly installed inside the mounting bracket.

[0011] Furthermore, the fixing ring is arranged in a ring at the upper end of the metering cylinder inlet, and the inner diameter of the fixing ring is smaller than the inner diameter of the metering cylinder.

[0012] Furthermore, the measuring cylinder is made of quartz glass.

[0013] Furthermore, the four corners of the side groove all adopt a rounded transition design.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, by setting a fixing ring with a smaller inner diameter at the inlet of the metering cylinder, the air bubbles are automatically eliminated by utilizing pressure changes. No additional power device is required, which solves the metering deviation problem caused by air bubbles in traditional equipment. Compared with vacuum deaerators, it has a simpler structure and is more convenient to operate.

[0016] 2. In this utility model, through the linkage structure of the straight rod and the handle, the experimenter can complete the liquid sampling operation without contacting the liquid. Combined with the high light transmittance of the quartz glass measuring cylinder, it not only avoids sample contamination, but also facilitates accurate reading of the liquid level scale, thereby improving operational safety and measurement accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of the sleeve of this utility model;

[0019] Figure 3 This is a cross-sectional view of the internal structure of the telescopic cylinder of this utility model;

[0020] Figure 4 This is a schematic diagram of the cross-section of the fixing ring of this utility model.

[0021] In the diagram: 1. Sleeve; 2. Telescopic cylinder; 3. Measuring cylinder; 4. Side groove; 5. Limiting component; 6. Straight rod; 7. Handle; 8. Threaded ring; 9. Through hole; 10. Mounting bracket; 11. Fixing ring. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-4 This utility model provides a technical solution: a quantitative laboratory liquid metering device, including a sleeve 1, a telescopic cylinder 2, a metering cylinder 3 and a defoaming component. The telescopic cylinder 2 is axially movably inserted into the sleeve 1. The metering cylinder 3 is fixed to the bottom of the telescopic cylinder 2 by a threaded ring 8. The defoaming component is fixed to the inlet end of the metering cylinder 3 by a mounting bracket 10.

[0024] In practice, the measuring cylinder 3 is first inserted into the through hole 9 of the threaded ring 8. The rubber pad on the inner wall of the through hole 9 is initially fixed by friction. Then, the threaded ring 8 is screwed into the internal thread at the bottom of the telescopic cylinder 2 to lock it in place, thus completing the assembly of the measuring component.

[0025] See Figure 2 The top of the telescopic cylinder 2 is connected to a straight rod 6 via a limiting member 5. The straight rod 6 passes through the top wall of the sleeve 1 and is connected to a handle 7. The limiting member 5 can abut against the inner bottom wall of the sleeve 1 to limit the telescopic stroke.

[0026] In practice, by holding the handle 7 and pulling the straight rod 6 upward, the telescopic cylinder 2 can be driven to rise along the inner wall of the sleeve 1; pushing it downward will cause the telescopic cylinder 2 to extend outside the sleeve 1. When the limiting member 5 contacts the inner bottom wall of the sleeve 1, the maximum extension is reached, thus preventing the telescopic cylinder 2 from falling off.

[0027] See Figure 3 The side groove 4 on the side wall of the telescopic cylinder 2 is rectangular, with rounded corners. The fixing ring 11 is fixed to the inside of the telescopic cylinder 2 by the mounting bracket 10 and is located directly above the inlet of the metering cylinder 3.

[0028] In practice, the telescopic cylinder 2 is pushed into the liquid to be measured. The liquid flows into the inner cavity of the telescopic cylinder 2 through the side groove 4. The arc transition structure reduces turbulence and residue when the liquid flows in. When the liquid continues to flow downward, it first passes through the narrow channel of the fixed ring 11, where the bubbles are squeezed and shrunk. After passing through the fixed ring 11, it enters the metering cylinder 3 with a larger inner diameter. The pressure drops sharply, causing the bubbles to burst, thus achieving efficient defoaming.

[0029] See Figure 3 The measuring cylinder 3 is made of quartz glass and has volume markings on its surface. It can be quickly disassembled and replaced via the threaded ring 8.

[0030] In practice, the defoamed liquid smoothly enters the measuring cylinder 3, and the experimenter observes the scale value corresponding to the lowest point of the concave liquid surface through the quartz glass to obtain the quantitative result. When it is necessary to replace the measuring cylinder 3 with a different range, the old measuring cylinder 3 can be removed by loosening the threaded ring 8, and then tightened again after replacement.

[0031] Working principle:

[0032] The telescopic cylinder 2 is installed inside the sleeve 1 via the limiting member 5. Through the threaded engagement of the internal thread and the outer surface of the threaded ring 8, the threaded ring 8 can be threaded into the lower end of the telescopic cylinder 2. At this time, the measuring cylinder 3 is inside the telescopic cylinder 2. By holding the handle 7 and pulling the straight rod 6, the telescopic cylinder 2 can be moved axially. The experimenter can push the telescopic cylinder 2 into the liquid without touching it. The telescopic cylinder 2 is completely below the liquid surface. The liquid can enter from the side groove 4, and the inlet of the measuring cylinder 3 is connected to the inner cavity of the telescopic cylinder 2, so that the liquid enters the measuring cylinder 3 and can be used for quantitative measurement.

[0033] The liquid enters the measuring cylinder 3 through the fixed ring 11. Since the inner diameter of the fixed ring 11 is smaller than the inner diameter of the measuring cylinder 3, the bubbles in the liquid are squeezed and become smaller. After passing through the fixed ring 11, they quickly become larger again. Defoaming is achieved through the sudden change in pressure.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A dosable laboratory liquid metering device comprising a sleeve (1), characterized in that, It also includes a telescopic cylinder (2) that can be axially moved and inserted into the sleeve (1). The telescopic cylinder (2) is provided with a metering cylinder (3) for quantitative measurement of liquid. The side wall of the telescopic cylinder (2) is provided with a side groove (4) for allowing liquid to flow into the inner cavity of the telescopic cylinder (2).

2. A metering device for a quantifiable laboratory liquid as claimed in claim 1, characterized in that The top of the telescopic cylinder (2) is fixedly connected to a limiting member (5), which is used to form an abutment with the inner bottom wall of the sleeve (1). A straight rod (6) is fixedly connected to the top of the limiting member (5), and the straight rod (6) is axially movable and inserted into the top wall of the sleeve (1). A handle (7) is fixedly connected to one end of the straight rod (6) located outside the sleeve (1).

3. A metering device for a quantifiable laboratory liquid as claimed in claim 2, characterized in that The telescopic cylinder (2) has an internal thread on its bottom inner wall, and a threaded ring (8) is connected to the inner side of the internal thread. The metering cylinder (3) is located inside the threaded ring (8).

4. A metering device for a quantifiable laboratory liquid as claimed in claim 3, characterized in that A through hole (9) is provided at the center of the threaded ring (8). A rubber pad is provided inside the through hole (9). The rubber pad can increase the friction between the inner arc wall of the through hole (9) and the measuring cylinder (3).

5. A metering device for a quantifiable laboratory liquid as claimed in claim 4, characterized in that The inner wall of the telescopic cylinder (2) is fixedly connected to a mounting bracket (10), and a fixing ring (11) for defoaming is fixedly installed inside the mounting bracket (10).

6. A metering device for quantifying a laboratory liquid as claimed in claim 5, characterized in that The fixing ring (11) is arranged in a ring at the upper end of the inlet of the metering cylinder (3), and the inner diameter of the fixing ring (11) is smaller than the inner diameter of the metering cylinder (3).

7. A metering device for quantifying a laboratory liquid as defined in claim 6, characterized in that The measuring cylinder (3) is made of quartz glass.

8. A metering device for quantifying a laboratory liquid as claimed in claim 7, characterized in that The four corners of the side groove (4) are all designed with rounded transitions.

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