Automatic liquid density measuring instrument

Abstract

An automatic liquid density measuring instrument comprises a plunger pump, a high-pressure air pump, a six-way valve, a cylindrical tube, a transparent glass tube, a constant-temperature water bath box, a peristaltic pump, an infrared transmitting tube, an infrared receiving tube, an optocoupler box and a cap. The problems that when the density of the viscous liquid is manually measured, a measuring cylinder is not easy to clean after measurement, and an automatic U-shaped oscillation tube method cannot be used for measuring the density of the viscous liquid are solved, the density of the viscous liquid can be conveniently and rapidly measured, and the measurement accuracy is improved. And the automatic density measuring instrument can be used for cleaning the measuring device without residues after the measurement is finished. The method is particularly suitable for popularization and application in the fields of petroleum, medicine and industrial production, and the market prospect is very wide.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laboratory experiments and detection, in particular to a kind of automatic measuring instrument for measuring the density of viscous liquid. BACKGROUND

[0002] Density is one of the important physical properties of liquid, which has extremely important significance in scientific research and industrial production, and in petroleum, medicine and industrial production, accurate measurement of the density of liquid is needed. At present, the density of many liquids on the market needs to be measured, especially the density of viscous liquid, which is often measured manually, and the measuring cylinder is not easy to clean after measurement, and the automatic U-shaped oscillating tube method cannot be used to measure the density of viscous liquid. Therefore, it is of great significance to invent a kind of density automatic measuring instrument which can measure the density of viscous liquid conveniently and quickly, and can clean the measuring device without residue after measurement. SUMMARY

[0003] The present application is to solve the above-mentioned deficiencies and needs of the prior art, and to provide a kind of density automatic measuring instrument which is simple in structure, ingenious in design, can measure the density of viscous liquid conveniently and quickly, and can clean the measuring device without residue after measurement.

[0004] Therefore, it is necessary to disclose a method or device that can solve the above problems, a kind of liquid density automatic measuring instrument, including liquid transmission device, photoelectric sensing device, control panel, machine shell, one ten thousandth balance, constant temperature water bath box, the liquid transmission device includes high pressure gas pump, plunger pump, six-way valve, atmospheric short pipe, pure water transfer pipe, cylindrical pipe, cap, cleaning fluid transfer pipe, transparent glass tube, peristaltic pump A, peristaltic pump B, hose, the photoelectric sensing device includes infrared emitter tube, infrared receiving tube, optocoupler box.

[0005] The six-way valve of the aforementioned automatic liquid density measuring instrument has six ports: P, T, A, B, X, and Y. Port P is connected to a plunger pump; port T is connected to one end of a transparent glass tube via a flexible hose; port A is connected to a high-pressure air pump; port B is connected to the atmosphere via a short pipe; port X is connected to a cleaning fluid bottle via a peristaltic pump (B); and port Y is connected to a purified water bottle via a peristaltic pump (A). The transparent glass tube passes through an optical coupler box and is tightly wound several times around the upper end of a cylindrical tube to form a spiral tube at the lower end. The other end of the transparent glass tube passes through a cap removal ring and is fitted with a cap. The cylindrical tube is placed inside a constant temperature water bath, which is fixedly installed on a slide table inside the machine housing. The movement of the slide table allows a transparent glass tube with a cap to be inserted into the sample to be tested. The infrared emitting tube and the infrared receiving tube are fixed by an optical coupler box, which sandwiches the transparent glass tube inside the optical coupler box. The light emitted by the infrared emitting tube can pass through the transparent glass tube inside the optical coupler box and be received by the infrared receiving tube. The plunger pump, high-pressure air pump, six-way valve, peristaltic pump A, and peristaltic pump B are respectively connected to the control system. The entire device constitutes an automatic liquid density measuring instrument. When the density of the liquid is determined and the remaining liquid in the device needs to be thoroughly cleaned, first, control the six-way valve to open between terminals A and T and close the other ports. Use a high-pressure air pump to blow the liquid in the tube into the recovery bottle. Then, control the six-way valve to open between terminals T and X and close the other ports. Use peristaltic pump B to draw the cleaning fluid from the cleaning fluid bottle through the cleaning fluid transfer tube and inject the cleaning fluid into the transparent glass tube to perform the first step of cleaning the remaining liquid in the tube. After completing the first step of cleaning, open terminals T and Y and close the other terminals. Use peristaltic pump A to draw the purified water from the purified water bottle through the purified water transfer tube and inject the purified water into the transparent glass tube to rinse the remaining liquid in the tube. After completing the second step of rinsing, open terminals T and A and close the other terminals. Let the airflow from the high-pressure air pump flow into the transparent glass tube and use the airflow to carry away the remaining liquid in the transparent glass tube, thus completing the thorough cleaning of the remaining liquid in the device.

[0006] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0007] This invention discloses an automatic liquid density measuring instrument with a simple structure and ingenious design. It addresses the problems of traditional liquid density measurement methods, such as the difficulty in cleaning the measuring cylinder after manual measurement of viscous liquids and the inapplicability of the automatic U-shaped oscillating tube method for measuring the density of viscous liquids. This invention provides an automatic measuring instrument for viscous liquids, capable of accurately measuring the density of viscous liquids and quickly and thoroughly cleaning any residual liquid in the tube after measurement. It is not only low-cost but also possesses numerous advantages, making it particularly suitable for widespread application in this field, with a very broad market prospect. Attached Figure Description

[0008] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, do not constitute an undue limitation of the invention.

[0009] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram illustrating the principle of an embodiment of the present invention.

[0011] Figure 3 This is a schematic diagram showing the numbering distribution of the ports of the six-way valve in an embodiment of the present invention.

[0012] Among them, the components are: liquid transfer device 01, photoelectric sensor device 02, control panel 03, housing 04, 1 high-pressure air pump, 2 plunger pump, 3 six-way valve, 4 slide table, 5 short pipe for connecting to the atmosphere, 6 infrared emitting tube, 7 optocoupler box, 8 infrared receiving tube, 9 pure water bottle, 10 pure water transfer tube, 11 cylindrical tube, 12 cap removal ring, 13 cap head, 14 cleaning fluid bottle, 15 cleaning fluid transfer tube, 16 transparent glass tube, 17 constant temperature water bath, 18 liquid bottle to be tested, 19. 0.0001g balance, 20. peristaltic pump A, 21. peristaltic pump B, and 22 hose. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention is not limited to the specific embodiments disclosed below.

[0014] Please see Figure 1 This invention provides an automatic liquid density measuring instrument, comprising a liquid transfer device 01, a photoelectric sensor 02, a control panel 03, a housing 04, a slide 4, a pure water bottle 9, a cap removal ring 12, a cleaning fluid bottle 14, a constant temperature water bath 17, a bottle of liquid to be tested 18, and a balance 19. The liquid transfer device 01 includes a high-pressure air pump 1, a plunger pump 2, a six-way valve 3, a short pipe connected to the atmosphere 5, a pure water transfer pipe 10, a cylindrical tube 11, a cap 13, a cleaning fluid transfer pipe 15, a transparent glass tube 16, a peristaltic pump A 20, a peristaltic pump B 21, and a flexible tube 22. The photoelectric sensor 02 includes an infrared emitting tube 6, an infrared receiving tube 8, and an optocoupler box 7.

[0015] Please see Figure 2The six-way valve 3 of the automatic liquid density measuring instrument has six ports: P, T, A, B, X, and Y. Port P is connected to a plunger pump 2; port T is connected to one end of a transparent glass tube 16 via a flexible hose 22; port A is connected to a high-pressure air pump 1; port B is connected to the atmosphere via an atmospheric short pipe 5; port X is connected to a cleaning fluid bottle 14 via a peristaltic pump 21; and port Y is connected to a purified water bottle 9 via a peristaltic pump 20. The transparent glass tube 16 passes through an optical coupler box 7 and is tightly wound several times around the upper end of a cylindrical tube 11, forming a spiral tube shape. The other end of the transparent glass tube 16 passes through a cap removal ring 12 and is fitted with a cap 13. The cylindrical tube 11 is placed inside the constant temperature water bath box 17, which is fixedly installed on the slide table 4. The transparent glass tube 16 with the cap 13 attached to one end can be inserted into the liquid bottle 18 to be tested by the movement of the slide table 4. The infrared emitting tube 6 and the infrared receiving tube 8 are fixed by the optical coupler box 7, which clamps the transparent glass tube 16 inside the optical coupler box 7 from both sides. The light emitted by the infrared emitting tube 6 can pass through the transparent glass tube 16 inside the optical coupler box 7 and be received by the infrared receiving tube 8. The plunger pump 2, the high pressure air pump 1, the six-way valve 3, the peristaltic pump A 20, and the peristaltic pump B 21 are respectively connected to the control system. The whole device constitutes an automatic liquid density measuring instrument.

[0016] Specifically, in the embodiments of the present invention, the transparent glass tube 16 adjusts the required liquid volume by selecting different internal cross-sectional areas, tube lengths, and relative positions with the optical coupler box 7.

[0017] The working process of an automatic liquid density measuring instrument according to a specific embodiment of the present invention is as follows:

[0018] The liquid bottle 18 to be tested is placed on the balance 19 with a volume of 0.01% and zeroed. Then, the slide 4 is controlled to slide vertically downwards so that the transparent glass tube 16 with the cap 13 at one end is inserted into the liquid bottle 18, and the liquid level in the liquid bottle 18 does not exceed the top of the cap 13. The plunger pump 2 starts working, and at the same time, the P and T ends of the six-way valve 3 are connected, while the other ends are closed. The liquid to be tested is drawn upwards along the transparent glass tube 16. When the liquid in the transparent glass tube 16 reaches the specified volume V, the infrared rays emitted by the infrared emitting tube 6 will pass through the liquid in the transparent glass tube 16, affecting the propagation of the infrared rays. The infrared receiving tube 8 located on the other side of the transparent glass tube 16 receives and detects the infrared rays affected by the liquid, causing a voltage change. The voltage change is transmitted to the control system, and the control system immediately stops the plunger pump 2. At the same time, the slide 4 slides upwards, causing the transparent glass tube 16 with the cap 13 at one end to be drawn out of the liquid bottle 18. The cap removal ring 12 is fixed on the housing 04, and its position is fixed. As the transparent glass tube 16 with the cap 13 attached rises to a certain height, the cap 13 is blocked by the cap removal ring 12 and adheres to the lower end of the cap removal ring 12. The transparent glass tube 16, however, is unaffected by the cap removal ring 12 and continues to be pulled upwards until the cap 12 is completely detached from the transparent glass tube 16 and falls into the test liquid bottle 18. Because the transparent glass tube 16 and the cap 12 are fitted together, and the liquid level in the test liquid bottle 18 does not exceed the top of the cap 13, the pulling... No residue will remain on the outer wall of the transparent glass tube 16, and any residue adhering to the cap 13 will fall into the liquid bottle 18 along with the cap 13. Therefore, the actual volume of liquid drawn, V1, is exactly the same as the specified volume, V. Since the cylindrical tube 11 is completely placed inside the constant temperature water bath 17, the temperature of the liquid inside the spiral tube is not affected by the external temperature, but is the same as the water temperature inside the constant temperature water bath. Therefore, the density of the liquid inside the glass spiral tube will not change due to changes in the external temperature. At this point, the volume of liquid drawn, V1, is known, and the mass of the drawn liquid, m, is equal to the mass displayed on the balance, m1, minus the mass of the cap, m2.

[0019] Therefore, according to the density calculation formula: ρ= We can derive the density of the measured liquid as:

[0020] ρ=

[0021] When the density of the liquid is determined and the remaining liquid in the device needs to be thoroughly cleaned, first, control the A and T ends of the six-way valve 3 to be connected and close the other ports. Use the high-pressure air pump 1 to quickly blow the liquid in the tube into the recovery bottle. Then, control the T and X ends of the six-way valve 3 to be connected and close the other ports. Use the peristaltic pump 21 to draw the cleaning fluid from the cleaning fluid bottle 14 through the cleaning fluid transfer tube 15 and inject the cleaning fluid into the transparent glass tube 16 to perform the first step of cleaning the remaining liquid in the tube. After completing the first step of cleaning, connect the T and Y ends and close the other ends. Use the peristaltic pump 21 to draw the pure water from the pure water bottle 9 through the pure water transfer tube 10. Then close the Y end and inject the pure water into the transparent glass tube 16 to rinse the remaining liquid in the tube. After completing the second step of rinsing, connect the T and A ends and close the other ends. Flow the air from the high-pressure air pump 1 into the transparent glass tube 16 and use the airflow to carry away the remaining liquid in the transparent glass tube 16, thus completing the thorough cleaning of the remaining liquid in the device.

[0022] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only for helping to understand the principles of the embodiments of the present invention. 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 embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An automatic liquid density measuring instrument, comprising a liquid transfer device, a photoelectric sensor, a control panel, a housing, a 0.01% balance, and a constant temperature water bath. The liquid transfer device includes a high-pressure air pump, a plunger pump, a six-way valve, a short pipe connected to atmospheric pressure, a pure water transfer pipe, a cylindrical tube, a cap, a cleaning fluid transfer pipe, a transparent glass tube, peristaltic pump A, peristaltic pump B, and a flexible tube. The photoelectric sensor includes an infrared emitting tube, an infrared receiving tube, and an optocoupler box. The six-way valve of the automatic liquid density measuring instrument has six ports: P, T, A, B, X, and Y. Port P is connected to the plunger pump, and port T is connected to the transparent glass tube via a flexible tube. One end of a transparent glass tube is connected to a high-pressure air pump (end A), end B is connected to the atmosphere via a short tube, end X is connected to a cleaning solution bottle via peristaltic pump B, and end Y is connected to a purified water bottle via peristaltic pump A. The transparent glass tube passes through an optical coupler box and is tightly wound several times around the upper end of a cylindrical tube to form a spiral tube at the lower end. The other end of the transparent glass tube passes through a cap removal ring and is fitted with a cap. The cylindrical tube is placed in a constant-temperature water bath box, which is fixedly mounted on a slide table. The movement of the slide table allows the transparent glass tube with the capped end to be inserted into the sample to be tested. The infrared emitting tube and the infrared receiving tube are connected via an optical coupler. The optical coupler box is fixed, with the transparent glass tube inside the box sandwiched on both sides. The light emitted by the infrared emitting tube can pass through the transparent glass tube inside the optical coupler box and be received by the infrared receiving tube. The plunger pump, high-pressure air pump, six-way valve, peristaltic pump A, and peristaltic pump B are respectively connected to the control system. The entire device constitutes an automatic liquid density measuring instrument. When the liquid density measurement is completed and the residual liquid in the device needs to be thoroughly cleaned, first, the A and T ends of the six-way valve must be connected while the other ports are closed. The high-pressure air pump is then used to blow the liquid in the tube into a recovery bottle. Then, the T and X ends of the six-way valve are connected while the other ports are closed. The peristaltic pump A is then used to blow the liquid out of the tube into a recovery bottle. Pump B draws cleaning fluid from the cleaning fluid bottle through the cleaning fluid transfer tube and injects it into the transparent glass tube to perform the first step of cleaning the residual liquid in the tube. After the first step of cleaning is completed, the T and Y ends are connected and the other ends are closed. Peristaltic pump A draws pure water from the pure water bottle through the pure water transfer tube and injects it into the transparent glass tube to rinse the residual liquid in the tube. After the second step of rinsing is completed, the T and A ends are connected and the other ends are closed. The airflow from the high-pressure air pump is introduced into the transparent glass tube to carry away the residual liquid in the transparent glass tube, thus completing the thorough cleaning of the residual liquid in the device.

2. The automatic liquid density measuring instrument according to claim 1, characterized in that it is transparent. One end of the glass tube is fitted with a cap. The liquid level does not exceed the top of the cap. When the slide moves upward, the cap is blocked by the cap removal ring and detaches from the transparent glass tube, falling into the bottle of liquid to be tested. This ensures that the liquid to be tested does not stick to the outer wall of the transparent glass tube when it is extracted. The mass of the extracted liquid can be calculated by subtracting the mass of the cap from the mass displayed on the balance.

3. The automatic liquid density measuring instrument according to claim 1 or 2, characterized in that: The control system detects the liquid level of the pumped liquid using an infrared transmitter and receiver. When the specified volume is reached, the control system immediately stops the plunger pump.

4. The automatic liquid density measuring instrument according to any of the preceding claims, characterized in that: By controlling the six-way valve, peristaltic pump, and high-pressure air pump, the residual liquid inside the device is thoroughly cleaned using cleaning fluid, pure water, and high-pressure airflow.

Images