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CN-224202533-U - Liquid level detection device and exosome purification waste liquid collecting equipment

CN224202533UCN 224202533 UCN224202533 UCN 224202533UCN-224202533-U

Abstract

The utility model relates to a liquid level detection device and exosome purification waste liquid collection equipment, wherein the liquid level detection device is matched with a vacuum waste liquid tank for exosome purification waste liquid collection, and comprises a shielding object, a liquid level detection device and a liquid level detection device, wherein the shielding object is arranged in the vacuum waste liquid tank, can float on the liquid level of the vacuum waste liquid tank when liquid is stored in the vacuum waste liquid tank, and can synchronously lift along with the liquid level of the vacuum waste liquid tank; the photoelectric assemblies are arranged outside the vacuum waste liquid tank, the photoelectric assemblies are arranged into two groups, namely a first photoelectric assembly corresponding to the upper position of the vacuum waste liquid tank and a second photoelectric assembly corresponding to the lower position of the vacuum waste liquid tank, and the photoelectric assemblies and the shielding object are matched for liquid level detection. According to the utility model, the scheme of detecting the liquid level by combining the shielding object and the photoelectric component can avoid the influence of a complex liquid environment, and particularly can avoid the problem of intermediate state interference of bubbles, so that the liquid level detection is more accurate, the false alarm probability is reduced, and the bubbles are prevented from entering the filtrate bag.

Inventors

  • YANG YIJIE
  • CHI SHURUI
  • SHAN FENG

Assignees

  • 深圳汇芯生物医疗科技有限公司

Dates

Publication Date
20260505
Application Date
20250512

Claims (10)

  1. 1. A liquid level detection device, use with vacuum waste liquid jar (1) that is used for exosome purification waste liquid to collect, its characterized in that includes: The shielding object (5) is arranged inside the vacuum waste liquid tank (1), and when liquid is stored in the vacuum waste liquid tank (1), the shielding object (5) floats on the liquid surface of the vacuum waste liquid tank (1) and synchronously rises and falls along with the liquid surface of the vacuum waste liquid tank (1); The photoelectric assembly (6) is arranged outside the vacuum waste liquid tank (1), the photoelectric assemblies (6) are arranged into two groups, namely a first photoelectric assembly corresponding to the upper position of the vacuum waste liquid tank (1) and a second photoelectric assembly corresponding to the lower position of the vacuum waste liquid tank (1), and the photoelectric assemblies (6) and the shielding object (5) are matched for liquid level detection.
  2. 2. The liquid level detection device according to claim 1, characterized in that the screen (5) is an opaque solid object.
  3. 3. The liquid level detection device according to claim 1, wherein the photoelectric assembly (6) comprises a light emitting element (61) arranged at the side of the vacuum waste liquid tank (1) and a photosensitive element (62) arranged at the other side of the vacuum waste liquid tank (1), and the light emitting element (61) and the photosensitive element (62) are equal in height and are arranged opposite to each other.
  4. 4. The liquid level detection device according to claim 1, wherein the height of the first photoelectric component is set in the range of 80% -85% of the total height of the tank body of the vacuum waste liquid tank (1).
  5. 5. The liquid level detection device according to claim 1, characterized in that the height of the second photoelectric assembly is arranged in the interval of 15% -20% of the total height of the tank body of the vacuum waste liquid tank (1).
  6. 6. The liquid level detection device according to claim 1, characterized in that the screen (5) is constructed as a rectangular body structure of uniform mass.
  7. 7. The liquid level detection device according to claim 6, characterized in that the width of the screen (5) is larger than 1/2 of the width or diameter of the vacuum waste liquid tank (1).
  8. 8. The liquid level detection device according to claim 6, wherein the bottom of the shielding object (5) is further provided with an openable counterweight cavity, and an adjustable counterweight substance is embedded in the counterweight cavity.
  9. 9. The liquid level detection device according to claim 1, characterized in that the screen (5) is coated with a hydrophobic material or the surface of the screen (5) is coated with a hydrophobic coating.
  10. 10. An exosome purification waste liquid collecting device, characterized by, including vacuum waste liquid jar (1) and filtrate bag (2), the entry end of filtrate bag (2) is connected through pipeline (3) to the exit end of vacuum waste liquid jar (1), pipeline (3) are connected with pump body (4), liquid level detection device of any one of claims 1-9 is connected to vacuum waste liquid jar (1).

Description

Liquid level detection device and exosome purification waste liquid collecting equipment Technical Field The utility model relates to the technical field of liquid level detection, in particular to a liquid level detection device and exosome purification waste liquid collection equipment. Background In the purification process of the exosome, the disposable vacuum waste liquid tank is required to be used for collecting and purifying waste liquid, the waste liquid in the vacuum waste liquid tank is discharged to an off-machine filtrate bag through a peristaltic pump, and a liquid level detection switch is arranged on the vacuum waste liquid tank to realize the accurate control of liquid discharge. The liquid level detection switch is based on different physical characteristics and mainly comprises a float type, a capacitance type, an ultrasonic type, a tuning fork type and a photoelectric type, wherein the float type liquid level detection switch mainly comprises a magnetic float, a limit guide rod/limit guide groove and a magnetic spring switch, the structure is not suitable for liquid containing more impurities, a sensor is required to be contacted with the liquid or integrated into a container, the capacitance type liquid level detection switch comprises a metal rod and a metal tube, the metal rod is used as a polar plate, the metal tube is used as another polar plate, a capacitor is formed between the metal rod and the metal tube, the structure is easy to influence measurement precision by electromagnetic interference, the sensor is required to be contacted with the liquid or integrated into the container, the pressure type liquid level detection switch comprises a pressure transmitter and a reference pressure source, the pressure transmitter is arranged on the bottom or on the side wall of the container, the reference pressure source can be atmospheric pressure or other constant pressure source, the sensor is easy to be influenced by factors such as temperature, density, viscosity and the like, the sensor is required to be contacted with the liquid or integrated into the container, the photoelectric type liquid level switch generally comprises a light emitting diode and a photoelectric sensor, the principle is easy to realize error detection by light scattering or air absorption, and the liquid level detection principle is easy to trigger by the liquid turbidity. In a simple photoelectric detection scheme, a signal threshold value received by a photoelectric element has an intermediate state, namely, assuming that the signal intensity of complete shielding is 0 and the signal intensity of non-shielding is 22000, the threshold value without liquid is 12000-22000, the threshold value with liquid is 0-8000, the intermediate state (8000-12000) is the signal threshold value of foam or gas-liquid interface, but the demarcation point is not absolute, for example, the signal threshold value obtained by diluted bubbles or dense bubbles on a light path is different, the signal threshold value can be in a state with liquid or without liquid, and the test cannot be carried out in all states, so false alarm is easy to cause. On the other hand, a vacuum waste liquid tank for collecting purification waste liquid generally contains multiple bubbles, and if a large amount of gas enters an off-machine filtrate bag, the bag expansion and the like are caused, so that a liquid level detection device capable of assisting the liquid discharge of the purification waste liquid tank is needed. Disclosure of utility model The utility model aims to provide a liquid level detection device and exosome purification waste liquid collection equipment, which can at least partially solve the technical problems mentioned in the background art. In order to achieve the above purpose, the present utility model provides the following technical solutions: The utility model discloses a liquid level detection device which is matched with a vacuum waste liquid tank for collecting waste liquid purified by an exosome, and comprises a shielding object and a photoelectric assembly, wherein the shielding object is arranged inside the vacuum waste liquid tank, when liquid is stored in the vacuum waste liquid tank, the shielding object can float on the liquid level of the vacuum waste liquid tank and synchronously lift along with the liquid level of the vacuum waste liquid tank, the photoelectric assembly is arranged outside the vacuum waste liquid tank, the photoelectric assemblies are arranged into two groups, namely a first photoelectric assembly corresponding to the upper position of the vacuum waste liquid tank and a second photoelectric assembly corresponding to the lower position of the vacuum waste liquid tank, and the photoelectric assembly and the shielding object are matched for detecting the liquid level. In a preferred embodiment, the barrier is an opaque solid object. In a preferred embodiment, the photoelectric assembly comprises a light