Sheath flow impedance counting liquid path system

Abstract

The utility model belongs to the technical field of medical detection equipment, and particularly relates to a sheath flow impedance counting liquid path system which comprises a sheath flow tank, a liquid inlet of the sheath flow tank is connected with a liquid storage tank through a pipeline, an air outlet of the sheath flow tank is connected with an air inlet of an air pump through a pipeline, and the air pump provides negative pressure for the sheath flow tank. The sheath liquid in the liquid storage tank enters the sheath flow tank through a pipeline, an air outlet of the air pump is connected with an air inlet of the positive pressure tank through a pipeline, an air outlet of the positive pressure tank is connected with an air inlet of the sheath flow tank through a pipeline, air in the positive pressure tank enters the sheath flow tank, and the sheath liquid in the sheath flow tank is supplied to the sheath flow counting unit through a liquid outlet pipe. When the pressure in the positive pressure tank reaches a certain value, gas in the positive pressure tank enters the sheath flow tank, sheath liquid in the sheath flow tank is pressed into the sheath flow counting unit, and the liquid path system accurately supplies liquid to the sheath flow counting unit while tank bodies are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of beverage machines, in particular to a sheath flow impedance counting liquid path system. Background Art

[0002] The principle of sheath flow impedance counting is to arrange the particles to be measured suspended in the electrolyte through a small hole (gem hole) at a time, and install an electrode (one positive electrode and one negative electrode) on both sides of the small hole. The positive and negative electrodes are connected to the electrolyte before and after the small hole (gem hole) to form a constant current source. When the particles to be measured pass through the small hole, the overall conductivity of the electrolyte will change, thereby causing the resistance to change and generating a corresponding voltage pulse signal. The liquid path system of the existing sheath flow impedance counting includes a liquid storage tank, a positive pressure tank, a negative pressure tank, a sheath flow tank, a buffer tank, an air pump, etc., but the blood cell analyzer is generally small in size and has a large number of tanks, which will take up a lot of space in the layout. Utility Model Content

[0003] In order to overcome the above-mentioned defects in the prior art, the utility model provides a sheath flow impedance counting liquid path system.

[0004] A liquid circuit system for sheath flow impedance counting includes a sheath flow tank, wherein the liquid inlet of the sheath flow tank is connected to a liquid storage tank via a pipeline, the air outlet of the sheath flow tank is connected to the air inlet of an air pump via a pipeline, the air pump provides negative pressure for the sheath flow tank, so that the sheath liquid in the liquid storage tank enters the sheath flow tank through the pipeline, the air outlet of the air pump is connected to the air inlet of a positive pressure tank via a pipeline, the air outlet of the positive pressure tank is connected to the air inlet of the sheath flow tank via a pipeline, the gas in the positive pressure tank enters the sheath flow tank, and the sheath liquid in the sheath flow tank is supplied to a sheath flow counting unit via a liquid outlet pipe.

[0005] Furthermore, a liquid float is provided in the sheath flow tank, and the liquid float is sleeved on the outer wall of the fixed column. The fixed column is provided with an upper limit ring and a lower limit ring, and the liquid float is located between the upper limit ring and the lower limit ring.

[0006] Furthermore, the sheath flow tank includes an end cover and a tank body, the fixing column is fixedly installed at the bottom of the end cover, and a sealing ring is provided at the connection between the end cover and the cover body.

[0007] Furthermore, the end cover is fixedly connected to the bracket.

[0008] Furthermore, a liquid valve is provided on the pipeline between the liquid storage tank and the sheath flow tank, and a negative pressure air valve is provided on the pipeline between the air pump and the sheath flow tank.

[0009] Furthermore, an input air valve and a one-way valve are provided on the pipeline between the air pump and the positive pressure tank, and an output air valve is provided on the pipeline between the positive pressure tank and the sheath flow tank.

[0010] Furthermore, the positive pressure tank is also connected to a pressure relief valve and a pressure sensor.

[0011] Furthermore, the sheath flow tank is also connected to a liquid level sensor.

[0012] Due to the adoption of the above technical scheme, the beneficial technical effect of the utility model is as follows: in the utility model, the air pump is started, the gas in the sheath flow tank flows out, and a negative pressure is formed in the sheath flow tank, thereby sucking the sheath liquid in the liquid storage tank into the sheath flow tank. After the liquid in the sheath flow tank reaches a certain amount, the air pump stops extracting air from the sheath flow tank and starts blowing air into the positive pressure tank. When the pressure in the positive pressure tank reaches a certain value, the gas in the positive pressure tank enters the sheath flow tank, and the sheath liquid in the sheath flow tank is pressed into the sheath flow counting unit. Through the above technical scheme, the sheath flow counting unit is accurately supplied with liquid, while the liquid path system of the sheath flow impedance counting is simplified, and the space occupied by it is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a liquid path system for sheath flow impedance counting according to the present invention;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the sheath flow tank in the present invention.

[0015] In the figure, 1. air pump, 2. input air valve, 3. one-way valve, 4. positive pressure tank, 5. pressure relief valve, 6. pressure sensor, 7. output air valve, 8. sheath flow tank, 81. end cover, 82. tank body, 9. liquid valve, 10. liquid storage tank, 11. liquid level sensor, 12. negative pressure air valve, 14. liquid outlet pipe, 15. bracket, 16. sealing ring, 17. upper limit ring, 18. lower limit ring, 19. liquid float, and 20. fixing column. DETAILED DESCRIPTION

[0016] In order to more clearly illustrate the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, without paying any creative work, other embodiments can be obtained based on these drawings and embodiments, which all fall within the scope of protection of the present invention.

[0017] according to Figure 1-2As shown, a liquid path system for sheath flow impedance counting includes a sheath flow tank 8, the liquid inlet of the sheath flow tank 8 is connected to the liquid storage tank 10 through a pipeline, the air outlet of the sheath flow tank 8 is connected to the air inlet of the air pump 1 through a pipeline, the air pump 1 provides negative pressure for the sheath flow tank 8, so that the sheath liquid in the liquid storage tank 10 enters the sheath flow tank 8 through the pipeline, the air outlet of the air pump 1 is connected to the air inlet of the positive pressure tank 4 through a pipeline, the air outlet of the positive pressure tank 4 is connected to the air inlet of the sheath flow tank 8 through a pipeline, the gas in the positive pressure tank 4 enters the sheath flow tank 8, and the sheath liquid in the sheath flow tank 8 is supplied to the sheath flow counting unit through the liquid outlet pipe 14.

[0018] In the above specific technical solution, the air pump 1 is started, the gas in the sheath flow tank 8 flows out, and a negative pressure is formed in the sheath flow tank 8, thereby sucking the sheath liquid in the liquid storage tank 10 into the sheath flow tank 8. After the liquid in the sheath flow tank 8 reaches a certain amount, the air pump 1 stops extracting air from the sheath flow tank 8 and starts blowing air into the positive pressure tank 4. When the pressure in the positive pressure tank 4 reaches a certain value, the air pump 1 stops working. When it is necessary to supply liquid to the sheath flow counting unit, the gas in the positive pressure tank 4 enters the sheath flow tank 8, and the sheath liquid in the sheath flow tank 8 is pressed into the sheath flow counting unit. Through the above technical solution, the sheath flow counting unit is accurately supplied with liquid, while the liquid path system of the sheath flow impedance counting is simplified, and the space occupied by it is effectively reduced.

[0019] A liquid float 19 is provided in the sheath flow tank 8 , and the liquid float 19 is sleeved on the outer wall of the fixed column 20 . The fixed column 20 is provided with an upper limit ring 17 and a lower limit ring 18 , and the liquid float 19 is located between the upper limit ring 17 and the lower limit ring 18 .

[0020] The sheath flow tank 8 includes an end cover 81 and a tank body 82. The fixing column 20 is fixedly installed at the bottom of the end cover 81. A sealing ring 16 is provided at the connection between the end cover 81 and the cover body. The sealing ring 16 ensures the sealing performance of the sheath flow tank 8.

[0021] The end cap 81 is fixedly connected to the bracket 15 to facilitate the installation of the sheath flow tank 8 .

[0022] A liquid valve 9 is provided on the pipeline between the liquid storage tank 10 and the sheath flow tank 8 , and a negative pressure air valve 12 is provided on the pipeline between the air pump 1 and the sheath flow tank 8 .

[0023] An input air valve 2 and a one-way valve 3 are provided on the pipeline between the air pump 1 and the positive pressure tank 4 , and an output air valve 7 is provided on the pipeline between the positive pressure tank 4 and the sheath flow tank 8 .

[0024] The positive pressure tank 4 is also connected to a pressure relief valve 5 and a pressure sensor 6 to facilitate adjustment of the air pressure in the positive pressure tank 4 , thereby accurately controlling the sheath fluid in the sheath flow tank 8 to be pressed into the sheath flow counting unit.

[0025] The sheath flow tank 8 is also connected to a liquid level sensor 11, which can detect sheath liquid overflow caused by failure of the liquid float 19 and send a signal to stop the air pump 1, which can effectively prevent the liquid from being sucked into the air pump 1 when the liquid float 19 fails.

[0026] The specific operating process of the present invention is as follows: First, the air pump 1 is started, the liquid valve 9 and the input air valve 2 are opened, and the air pump 1 draws air from the sheath flow tank 8, creating a negative pressure in the sheath flow tank 8, thereby drawing sheath liquid from the liquid storage tank 10 into the sheath flow tank 8. As the sheath liquid in the sheath flow tank 8 increases, the liquid float 19 contacts the upper limit ring 17 and reaches its highest position. At this time, the liquid valve 9 and the input air valve 2 are closed, and the air inlet of the air pump 1 is switched to the atmosphere via the negative pressure air valve 12. Then, the input air valve 2 is opened, and the air pump 1 supplies gas to the positive pressure tank 4, creating a positive pressure in the positive pressure tank 4. When the pressure sensor 66 senses that the pressure reaches +60 kPa, the input air valve 2 is closed, and the air pump 1 outlet is switched to the atmosphere via the input air valve 2. When the pressure in the positive pressure tank 4 reaches +60 kPa and the liquid float 19 reaches its highest position, the air pump 1 stops. When the sheath flow counting unit needs liquid supply, the output air valve 7 is opened, and the positive pressure tank 4 precisely controls the pressure to supply sheath liquid to the sheath flow counting unit through the liquid outlet pipe 14. Preferably, when the pressure sensor 6 detects that the pressure in the positive pressure tank 4 is greater than +60KPa, the pressure relief valve 5 opens to release the excess pressure and adjust the pressure in the positive pressure tank 4 to +60KPa. This fluid circuit system reduces the tank size while accurately supplying fluid to the sheath flow counting unit.

[0027] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A sheath flow impedance counting liquid circuit system, comprising a sheath flow tank (8), characterized in that: The liquid inlet of the sheath flow tank (8) is connected to the liquid storage tank (10) through a pipeline, the air outlet of the sheath flow tank (8) is connected to the air inlet of the air pump (1) through a pipeline, the air pump (1) provides negative pressure for the sheath flow tank (8), so that the sheath liquid in the liquid storage tank (10) enters the sheath flow tank (8) through the pipeline, the air outlet of the air pump (1) is connected to the air inlet of the positive pressure tank (4) through a pipeline, the air outlet of the positive pressure tank (4) is connected to the air inlet of the sheath flow tank (8) through a pipeline, the gas in the positive pressure tank (4) enters the sheath flow tank (8), and the sheath liquid in the sheath flow tank (8) is supplied to the sheath flow counting unit through the liquid outlet pipe (14).

2. A sheath flow impedance counting liquid path system according to claim 1, characterized in that: A liquid float (19) is provided in the sheath flow tank (8), and the liquid float (19) is sleeved on the outer wall of the fixed column (20). The fixed column (20) is provided with an upper limit ring (17) and a lower limit ring (18), and the liquid float (19) is located between the upper limit ring (17) and the lower limit ring (18).

3. The sheath flow impedance counting liquid path system according to claim 2, characterized in that: The sheath flow tank (8) comprises an end cover (81) and a tank body (82), the fixing column (20) is fixedly mounted on the bottom of the end cover (81), and a sealing ring (16) is provided at the connection between the end cover (81) and the cover body.

4. The sheath flow impedance counting liquid path system according to claim 3, characterized in that: The end cover (81) is fixedly connected to the bracket (15).

5. The sheath flow impedance counting liquid path system according to claim 1, characterized in that: A liquid valve (9) is provided on the pipeline between the liquid storage tank (10) and the sheath flow tank (8), and a negative pressure air valve (12) is provided on the pipeline between the air pump (1) and the sheath flow tank (8).

6. The sheath flow impedance counting liquid path system according to claim 1, characterized in that: An input air valve (2) and a one-way valve (3) are provided on the pipeline between the air pump (1) and the positive pressure tank (4), and an output air valve (7) is provided on the pipeline between the positive pressure tank (4) and the sheath flow tank (8).

7. The sheath flow impedance counting liquid path system according to claim 1, characterized in that: The positive pressure tank (4) is also connected to a pressure relief valve (5) and a pressure sensor (6).

8. The sheath flow impedance counting liquid circuit system according to claim 1, characterized in that: The sheath flow tank (8) is also connected to a liquid level sensor (11).

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