A quantitative liquid delivery device

Abstract

This utility model belongs to the field of liquid transportation technology, and specifically relates to a quantitative liquid transportation device. It includes a cavity, a driving fluid circulation mechanism, pneumatic valve I, pneumatic valve II, a storage bottle, a nozzle, and a pneumatic valve control module. The cavity is divided into a left cavity and a right cavity by a diaphragm. The left cavity is filled with a delivery fluid, and the right cavity is filled with a driving fluid. The right cavity is connected to the driving fluid circulation mechanism, which changes the volume of the right cavity by increasing or decreasing the amount of driving fluid, thus changing the volume of the left cavity accordingly. The nozzle is connected to the left cavity via an outlet pipe and pneumatic valve I, and is used to quantitatively deliver the delivery fluid. The storage bottle is connected to the left cavity via an inlet pipe and pneumatic valve II. Both pneumatic valves I and II are connected to the pneumatic valve control module, which controls the on / off state of pneumatic valves I and II. This utility model has a simple structure, small size, fast response, precise control, and good fatigue resistance.

Description

Technical Field

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

[0002] A pump is a fluid machine that transports or pressurizes liquids. It transfers mechanical energy from a prime mover or other external energy sources to the liquid, increasing its energy. Currently, positive displacement pumps are commonly used. Positive displacement pumps rely on the periodic change in the volume of a sealed working space containing the liquid, causing the liquid pressure to increase and forcibly discharge it. Therefore, positive displacement pumps not only have excellent self-priming characteristics but also maintain a stable flow rate even when the load changes. Positive displacement pumps are mainly divided into reciprocating pumps and rotary pumps. Existing positive displacement pumps use traditional mechanical structures, with multiple components used in their transmission and connection, making the pump body complex and difficult to disassemble and maintain. The use of multiple components in traditional positive displacement pump designs leads to significant frictional heat loss during rotation, reducing pump efficiency and accelerating aging, thus affecting service life. Existing precision liquid metering pumps often use a bellows-shaped expansion joint as the deformation body, which suffers from problems such as contraction lag, insufficient compression, and consequently, delayed response and poor control accuracy. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to provide a quantitative liquid delivery device to solve the issues of complex structure, delayed response, and poor control accuracy of existing volumetric pumps.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a quantitative liquid delivery device, including a cavity, a driving liquid circulation mechanism, a pneumatic valve I, a pneumatic valve II, a liquid storage bottle, a nozzle, and a pneumatic valve control module. The cavity is divided into a left cavity and a right cavity by a diaphragm. The left cavity and the right cavity are respectively filled with a delivery liquid and a driving liquid. The right cavity is connected to the driving liquid circulation mechanism. The driving liquid circulation mechanism changes the volume of the right cavity by increasing or decreasing the driving liquid, and thus the volume of the left cavity changes accordingly.

[0006] The nozzle is connected to the left cavity via the liquid outlet pipe and pneumatic valve I. The nozzle is used to complete the quantitative delivery of the liquid. The storage bottle is connected to the left cavity via the liquid inlet pipe and pneumatic valve II. Both pneumatic valve I and pneumatic valve II are connected to the pneumatic valve control module. The pneumatic valve control module is used to control the on / off state of pneumatic valve I and pneumatic valve II.

[0007] The pneumatic valve control module includes solenoid valve I and solenoid valve II. The first port of solenoid valve I is connected to pneumatic valve I through one air line, and the first port of solenoid valve II is connected to pneumatic valve II through another air line. The second ports of both solenoid valve I and solenoid valve II are connected to compressed air lines, and the third ports of both solenoid valve I and solenoid valve II are connected to vacuum lines.

[0008] The pneumatic valve I and the pneumatic valve II have the same structure, both including a valve body, an end cap and a diaphragm, wherein the end cap is provided on one side of the valve body and the diaphragm is located between the end cap and the valve body;

[0009] The valve body has two liquid passages, and the inner ports of both liquid passages are located within the envelope of the diaphragm. The end cap has a venting path corresponding to the diaphragm. The venting path connects or disconnects the two liquid passages by drawing a vacuum or introducing compressed air. The outer ends of the two liquid passages are the liquid outlet and the liquid inlet, respectively.

[0010] The diaphragm is a spherical membrane.

[0011] The driving fluid circulation drive mechanism includes a driving fluid pipeline, a hydraulic cylinder, and a linear drive module. The oil chamber of the hydraulic cylinder is connected to the right cavity through the driving fluid pipeline. The piston of the hydraulic cylinder is connected to the linear drive module, which is used to drive the piston to reciprocate linearly.

[0012] The linear drive module includes a housing, a lead screw, and a motor, wherein the lead screw and the motor are both mounted on the housing, and the output end of the motor is connected to the lead screw, and the lead screw is threadedly connected to the piston of the hydraulic cylinder.

[0013] The hydraulic cylinder has an oil chamber equipped with a pressure sensor. The pressure sensor provides feedback on the oil chamber pressure, thereby controlling the torque output of the motor to achieve constant pressure output. The motor is equipped with an encoder, which controls the motor speed output to achieve constant flow output.

[0014] The pneumatic valve I and the pneumatic valve II are integrated with the cavity into a single structure.

[0015] The advantages and beneficial effects of this utility model are as follows: The purpose of this utility model is to provide a quantitative liquid conveying device with a simple structure and smaller size; the spherical diaphragm reacts faster, the control is more precise, the fatigue resistance is better, and it is easier to process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the liquid extraction state of a quantitative liquid conveying device according to this utility model;

[0017] Figure 2This is a schematic diagram of the liquid dispensing state of a quantitative liquid conveying device according to the present invention;

[0018] Figure 3 This is a schematic diagram of the vacuum conduction state of the pneumatic valve in this utility model;

[0019] Figure 4 This is a schematic diagram of the compressed air conduction state of the pneumatic valve in this utility model.

[0020] In the diagram: 1. Liquid outlet line; 2. Pneumatic valve I; 3. Left chamber; 4. Diaphragm; 5. Right chamber; 6. Drive fluid line; 7. Hydraulic cylinder; 8. Lead screw; 9. Motor; 10. Pneumatic valve II; 11. Storage bottle; 12. Liquid inlet line; 13. Nozzle; 14. Solenoid valve I; 15. Solenoid valve II; 16. Pressure sensor; 201. Valve body; 202. Liquid outlet; 203. Liquid flow path; 204. End cap; 205. Air flow path; 206. Diaphragm. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] See Figures 1 to 2 As shown, this utility model provides a quantitative liquid delivery device, including a cavity, a driving liquid circulation mechanism, a pneumatic valve I2, a pneumatic valve II10, a storage bottle 11, a nozzle 13, and a pneumatic valve control module. The cavity is divided into a left cavity 3 and a right cavity 5 by a diaphragm 4. The left cavity 3 and the right cavity 5 are respectively filled with delivery liquid and driving liquid. The right cavity 5 is connected to the driving liquid circulation mechanism, which changes the volume of the right cavity 5 by increasing or decreasing the driving liquid, thereby changing the volume of the left cavity 3 accordingly. The nozzle 13 is connected to the left cavity 3 through an outlet pipe 1 and a pneumatic valve I2, and the nozzle 13 is used to complete the quantitative delivery of the delivery liquid. The storage bottle 11 is connected to the left cavity 3 through an inlet pipe 12 and a pneumatic valve II10. Both pneumatic valve I2 and pneumatic valve II10 are connected to the pneumatic valve control module, which is used to control the opening and closing of pneumatic valve I2 and pneumatic valve II10.

[0023] See Figure 1 As shown in the embodiment of this utility model, the pneumatic valve control module includes solenoid valve I14 and solenoid valve II15. The first interface of solenoid valve I14 is connected to pneumatic valve I2 through one air line, and the first interface of solenoid valve II15 is connected to pneumatic valve II10 through another air line. The second interfaces of solenoid valve I14 and solenoid valve II15 are both connected to compressed air lines, and the third interfaces of solenoid valve I14 and solenoid valve II15 are both connected to vacuum lines.

[0024] Preferably, the diaphragm 4 is a spherical membrane, which allows for faster reaction, more precise control, and better fatigue resistance.

[0025] See Figure 1 and Figure 2 As shown in the embodiment of this utility model, the driving fluid circulation driving mechanism includes a driving fluid pipeline 6, a hydraulic cylinder 7, and a linear drive module. The oil chamber of the hydraulic cylinder 7 is connected to the right cavity 5 through the driving fluid pipeline 6. The piston of the hydraulic cylinder 7 is connected to the linear drive module. The linear drive module is used to drive the piston to reciprocate linearly, thereby realizing the reciprocating motion of the driving fluid in the oil chamber of the hydraulic cylinder 7 and the right cavity 5.

[0026] In this embodiment, the linear drive module includes a housing, a lead screw 8, and a motor 9. Both the lead screw 8 and the motor 9 are mounted on the housing, and the output end of the motor 9 is connected to the lead screw 8. The lead screw 8 is threadedly connected to the piston of the hydraulic cylinder 7. The motor 9 drives the lead screw 8 to rotate, thereby causing the piston to move forward or backward. Specifically, the linear drive module can also employ any existing mechanism capable of linear drive.

[0027] Furthermore, the hydraulic cylinder 7 has a pressure sensor 16 in its oil chamber. The pressure sensor 16 provides feedback on the oil chamber pressure, thereby controlling the torque output of the motor 9 to achieve constant pressure output. The motor 9 is equipped with an encoder, which controls the speed output of the motor 9 to achieve constant flow output.

[0028] See Figure 3 and Figure 4 As shown in the embodiments of this utility model, pneumatic valve I2 and pneumatic valve II10 have the same structure, both including a valve body 201, an end cap 204, and a diaphragm 206. The end cap 204 is provided on one side of the valve body 201, and the diaphragm 206 is located between the end cap 204 and the valve body 201. The valve body 201 is provided with two liquid passages 203. The outer ends of the two liquid passages 203 are respectively the liquid outlet 202 and the liquid inlet. The inner ports of the two liquid passages 203 are both located within the envelope of the diaphragm 206. The end cap 204 is provided with an air passage 205 corresponding to the diaphragm 206. The air passage 205 realizes the function of the diaphragm 206 to connect or disconnect the two liquid passages 203 by drawing a vacuum or introducing compressed air. Specifically, when the ventilation path 205 is evacuated, the diaphragm 206 disengages from the inner ports of the two liquid passages 203 under negative pressure, thus connecting the inner ports of the two liquid passages 203; when compressed air is introduced into the ventilation path 205, the diaphragm 206 adheres tightly to the valve body 201, thereby closing the inner ports of the two liquid passages 203 and disconnecting the pneumatic valve I2 or the pneumatic valve II10.

[0029] In this embodiment, the working principle of pneumatic valve I2 and pneumatic valve II10 is as follows: a controlled pipeline is divided into two parts (two liquid passages 203) by a diaphragm 206. One side of the diaphragm 206 is connected to an external air source, and the other side is connected to the inlet and outlet of the controlled pipeline. When the air source side is compressed air, the diaphragm 206 squeezes and blocks the inlet and outlet of the controlled pipeline, and the valve is closed. When the air source side is a vacuum, the diaphragm 206 is sucked open, the inlet and outlet of the controlled pipeline are connected, and the valve is open. That is, by injecting compressed air or a vacuum into one side of the diaphragm 206, the valve is closed or opened.

[0030] See Figure 3 and Figure 4 As shown in the embodiment of this utility model, pneumatic valve I2 and pneumatic valve II10 are integrated with the cavity into a single structure, making the overall size of the device very small.

[0031] The working principle of the quantitative liquid delivery device provided by this utility model is as follows:

[0032] Motor 9 drives lead screw 8 to rotate, causing piston in hydraulic cylinder 7 to move forward or backward. When the piston moves forward, it pushes the driving fluid in the oil chamber through driving fluid pipeline 6 into right chamber 5. As the driving fluid in right chamber 5 increases, the pressure in right chamber 5 gradually increases, causing diaphragm 4 to deform towards left chamber 3, thereby pushing out the delivery fluid in left chamber 3. When the delivery fluid in left chamber 3 is pushed out, it enters nozzle 13 through outlet pipeline 1 and pneumatic valve I2, and the delivery fluid is metered out through nozzle 13.

[0033] When the piston of hydraulic cylinder 7 retracts, the driving fluid enters the oil chamber of hydraulic cylinder 7 from the right chamber 5 along the driving fluid line 6, causing a decrease in pressure inside the right chamber 5. The diaphragm 4 deforms towards the right chamber 5, thereby creating a negative pressure in the left chamber 3. The delivery fluid in the storage bottle 11 is then drawn into the left chamber 3 through the inlet line 12 and the pneumatic valve II 10. This process repeats, allowing the delivery fluid to flow from the storage bottle 11 into the outlet line 1 and then to the nozzle 13.

[0034] Specifically, when the left cavity 3 draws in the delivery liquid, pneumatic valve I2 closes and pneumatic valve II10 opens; when the left cavity 3 discharges liquid, pneumatic valve I2 opens and pneumatic valve II10 closes.

[0035] Specifically, when the liquid pumped by nozzle 13 is a liquid containing volatile organic solvents, there will be residue at the end of nozzle 13. After a long time, the solvent will evaporate and the solute will dry at the nozzle. Therefore, after the pumping of nozzle 13 is completed, pneumatic valve I2 is kept open and pneumatic valve II10 is closed. The piston of hydraulic cylinder 7 retracts and diaphragm 4 deforms to the right cavity 5. As a result, negative pressure is formed in the left cavity 3. The liquid remaining near the nozzle 13 due to surface tension is drawn back into the outlet pipe 1 and enters the left cavity 3, which can effectively prevent the solute from drying at nozzle 13.

[0036] The present invention provides a quantitative liquid delivery device with a compact structure. The outlet and inlet pneumatic control valves achieve valve closure and opening by injecting compressed air or vacuum into one side of the valve diaphragm. The pneumatic valve structure is very compact and can be integrated with the diaphragm pump chamber, making the overall size of the pump very small.

[0037] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A metering liquid delivery device, characterized by, It includes a cavity, a driving fluid circulation drive mechanism, pneumatic valve I (2), pneumatic valve II (10), a storage bottle (11), a nozzle (13), and a pneumatic valve control module. The cavity is divided into a left cavity (3) and a right cavity (5) by a diaphragm (4). The left cavity (3) and the right cavity (5) are respectively filled with delivery fluid and driving fluid. The right cavity (5) is connected to the driving fluid circulation drive mechanism. The driving fluid circulation drive mechanism changes the volume of the right cavity (5) by increasing or decreasing the driving fluid, and thus the volume of the left cavity (3) changes accordingly. The nozzle (13) is connected to the left cavity (3) through the liquid outlet pipe (1) and the pneumatic valve I (2). The nozzle (13) is used to complete the quantitative delivery of the liquid. The storage bottle (11) is connected to the left cavity (3) through the liquid inlet pipe (12) and the pneumatic valve II (10). Both the pneumatic valve I (2) and the pneumatic valve II (10) are connected to the pneumatic valve control module. The pneumatic valve control module is used to control the opening and closing of the pneumatic valve I (2) and the pneumatic valve II (10).

2. The metered liquid delivery device of claim 1, wherein, The pneumatic valve control module includes solenoid valve I (14) and solenoid valve II (15). The first port of solenoid valve I (14) is connected to pneumatic valve I (2) through an air pipeline. The first port of solenoid valve II (15) is connected to pneumatic valve II (10) through another air pipeline. The second ports of solenoid valve I (14) and solenoid valve II (15) are both connected to compressed air pipelines. The third ports of solenoid valve I (14) and solenoid valve II (15) are both connected to vacuum pipelines.

3. The metered liquid delivery device of claim 1, wherein, The pneumatic valve I (2) and the pneumatic valve II (10) have the same structure, both including a valve body (201), an end cap (204) and a diaphragm (206), wherein the end cap (204) is provided on one side of the valve body (201), and the diaphragm (206) is located between the end cap (204) and the valve body (201); The valve body (201) is provided with two liquid passages (203), and the inner ports of the two liquid passages (203) are located within the envelope of the diaphragm (206). The end cap (204) is provided with a ventilation path (205) corresponding to the diaphragm (206). The ventilation path (205) realizes the connection or disconnection of the two liquid passages (203) by drawing a vacuum or introducing compressed air. The outer ends of the two liquid passages (203) are the liquid outlet (202) and the liquid inlet, respectively.

4. The quantitative liquid delivery device according to claim 1, characterized in that, The diaphragm (4) is a spherical membrane.

5. The quantitative liquid delivery device according to claim 1, characterized in that, The driving fluid circulation drive mechanism includes a driving fluid pipeline (6), a hydraulic cylinder (7), and a linear drive module. The oil chamber of the hydraulic cylinder (7) is connected to the right cavity (5) through the driving fluid pipeline (6). The piston of the hydraulic cylinder (7) is connected to the linear drive module, which is used to drive the piston to reciprocate linearly.

6. The quantitative liquid delivery device according to claim 5, characterized in that, The linear drive module includes a housing, a lead screw (8), and a motor (9), wherein the lead screw (8) and the motor (9) are both mounted on the housing, and the output end of the motor (9) is connected to the lead screw (8), and the lead screw (8) is threadedly connected to the piston of the hydraulic cylinder (7).

7. The quantitative liquid delivery device according to claim 6, characterized in that, The hydraulic cylinder (7) has a pressure sensor (16) in its oil chamber. The pressure in the oil chamber is fed back by the pressure sensor (16), thereby controlling the torque output of the motor (9) to achieve constant pressure output. The motor (9) has an encoder, which controls the speed output of the motor (9) to achieve constant flow output.

8. The quantitative liquid delivery device according to claim 1, characterized in that, The pneumatic valve I (2) and the pneumatic valve II (10) are integrated with the cavity into a single structure.

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