Accurate metering liquid filling system

Abstract

The utility model discloses an accurate metering liquid filling system which comprises a liquid storage tank, a valve assembly, a metering assembly, a conveying pipeline, an exhaust pipeline and a filling pipeline, the output end of the liquid storage tank is connected with the input end of the valve assembly, and a first switch valve is arranged between the liquid storage tank and the valve assembly. The input end of the exhaust pipeline and the input end of the filling pipeline are respectively communicated with the output end of the valve assembly, a third switch valve is arranged on the exhaust pipeline, and a leakage-free electromagnetic valve is arranged on the filling pipeline; the valve assembly comprises a second switch valve, a first one-way valve and a second one-way valve. The metering assembly comprises a servo electric cylinder and a piston cylinder, the tail end of the servo electric cylinder is connected with one end of a piston rod of the piston cylinder, and one end of a cylinder barrel of the piston cylinder communicates with the conveying pipeline between the first one-way valve and the second one-way valve. The accurate metering liquid filling system solves the problems that in the prior art, the volume of filled liquid is not accurate, and deviation is large.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a precise metering liquid filling system. Background Art

[0002] The liquid filling system is a commonly used system for multi-fluid mixing conditions. In conventional scenarios, the requirements for the proportion of mixed filling raw materials are not high. However, for some saturated solutions of one liquid in another, when the proportion of this liquid is large and the amount of added liquid is extremely small, the requirements for the addition system will be very high. The conventional filling system uses a metering pump to supply liquid and a flow meter to accumulate and calculate the total filling capacity. Due to the dynamic deviation of the flow meter and the inertia of the metering pump during the stop process, it cannot stop rotating immediately, and thus cannot achieve accurate control of the total amount of liquid filling. Utility Model Content

[0003] In view of the above problems, the utility model provides a precise measurement liquid filling system to solve the problems of inaccurate liquid filling capacity and large deviation in the prior art.

[0004] The technical solution of the utility model is as follows:

[0005] A precise metering liquid filling system comprises a liquid storage tank, a valve assembly, a metering assembly, a delivery pipeline, an exhaust pipeline and a filling pipeline, wherein an air inlet is arranged on the top of the liquid storage tank, an output end of the liquid storage tank is connected to an input end of the valve assembly, a first switch valve is arranged between the liquid storage tank and the valve assembly, an input end of the exhaust pipeline and an input end of the filling pipeline are respectively connected to the output end of the valve assembly, a third switch valve is arranged on the exhaust pipeline, and a leak-free solenoid valve is arranged on the filling pipeline; the valve assembly comprises a second switch valve, a first check valve and a second check valve, the first check valve and the second check valve are sequentially connected in series through a delivery pipeline and then connected in parallel with the second switch valve; the metering assembly comprises a servo electric cylinder and a piston cylinder, the end of the servo electric cylinder is connected to one end of the piston rod of the piston cylinder, and one end of the cylinder barrel of the piston cylinder is connected to the delivery pipeline between the first check valve and the second check valve.

[0006] In a further technical solution, a safety relief valve is connected in parallel to the first one-way valve.

[0007] In a further technical solution, an air filter is provided at the air inlet of the liquid storage tank.

[0008] In a further technical solution, the liquid storage tank is arranged at the highest point in the system.

[0009] In a further technical solution, the third switch valve and the exhaust pipe output end are higher than the filling pipe output end.

[0010] In a further technical solution, there is no cavitation cavity in the delivery pipe between the piston cylinder and the filling pipe and in the filling pipe.

[0011] The beneficial effects of the utility model are:

[0012] 1. The leak-free solenoid valve can be closed, and the first switch valve, the second switch valve and the third switch valve can be opened. The liquid in the liquid storage tank can be introduced into the delivery pipeline and the exhaust pipeline, and the gas can be discharged from the output end of the exhaust pipeline. Then, the gas in the piston cylinder can be discharged by pushing the piston rod to the end of the piston cylinder. At this time, the second switch valve can be closed, and the piston rod can be retracted and retracted back and forth until the gas in the system flow channel is completely discharged. After the exhaust is completed, the third switch valve can be closed, and the servo electric cylinder can pull the piston rod back to one end of the piston rod to open the leak-free solenoid valve. The stroke of the servo electric cylinder can be accurately calculated according to the required volume to control the liquid volume at the output end of the filling pipeline. The exhaust of this system is convenient, and the servo electric cylinder is used to drive the piston rod to move, which is accurate in measurement and has high precision.

[0013] 2. Setting a safety relief valve can ensure the safety and stability of the system and ensure that the system pressure is within the allowable range;

[0014] 3. The air entering the liquid storage tank can be filtered by the air filter to prevent external impurities from directly entering the liquid storage tank and affecting the filling accuracy of the system;

[0015] 4. The positions of the liquid storage tank, the exhaust pipe output end and the third switch valve are arranged in a manner that is conducive to the system using the liquid's own weight to fill the delivery pipe, the exhaust pipe and the filling pipe, and to discharge the gas in the system;

[0016] 5. The cavitation-free chamber can avoid gas being hidden in the chamber during the liquid extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the flow of a precise metering liquid filling system described in an embodiment of the utility model.

[0018] Description of reference numerals:

[0019] 10. Liquid storage tank; 11. Air filter; 12. Liquid level window; 13. First switch valve; 20. Delivery pipeline; 31. First one-way valve; 32. Second one-way valve; 33. Second switch valve; 34. Safety overflow valve; 41. Servo electric cylinder; 42. Piston cylinder; 50. Exhaust pipeline; 51. Third switch valve; 60. Filling pipeline; 61. Leak-proof solenoid valve. DETAILED DESCRIPTION

[0020] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0021] Example:

[0022] like Figure 1 As shown, a precise metering liquid filling system comprises a liquid storage tank 10, a valve assembly, a metering assembly, a delivery pipeline 20, an exhaust pipeline 50 and a filling pipeline 60. An air inlet is arranged on the top of the liquid storage tank 10, and the output end of the liquid storage tank 10 is connected to the input end of the valve assembly. A first switch valve 13 is arranged between the liquid storage tank 10 and the valve assembly. The input end of the exhaust pipeline 50 and the input end of the filling pipeline 60 are respectively connected to the output end of the valve assembly. A third switch valve 51 is arranged on the exhaust pipeline 50, and a leak-free solenoid valve 61 is arranged on the filling pipeline 60; the valve assembly comprises a second switch valve 33, a first check valve 31 and a second check valve 32, and the first check valve 31 and the second check valve 32 are sequentially connected in series through the delivery pipeline 20 and then connected in parallel with the second switch valve 33; the metering assembly comprises a servo electric cylinder 41 and a piston cylinder 42, the end of the servo electric cylinder 41 is connected to one end of the piston rod of the piston cylinder 42, and one end of the cylinder barrel of the piston cylinder 42 is connected to the delivery pipeline 20 between the first check valve 31 and the second check valve 32.

[0023] In the system, the liquid storage tank 10 can be installed at the highest point of the entire system, and the output end of the third switch valve 51 and the exhaust pipe 50 is higher than the output end of the filling pipe 60. The positions of the liquid storage tank 10, the exhaust pipe output end and the third switch valve 51 are conducive to the system using the liquid's own weight to fill the delivery pipe 20, the exhaust pipe 50 and the filling pipe 60, and to discharge the gas in the system; there is no cavitation cavity in the delivery pipe 20 between the piston cylinder 42 and the filling pipe 60 and in the filling pipe 60, which can avoid the gas being hidden in the cavity during the liquid pumping process.

[0024] The working principle of the above technical solution is as follows:

[0025] Before filling, the gas in the system is first discharged to ensure the filling accuracy. The leak-proof solenoid valve 61 can be closed, and the first switch valve 13, the second switch valve 33 and the third switch valve 51 can be opened. The liquid storage tank 10 takes in air through the air inlet. The liquid's own weight can be used to pass the liquid in the liquid storage tank 10 into the delivery pipe 20 and the exhaust pipe 50, and the gas is discharged from the output end of the exhaust pipe 50. The servo electric cylinder 41 is started to push the piston rod to the end of the piston cylinder 42 to discharge the gas in the piston cylinder 42. At this time, the second switch valve 33 is closed, and the piston rod is retracted and retracted back and forth until there is no bubble discharged from the output end of the exhaust pipe 50, and the gas in the system flow channel is completely discharged. After the exhaust is completed, the third switch valve 51 is closed, and the servo electric cylinder 41 pulls the piston rod back to the end of the piston cylinder 42 close to the servo electric cylinder 41, and the leak-proof solenoid valve 61 can be opened. The stroke of the servo electric cylinder 41 can be accurately calculated according to the required volume to control the liquid filling volume at the output end of the filling pipe 60.

[0026] In another embodiment, if Figure 1As shown, the first one-way valve 31 is connected in parallel with a safety relief valve 34. Setting the safety relief valve 34 can ensure the safety and stability of the system and ensure that the system pressure is within the allowable range.

[0027] In another embodiment, if Figure 1 As shown, an air filter 11 is provided at the air inlet of the liquid storage tank 10. The air entering the liquid storage tank 10 can be filtered by the air filter 11 to prevent foreign impurities from directly entering the liquid storage tank 10 and affecting the filling accuracy of the system.

[0028] In another embodiment, if Figure 1 As shown, a transparent liquid level window 12 with scales may be provided on one side of the liquid storage tank 10 to facilitate observation of the liquid level of the liquid storage tank 10 .

[0029] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A precise metering liquid filling system, characterized in that: It includes a liquid storage tank, a valve assembly, a metering assembly, a delivery pipeline, an exhaust pipeline and a filling pipeline. An air inlet is provided on the top of the liquid storage tank. The output end of the liquid storage tank is connected to the input end of the valve assembly. A first switch valve is provided between the liquid storage tank and the valve assembly. The input end of the exhaust pipeline and the input end of the filling pipeline are respectively connected to the output end of the valve assembly. A third switch valve is provided on the exhaust pipeline, and a leak-free solenoid valve is provided on the filling pipeline. The valve assembly includes a second switch valve, a first check valve and a second check valve. The first check valve and the second check valve are connected in series in sequence through a delivery pipeline and then connected in parallel with the second switch valve. The metering assembly includes a servo electric cylinder and a piston cylinder. The end of the servo electric cylinder is connected to one end of the piston rod of the piston cylinder, and one end of the cylinder barrel of the piston cylinder is connected to the delivery pipeline between the first check valve and the second check valve.

2. A precise metering liquid filling system according to claim 1, characterized in that: The first one-way valve is connected in parallel with a safety relief valve.

3. The precise metering liquid filling system according to claim 1, characterized in that: An air filter is arranged at the air inlet of the liquid storage tank.

4. The precise metering liquid filling system according to claim 1, characterized in that: The liquid storage tank is arranged at the highest point in the system.

5. The precise measurement liquid filling system according to claim 4, characterized in that: The third switch valve and the exhaust pipe output end are higher than the filling pipe output end.

6. The precise measurement liquid filling system according to claim 1, characterized in that: There is no cavitation cavity in the delivery pipeline between the piston cylinder and the filling pipeline and in the filling pipeline.

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