Control method of double-branch liquid storage system

Abstract

The invention provides a control method of a double-branch liquid storage system, and the control method comprises the steps that a control unit controls a first regulating valve and a second regulating valve to be opened at the same time, and controls an infusion pump to operate, so that liquid is conveyed to a first storage tank and a second storage tank through a first branch pipeline and a second branch pipeline respectively; when the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or the liquid level of one of the first storage tank and the second storage tank reaches a set value firstly; the control unit calculates the valve opening degree adjusting proportion K according to the current liquid level value LA of the first storage tank, the current liquid level value LB of the second storage tank and the liquid level values LT of the first storage tank and the second storage tank in the full tank state, and adjusts the opening degree of the first adjusting valve and / or the second adjusting valve according to the valve opening degree adjusting proportion K. The control method can solve the problems that the first storage tank and the second storage tank cannot be full at the same time, and the first adjusting valve and the second adjusting valve cannot be opened and closed at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid storage systems, and more particularly to a control method for a dual-branch liquid storage system. Background Art

[0002] The technology of ship exhaust carbon dioxide capture is to separate and purify the carbon dioxide generated by the ship from the exhaust gas through physical or chemical technical means, then compress and liquefy the carbon dioxide for storage. After the ship docks, the liquid carbon dioxide is transferred to land for utilization or sequestration, so as to avoid the emission of carbon dioxide into the atmospheric environment and achieve ship decarbonization.

[0003] In order to improve the storage efficiency and storage capacity, a storage method with multiple storage tanks is generally adopted in the ship exhaust carbon dioxide capture system, that is, at least two storage tanks are provided in the system, and the compressed and liquefied carbon dioxide flows to each storage tank through different branch pipelines respectively to store liquid carbon dioxide in each storage tank simultaneously. Among them, regulating valves are provided on each branch pipeline. During the storage process, the opening degrees of the regulating valves are generally controlled to be the same so that each storage tank can reach the full tank state (i.e., be filled with liquid carbon dioxide at the same time), and thus the "same opening and closing" of each regulating valve is realized.

[0004] However, in the actual operation process, the problem that each storage tank cannot be full at the same time will occur, that is, when storing liquid carbon dioxide in two storage tanks of the same specification at the same time, when one storage tank has been stored, the other storage tank is not full yet, and the regulating valves cannot "open and close simultaneously". This not only wastes the time of inspection personnel, but also aggravates the coupling phenomenon of the infusion pipeline. The main reason for this situation is that after the regulating valve is continuously worn during long-term use, the accuracy of the regulating valve will decrease; when the control unit outputs the same current control signal to each regulating valve, the actual opening degrees of the regulating valves are different, resulting in different actual liquid storage speeds of each storage tank, and finally causing each storage tank not to be full at the same time, and the regulating valves cannot "open and close simultaneously". Summary of the Invention

[0005] The object of the present invention is to provide a control method for a dual-branch liquid storage system, which can solve the problems that the first storage tank and the second storage tank cannot be full at the same time, and the first regulating valve and the second regulating valve cannot "open and close simultaneously".

[0006] The present invention provides a control method for a dual-branch liquid storage system. The dual-branch liquid storage system includes an infusion pump for transporting liquid, a first storage tank, a second storage tank, and a control unit. The outlet of the infusion pump is connected to the first storage tank and the second storage tank through a first pipeline and a second pipeline respectively. A first liquid level sensor is provided on the first storage tank, and a second liquid level sensor is provided on the second storage tank. A first regulating valve is provided on the first pipeline, and a second regulating valve is provided on the second pipeline. The control unit is electrically connected to the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve, and the control end of the second regulating valve. Among them, the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves.

[0007] The control method includes:

[0008] The control unit controls the first regulating valve and the second regulating valve to open simultaneously, and controls the infusion pump to operate, so as to transport liquid to the first storage tank and the second storage tank through the first pipeline and the second pipeline respectively.

[0009] When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of one of the first storage tank and the second storage tank reaches the set value first, the control unit calculates the valve opening adjustment ratio K according to the current liquid level value L of the first storage tank A and the current liquid level value L of the second storage tank B and the liquid level value L of the first storage tank and the second storage tank in the full tank state T and adjusts the opening of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach the full tank state simultaneously, and the first regulating valve and the second regulating valve can be closed simultaneously.

[0010] Further, the valve opening adjustment ratio K is K A , and the control unit adjusts the opening of the first regulating valve according to the K A , and does not adjust the opening of the second regulating valve; the K A = (L T - L A ) / (L T - L B ) * (L B / L A ).

[0011] Further, the valve opening adjustment ratio K is K B , and the control unit adjusts the opening of the first regulating valve according to the K BAdjust the opening degree of the second regulating valve without adjusting the opening degree of the first regulating valve; the K B =(L T -L B ) / (L T -L A )*(L A / L B )

[0012] The present invention provides a control method for a dual-branch liquid storage system. The dual-branch liquid storage system includes an infusion pump for transporting liquid, a first storage tank, a second storage tank, and a control unit. The outlet of the infusion pump is respectively connected to the first storage tank and the second storage tank through a first pipeline and a second pipeline. A first liquid level sensor is provided on the first storage tank, and a second liquid level sensor is provided on the second storage tank. A first regulating valve and a first flow sensor are provided on the first pipeline, and the first flow sensor is located between the first regulating valve and the first storage tank. A second regulating valve and a second flow sensor are provided on the second pipeline, and the second flow sensor is located between the second regulating valve and the second storage tank. The control unit is electrically connected to the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve, the control end of the second regulating valve, the first flow sensor, and the second flow sensor by electrical signals. Among them, the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves;

[0013] The control method includes:

[0014] The control unit controls the first regulating valve and the second regulating valve to open simultaneously and controls the operation of the infusion pump to transport liquid to the first storage tank and the second storage tank through the first pipeline and the second pipeline respectively;

[0015] When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of either the first storage tank or the second storage tank reaches the set value first, the control unit calculates according to the current liquid level value L A of the first storage tank, the current liquid level value L B of the second storage tank, the liquid level value L T of the first storage tank and the second storage tank in the full-tank state, the current flow value Q A detected by the first flow sensor, and the current flow value Q BCalculate the valve opening adjustment ratio K, and adjust the opening degrees of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach the full-tank state simultaneously, and the first regulating valve and the second regulating valve can be closed simultaneously.

[0016] Further, the valve opening adjustment ratio K is K A , and the control unit adjusts the opening degree of the first regulating valve according to the K A , and does not adjust the opening degree of the second regulating valve; the K A = (L T - L A ) / (L T - L B ) * (Q B / Q A ).

[0017] Further, the valve opening adjustment ratio K is K B , and the control unit adjusts the opening degree of the second regulating valve according to the K B , and does not adjust the opening degree of the first regulating valve; the K B = (L T - L B ) / (L T - L A ) * (Q A / Q B ).

[0018] The present invention provides a control method for a dual-branch liquid storage system. The dual-branch liquid storage system includes an infusion pump for transporting liquid, a first storage tank, a second storage tank, and a control unit. The outlet of the infusion pump is connected to the first storage tank and the second storage tank through a first pipeline and a second pipeline respectively. A first liquid level sensor is provided on the first storage tank, a second liquid level sensor is provided on the second storage tank, a first regulating valve is provided on the first pipeline, and a second regulating valve is provided on the second pipeline; both the first regulating valve and the second regulating valve are regulating valves with valve position feedback functions. The first regulating valve has a first valve position feedback unit, and the second regulating valve has a second valve position feedback unit; the control unit is electrically connected to the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve, the control end of the second regulating valve, the first valve position feedback unit, and the second valve position feedback unit by electrical signals; wherein, the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves;

[0019] The control method includes:

[0020] The control unit controls the first regulating valve and the second regulating valve to open simultaneously, and controls the infusion pump to operate, so as to convey liquid to the first storage tank and the second storage tank through the first pipeline and the second pipeline respectively;

[0021] When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of either the first storage tank or the second storage tank reaches the set value first, the control unit calculates the valve opening adjustment ratio K according to the current liquid level value L of the first storage tank A , the current liquid level value L of the second storage tank B , the liquid level value L of the first storage tank and the second storage tank in the full tank state T , the valve position signal value I detected by the first valve position feedback unit A , the valve position signal value I detected by the second valve position feedback unit B , and adjusts the opening degrees of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach the full tank state simultaneously, and the first regulating valve and the second regulating valve can close simultaneously.

[0022] Further, the valve opening adjustment ratio K is K A , and the control unit adjusts the opening degree of the first regulating valve according to the K A , and does not adjust the opening degree of the second regulating valve; the K A =(L T -L A ) / (L T -L B )*(I B / I A ).

[0023] Further, the valve opening adjustment ratio K is K B , and the control unit adjusts the opening degree of the second regulating valve according to the K B , and does not adjust the opening degree of the first regulating valve; the K B =(L T -L B ) / (L T -L A )*(I A / I B ).

[0024] Further, the preset value is 0.5% - 10% of the total liquid level height of the first storage tank;

[0025] and / or, the set value is 30% - 70% of the total liquid level height of the first storage tank;

[0026] And / or, when the first storage tank and the second storage tank reach the full tank state, the liquid level height is 90% - 98% of their total liquid level height.

[0027] The control method of the dual-branch liquid storage system provided by the present invention sets a first liquid level sensor on the first storage tank and a second liquid level sensor on the second storage tank. When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of one of the first storage tank and the second storage tank reaches a set value first, the control unit calculates the valve opening adjustment ratio and adjusts the opening of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio, so that the first storage tank and the second storage tank can reach the full tank state simultaneously, and the first regulating valve and the second regulating valve can be closed simultaneously, thereby solving the problem that the first storage tank and the second storage tank cannot be full simultaneously, and the first regulating valve and the second regulating valve cannot be "opened and closed simultaneously", thus saving the time of inspection personnel and improving the anti-interference ability of the liquid delivery pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the dual-branch liquid storage system in the first embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the dual-branch liquid storage system in the second embodiment of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the dual-branch liquid storage system in the third embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0032] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention are used to distinguish similar objects and do not have to be used to describe a specific order or sequence.

[0033] The orientation terms such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the present invention are defined based on the positions of the structures in the drawings and the positions relative to each other, only for the sake of clarity and convenience of expressing the technical solution. It should be understood that the use of orientation terms should not limit the scope of protection requested by the present application.

[0034] First Embodiment

[0035] As Figure 1As shown in the figure, an embodiment of the present invention provides a control method for a dual-branch liquid storage system. The dual-branch liquid storage system includes an infusion pump 1 for transporting liquid, a first storage tank 2, a second storage tank 3, and a control unit 9. The outlet of the infusion pump 1 is respectively connected to the first storage tank 2 and the second storage tank 3 through a first pipeline 11 and a second pipeline 12. A first liquid level sensor 21 is provided on the first storage tank 2, and the first liquid level sensor 21 is used to detect the liquid level height in the first storage tank 2; a second liquid level sensor 31 is provided on the second storage tank 3, and the second liquid level sensor 31 is used to detect the liquid level height in the second storage tank 3. A first regulating valve 4 is provided on the first pipeline 11, and the first regulating valve 4 is used to regulate the liquid flow rate in the first pipeline 11; a second regulating valve 5 is provided on the second pipeline 12, and the second regulating valve 5 is used to regulate the liquid flow rate in the second pipeline 12. The control unit 9 is electrically connected to the control ends of the infusion pump 1, the first liquid level sensor 21, the second liquid level sensor 31, the first regulating valve 4, and the second regulating valve 5 respectively. The control unit 9 is used to control the opening and closing of the infusion pump 1 and adjust the opening degrees of the first regulating valve 4 and the second regulating valve 5. In this embodiment, the dual-branch liquid storage system is used for a ship exhaust gas carbon dioxide capture system. The inlet of the infusion pump 1 is used to connect to a carbon dioxide capture unit (not shown in the figure), that is, the infusion pump 1 is used to transport liquid carbon dioxide (that is, the above-mentioned liquid is liquid carbon dioxide). Of course, in other embodiments, the dual-branch liquid storage system can also be used to store other liquids.

[0036] Among them, the first storage tank 2 and the second storage tank 3 are the same storage tanks, that is, the parameters such as the capacity, size, and shape of the first storage tank 2 and the second storage tank 3 are the same, and the first storage tank 2 and the second storage tank 3 are generally containers with a constant cross-sectional area in each part; the first regulating valve 4 and the second regulating valve 5 are the same regulating valves, that is, the parameters such as the valve type and specification size of the first regulating valve 4 and the second regulating valve 5 are the same. The first pipeline 11 and the second pipeline 12 are pipelines with the same pipe diameter. The first regulating valve 4 and the second regulating valve 5 include, but are not limited to, electric regulating valves, etc. The control unit 9 can specifically be a PLC controller, etc.

[0037] The control method includes:

[0038] The control unit 9 controls the first regulating valve 4 and the second regulating valve 5 to open simultaneously, and the control unit 9 respectively outputs the same working control current I (the magnitude of I is generally 4 mA to 20 mA) to the control ends of the first regulating valve 4 and the second regulating valve 5, and controls the infusion pump 1 to operate, so as to transport liquid to the first storage tank 2 and the second storage tank 3 through the first pipeline 11 and the second pipeline 12 respectively;

[0039] When the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches a preset value, or when the liquid level of either the first storage tank 2 or the second storage tank 3 reaches the set value first (the other one does not reach the set value simultaneously, that is, the liquid level value of the other one is less than the set value), the control unit 9 calculates the valve opening adjustment ratio K based on the current liquid level value L of the first storage tank 2 A , the current liquid level value L of the second storage tank 3 B , the liquid level value L of the first storage tank 2 and the second storage tank 3 in the full tank state T (the liquid levels of the first storage tank 2 and the second storage tank 3 are the same in the full tank state, that is, the preset full tank liquid levels of both are L T ) and adjusts the opening degrees of the first regulating valve 4 and / or the second regulating valve 5 according to the valve opening adjustment ratio K, so that the first storage tank 2 and the second storage tank 3 can reach the full tank state simultaneously and the first regulating valve 4 and the second regulating valve 5 can be closed simultaneously.

[0040] Among them, since the liquid level heights in the first storage tank 2 and the second storage tank 3 are relatively low when the system starts working or the working time is short, it is impossible to accurately judge the liquid level difference between the two, and thus it is also impossible to accurately judge whether there is a difference in the actual opening degrees of the first regulating valve 4 and the second regulating valve 5. After the system works for a period of time, the liquid levels in the first storage tank 2 and the second storage tank 3 reach a certain height. If there is a difference in the actual opening degrees of the first regulating valve 4 and the second regulating valve 5, with the accumulation of the liquid storage speed difference between the first storage tank 2 and the second storage tank 3, there will also be a relatively obvious difference in the liquid levels of the first storage tank 2 and the second storage tank 3. At this time, the control unit 9 can perform the subsequent valve opening adjustment operation by taking the condition that the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches the preset value or the liquid level of either the first storage tank 2 or the second storage tank 3 reaches the set value first as the trigger condition. In actual application, the two judgment conditions of "the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches the preset value" and "the liquid level of either the first storage tank 2 or the second storage tank 3 reaches the set value first" generally do not trigger simultaneously, but no matter which of the two judgment conditions triggers first, the control unit 9 will perform the subsequent valve opening adjustment operation.

[0041] As an implementation manner, the above preset value is 0.5% - 10% of the total liquid level height of the first storage tank 2 (i.e., the liquid level height when the first storage tank 2 is completely filled with liquid; the total liquid level height of the first storage tank 2 is the same as that of the second storage tank 3), or 1% - 5%. Among them, if the preset value is too small, due to the equipment accuracy problems of the first liquid level sensor 21 and the second liquid level sensor 31 themselves, it may be impossible to accurately judge the liquid level difference between the first storage tank 2 and the second storage tank 3 (since the readings of the liquid level sensors themselves may have small fluctuations, if the preset value is less than the reading fluctuation value, misjudgment will occur); and if the preset value is too large, it may cause the judgment condition that "the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches the preset value" to never be triggered (generally, even if there are differences in the opening degrees of the first regulating valve 4 and the second regulating valve 5, the differences are small, so that the liquid levels in the first storage tank 2 and the second storage tank 3 will not have too large differences).

[0042] As an implementation manner, the above set value is 30% - 70% of the total liquid level height of the first storage tank 2, specifically it can be 30%, 40%, 50%, 60%, 70%, etc. At the same time, the number of set values can be one, for example, 50%; the number of set values can also be multiple, and the multiple set values increase in sequence to improve the accuracy of judgment. For example, the number of set values is two, which are 40% and 70% respectively, that is, when the liquid level of either the first storage tank 2 or the second storage tank 3 reaches 40% and 70% first, the control unit 9 will perform a valve opening degree adjustment operation once to improve the accuracy of adjustment.

[0043] As an implementation manner, the liquid level height (i.e., L T ) when the first storage tank 2 and the second storage tank 3 reach the full tank state is 90% - 98% of their total liquid level height. According to relevant regulations, generally it cannot exceed 98%; that is, the liquid level height when the first storage tank 2 reaches the full tank state is 90% - 98% of its total liquid level height, the liquid level height when the second storage tank 3 reaches the full tank state is 90% - 98% of its total liquid level height, and the liquid level heights of both are the same.

[0044] As an implementation manner, the above valve opening degree adjustment ratio K is K A , when the control unit 9 performs the valve opening degree adjustment operation, the control unit 9 adjusts the opening degree of the first regulating valve 4 according to the K A , and does not adjust the opening degree of the second regulating valve 5; that is, K A is the opening degree adjustment ratio of the first regulating valve 4, K A =(L T -L A ) / (L T -L B )*(L B / L A )

[0045] Specifically, when the control unit 9 adjusts the opening degree of the first regulating valve 4 according to K A it specifically outputs a working control current I1 to the control end of the first regulating valve 4, and I1 = I * K A , thereby adjusting the opening degree of the first regulating valve 4 (the opening degree of the regulating valve is linearly and positively correlated with the working control current output by the control unit 9, that is, the greater the working control current output by the control unit 9, the greater the opening degree of the regulating valve in proportion); that is, after adjustment, the opening degree of the first regulating valve 4 is adjusted from the original X1 to X2, and X2 = X1 * K A . It should be noted that after adjustment, the opening degree of the first regulating valve 4 may be increased or decreased (specifically related to the coefficient K A ), but the opening degree of the first regulating valve 4 cannot be greater than 100% nor less than or equal to 0.

[0046] The following is the reasoning for the calculation logic of K A :

[0047] When at least one of the above two judgment conditions is triggered, the current liquid level value of the first storage tank 2 is L A , the current liquid level value of the second storage tank 3 is L B , and the preset liquid level values of the first storage tank 2 and the second storage tank 3 in the full tank state are both L T .

[0048] The remaining capacity of the first storage tank 2 to reach the full tank state is L1, and L1 = S1 * (L T - L A ); where S1 is the cross-sectional area of the first storage tank 2, and L T - L A is the remaining liquid level height of the first storage tank 2 to reach the full tank state;

[0049] The remaining capacity of the second storage tank 3 to reach the full tank state is L2, and L2 = S2 * (L T - L B ); where S2 is the cross-sectional area of the second storage tank 3, and L T - L B is the remaining liquid level height of the second storage tank 3 to reach the full tank state; since the first storage tank 2 and the second storage tank 3 are the same storage tanks, S1 = S2;

[0050] The flow rate corresponding to the current opening degree of the first regulating valve 4 is Q1, and Q1 = L A * S1 / T; where T is the working duration of the system (that is, the opening duration of the first regulating valve 4);

[0051] The flow rate corresponding to the current opening degree of the second regulating valve 5 is Q2, and Q2 = L B*S2 / T;

[0052] Since only the opening degree of the first regulating valve 4 is adjusted and the opening degree of the second regulating valve 5 is not adjusted, the remaining opening time t2 of the second regulating valve 5 remains unchanged, and t2 = L2 / Q2 = S2*(L T -L B ) / (L B *S2 / T) = (L T -L B )*T / L B ;

[0053] In order to enable the first regulating valve 4 and the second regulating valve 5 to close simultaneously, the remaining opening time t1 of the first regulating valve 4 = t2. Therefore, after adjusting the opening degree of the first regulating valve 4, the flow rate corresponding to the first regulating valve 4 is Q3, and Q3 = L1 / t1 = L1 / t2 = S1*(L T -L A ) / [(L T -L B )*T / L B = S1*(L T -L A )*L B / [(L T -L B )*T];

[0054] Since the adjustment of the opening degree of the first regulating valve 4 is also the adjustment of the flow rate, therefore, K A = Q3 / Q1 = S1*(L T -L A )*L B / [(L T -L B )*T] / (L A *S1 / T) = (L T -L A ) / (L T -L B )*(L B / L A ).

[0055] As another implementation manner, the above valve opening degree adjustment ratio K is K B , when the control unit 9 executes the valve opening degree adjustment operation, the control unit 9 adjusts the opening degree of the second regulating valve 5 according to the K B , and does not adjust the opening degree of the first regulating valve 4; that is, K B is the opening degree adjustment ratio of the second regulating valve 5, and K B = (L T -L B ) / (L T -L A )*(LA / L B )。

[0056] Specifically, when the control unit 9 adjusts the opening degree of the second regulating valve 5 according to K B , it specifically outputs a working control current I2 to the control end of the second regulating valve 5, and I2 = I * K B , thereby adjusting the opening degree of the second regulating valve 5; that is, after adjustment, the opening degree of the second regulating valve 5 is adjusted from the original X3 to X4, and X4 = X3 * K B . It should be noted that after adjustment, the opening degree of the second regulating valve 5 may be increased or decreased (specifically related to the coefficient K B ), but the opening degree of the second regulating valve 5 cannot be greater than 100%, nor can it be less than or equal to 0. The calculation logic of K B is similar to the above calculation logic of K A , and will not be elaborated here.

[0057] Of course, in other embodiments, when the control unit 9 performs the valve opening degree adjustment operation, the control unit 9 can also adjust the opening degrees of the first regulating valve 4 and the second regulating valve 5 at the same time. For example, it can reduce the opening degree of the first regulating valve 4 and increase the opening degree of the second regulating valve 5 at the same time, or increase the opening degree of the first regulating valve 4 and reduce the opening degree of the second regulating valve 5 at the same time.

[0058] As an implementation manner, the control method further includes: when the first storage tank 2 and the second storage tank 3 reach the full tank state, the control unit 9 controls the infusion pump 1 to stop running, and controls the first regulating valve 4 and the second regulating valve 5 to close at the same time.

[0059] As Figure 1 shown, as an implementation manner, the outlet of the infusion pump 1 is respectively connected to the first branch pipeline 11 and the second branch pipeline 12 through the main pipeline 10, and a main valve 10 is provided on the main pipeline 10. The control unit 9 is also electrically connected to the control end of the main valve 10, and the control unit 9 can control the opening and closing of the main valve 10.

[0060] The control method of the dual-branch liquid storage system provided by the embodiment of the present invention is to set a first liquid level sensor 21 on the first storage tank 2 and a second liquid level sensor 31 on the second storage tank 3. When the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches a preset value, or when the liquid level of either the first storage tank 2 or the second storage tank 3 reaches the set value first, the control unit 9 calculates the valve opening adjustment ratio K and adjusts the opening of the first regulating valve 4 and / or the second regulating valve 5 according to the valve opening adjustment ratio K, so that the first storage tank 2 and the second storage tank 3 can reach the full-tank state simultaneously, and the first regulating valve 4 and the second regulating valve 5 can be closed simultaneously, thereby solving the problem that the first storage tank 2 and the second storage tank 3 cannot be full simultaneously, and the first regulating valve 4 and the second regulating valve 5 cannot be "opened and closed simultaneously", thus saving the time of inspection personnel and improving the anti-interference ability of the infusion pipeline.

[0061] Moreover, this control method only needs to calculate the valve opening adjustment ratio K by using the liquid level values detected by the first liquid level sensor 21 and the second liquid level sensor 31, without the need to additionally set other components, and there are no special requirements for the first regulating valve 4 and the second regulating valve 5. Therefore, the structure and control logic are relatively simple and the cost is low.

[0062] Second Embodiment

[0063] As Figure 2 shown, the control method of the dual-branch liquid storage system provided by the second embodiment of the present invention is basically the same as that of the first embodiment, the difference being the calculation principle of the valve opening adjustment ratio and the related detection components.

[0064] Specifically, in this embodiment, the dual-branch liquid storage system includes an infusion pump 1 for transporting liquid, a first storage tank 2, a second storage tank 3, and a control unit 9. The outlet of the infusion pump 1 is connected to the first storage tank 2 and the second storage tank 3 through a first pipeline 11 and a second pipeline 12 respectively. A first liquid level sensor 21 is provided on the first storage tank 2, and the first liquid level sensor 21 is used to detect the liquid level height in the first storage tank 2; a second liquid level sensor 31 is provided on the second storage tank 3, and the second liquid level sensor 31 is used to detect the liquid level height in the second storage tank 3. A first regulating valve 4 and a first flow sensor 7 are provided on the first pipeline 11. The first flow sensor 7 is located between the first regulating valve 4 and the first storage tank 2 (that is, the first flow sensor 7 is arranged on the pipeline between the first regulating valve 4 and the first storage tank 2). The first regulating valve 4 is used to regulate the liquid flow in the first pipeline 11, and the first flow sensor 7 is used to detect the pipeline flow after the first regulating valve 4. A second regulating valve 5 and a second flow sensor 8 are provided on the second pipeline 12. The second flow sensor 8 is located between the second regulating valve 5 and the second storage tank 3 (that is, the second flow sensor 8 is arranged on the pipeline between the second regulating valve 5 and the second storage tank 3). The second regulating valve 5 is used to regulate the liquid flow in the second pipeline 12, and the second flow sensor 8 is used to detect the pipeline flow after the second regulating valve 5. The control unit 9 is electrically connected to the infusion pump 1, the first liquid level sensor 21, the second liquid level sensor 31, the control end of the first regulating valve 4, the control end of the second regulating valve 5, the first flow sensor 7, and the second flow sensor 8 by electrical signals. The control unit 9 is used to control the opening and closing of the infusion pump 1 and adjust the opening degrees of the first regulating valve 4 and the second regulating valve 5.

[0065] Among them, the first storage tank 2 and the second storage tank 3 are the same storage tanks, that is, the parameters such as the capacity, size, and shape of the first storage tank 2 and the second storage tank 3 are the same, and generally, the first storage tank 2 and the second storage tank 3 are containers with a constant cross-sectional area at each part; the first regulating valve 4 and the second regulating valve 5 are the same regulating valves, that is, the parameters such as the valve type and specification size of the first regulating valve 4 and the second regulating valve 5 are the same. The first pipeline 11 and the second pipeline 12 are pipelines with the same pipe diameter.

[0066] The control method includes:

[0067] The control unit 9 controls the first regulating valve 4 and the second regulating valve 5 to open simultaneously, and the control unit 9 respectively outputs the same working control current I (the magnitude of I is generally 4 mA to 20 mA) to the control ends of the first regulating valve 4 and the second regulating valve 5, and controls the infusion pump 1 to operate, so as to transport liquid to the first storage tank 2 and the second storage tank 3 through the first pipeline 11 and the second pipeline 12 respectively;

[0068] When the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches a preset value, or when the liquid level of one of the first storage tank 2 and the second storage tank 3 reaches the set value first (the other does not reach the set value simultaneously), the control unit 9 calculates the valve opening adjustment ratio K based on the current liquid level value L of the first storage tank 2 A , the current liquid level value L of the second storage tank 3 B , the liquid level value L of the first storage tank 2 and the second storage tank 3 in the full tank state T (the liquid levels of the first storage tank 2 and the second storage tank 3 are the same in the full tank state, that is, the preset full tank liquid levels of both are L T ), the current flow value Q detected by the first flow sensor 7 A , the current flow value Q detected by the second flow sensor 8 B and adjusts the opening degrees of the first regulating valve 4 and / or the second regulating valve 5 according to the valve opening adjustment ratio K, so that the first storage tank 2 and the second storage tank 3 can reach the full tank state simultaneously, and the first regulating valve 4 and the second regulating valve 5 can be closed simultaneously.

[0069] As an implementation manner, the above preset value is 0.5% - 10% of the total liquid level height of the first storage tank 2, or 1% - 5%. Among them, if the preset value is too small, due to the equipment accuracy problems of the first liquid level sensor 21 and the second liquid level sensor 31, it may be impossible to accurately judge the liquid level difference between the first storage tank 2 and the second storage tank 3 (since the readings of the liquid level sensors themselves may have small fluctuations, if the preset value is less than the reading fluctuation value, it will cause misjudgment); and if the preset value is too large, it may cause the judgment condition that "the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches the preset value" to never be triggered (generally, even if there are differences in the opening degrees of the first regulating valve 4 and the second regulating valve 5, the differences are small, so that the liquid levels between the first storage tank 2 and the second storage tank 3 will not have too large differences).

[0070] As an implementation manner, the above set value is 30% - 70% of the total liquid level height of the first storage tank 2, specifically, it can be 30%, 40%, 50%, 60%, 70%, etc. At the same time, the number of set values can be one, for example, 50%; the number of set values can also be multiple, and the multiple set values increase in sequence, so as to improve the accuracy of judgment. For example, the number of set values is two, which are 40% and 70% respectively, that is, when the liquid level of one of the first storage tank 2 and the second storage tank 3 reaches 40% and 70% first, the control unit 9 will perform a valve opening adjustment operation each time to improve the accuracy of adjustment.

[0071] As an implementation manner, the liquid level height when the first storage tank 2 and the second storage tank 3 reach the full tank state (that is, L T) is 90% - 98% of its total liquid level height. According to relevant regulations, it generally cannot exceed 98%. That is, when the first storage tank 2 reaches the full tank state, the liquid level height is 90% - 98% of its total liquid level height. When the second storage tank 3 reaches the full tank state, the liquid level height is 90% - 98% of its total liquid level height, and the liquid level heights of both are the same.

[0072] As an implementation manner, the above valve opening adjustment ratio K is K A , when the control unit 9 performs the valve opening adjustment operation, the control unit 9 adjusts the opening of the first regulating valve 4 according to the K A and does not adjust the opening of the second regulating valve 5. That is, K A is the opening adjustment ratio of the first regulating valve 4, and K A =(L T -L A ) / (L T -L B )*(Q B / Q A ).

[0073] Specifically, when the control unit 9 adjusts the opening of the first regulating valve 4 according to K A , it specifically outputs a working control current I1 to the control end of the first regulating valve 4, and I1 = I * K A , thereby adjusting the opening of the first regulating valve 4. That is, after adjustment, the opening of the first regulating valve 4 is adjusted from the original X1 to X2, and X2 = X1 * K A . It should be noted that after adjustment, the opening of the first regulating valve 4 may be increased or decreased (specifically related to the coefficient K A ), but the opening of the first regulating valve 4 cannot be greater than 100% or less than or equal to 0.

[0074] The following is the reasoning for the calculation logic of K A :

[0075] When at least one of the above two judgment conditions is triggered, the current liquid level value of the first storage tank 2 is L A , the current liquid level value of the second storage tank 3 is L B , and the preset liquid level values of the first storage tank 2 and the second storage tank 3 in the full tank state are both L T .

[0076] The remaining capacity of the first storage tank 2 to reach the full tank state is L1, and L1 = S1 * (L T -L A ); where S1 is the cross-sectional area of the first storage tank 2, and L T -L A is the remaining liquid level height of the first storage tank 2 to reach the full tank state;

[0077] The remaining capacity of the second storage tank 3 when it reaches the full tank state is L2, and L2 = S2 * (L T -L B ); where S2 is the cross-sectional area of the second storage tank 3, and L T -L B is the remaining liquid level height of the second storage tank 3 when it reaches the full tank state; since the first storage tank 2 and the second storage tank 3 are the same storage tanks, so S1 = S2;

[0078] The flow rate corresponding to the current opening of the first regulating valve 4 is Q A , and the flow rate corresponding to the current opening of the second regulating valve 5 is Q B (that is, the current flow rates of the first regulating valve 4 and the second regulating valve 5 are directly measured by the first flow sensor 7 and the second flow sensor 8 respectively);

[0079] Since only the opening of the first regulating valve 4 is adjusted and the opening of the second regulating valve 5 is not adjusted, the remaining opening duration t2 of the second regulating valve 5 remains unchanged, and t2 = L2 / Q B = S2 * (L T -L B ) / Q B ;

[0080] In order to make the first regulating valve 4 and the second regulating valve 5 close simultaneously, the remaining opening duration t1 of the first regulating valve 4 = t2. Therefore, after adjusting the opening of the first regulating valve 4, the flow rate corresponding to the first regulating valve 4 is Q T , Q T = L1 / t1 = L1 / t2 = S1 * (L T -L A ) / [S2 * (L T -L B ) / Q B = (L T -L A ) * Q B / (L T -L B );

[0081] Since the adjustment of the opening of the first regulating valve 4 is also the adjustment of the flow rate, therefore, K A = Q T / Q A = (L T -L A ) * Q B / (L T -L B ) / Q A = (L T -L A ) / (L T -LB )*(Q B / Q A )。

[0082] As another implementation, the above valve opening adjustment ratio K is K B , when the control unit 9 performs the valve opening adjustment operation, the control unit 9 adjusts the opening of the second regulating valve 5 according to the said K B , and does not adjust the opening of the first regulating valve 4; that is, K B is the opening adjustment ratio of the second regulating valve 5, K B =(L T -L B ) / (L T -L A )*(Q A / Q B )。

[0083] Specifically, when the control unit 9 adjusts the opening of the second regulating valve 5 according to K B , specifically, a working control current I2 is output to the control end of the second regulating valve 5, I2 = I * K B , thereby adjusting the opening of the second regulating valve 5; that is, after adjustment, the opening of the second regulating valve 5 is adjusted from the original X3 to X4, X4 = X3 * K B . It should be noted that after adjustment, the opening of the second regulating valve 5 may be increased or decreased (specifically related to the coefficient K B ), but the opening of the second regulating valve 5 cannot be greater than 100%, nor can it be less than or equal to 0. The calculation logic of K B is similar to the calculation logic of the above K A , and will not be elaborated here.

[0084] Of course, in other embodiments, when the control unit 9 performs the valve opening adjustment operation, the control unit 9 can also adjust the openings of the first regulating valve 4 and the second regulating valve 5 at the same time. For example, reduce the opening of the first regulating valve 4 and increase the opening of the second regulating valve 5 at the same time, or increase the opening of the first regulating valve 4 and reduce the opening of the second regulating valve 5 at the same time.

[0085] As an implementation, this control method further includes: when the first storage tank 2 and the second storage tank 3 reach the full tank state, the control unit 9 controls the infusion pump 1 to stop running, and controls the first regulating valve 4 and the second regulating valve 5 to close at the same time.

[0086] Such as Figure 1As shown, as an implementation manner, the outlet of the infusion pump 1 is respectively connected to the first branch pipeline 11 and the second branch pipeline 12 through the main pipeline 10, and a main valve 10 is provided on the main pipeline 10. The control unit 9 is also electrically connected to the control end of the main valve 10, and the control unit 9 can control the opening and closing of the main valve 10.

[0087] For the control method of the dual-branch liquid storage system provided in this embodiment, by setting the first flow sensor 7 and the second flow sensor 8 to directly detect the pipeline flow rate, when calculating the adjustment ratio of the valve opening, it is simpler in terms of control logic and calculation method compared with the first embodiment.

[0088] Other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be elaborated here.

[0089] Third Embodiment

[0090] As Figure 3 shown, the control method of the dual-branch liquid storage system provided in the third embodiment of the present invention is basically the same as that of the first embodiment, and the difference lies in the calculation principle of the valve opening adjustment ratio and the related detection components.

[0091] Specifically, in this embodiment, the dual-branch liquid storage system includes an infusion pump 1 for transporting liquid, a first storage tank 2, a second storage tank 3, and a control unit 9. The outlet of the infusion pump 1 is respectively connected to the first storage tank 2 and the second storage tank 3 through the first branch pipeline 11 and the second branch pipeline 12. A first liquid level sensor 21 is provided on the first storage tank 2, and the first liquid level sensor 21 is used to detect the liquid level height in the first storage tank 2; a second liquid level sensor 31 is provided on the second storage tank 3, and the second liquid level sensor 31 is used to detect the liquid level height in the second storage tank 3. A first regulating valve 4 is provided on the first branch pipeline 11, and the first regulating valve 4 is used to regulate the liquid flow rate in the first branch pipeline 11. A second regulating valve 5 is provided on the second branch pipeline 12, and the second regulating valve 5 is used to regulate the liquid flow rate in the second branch pipeline 12. Both the first regulating valve 4 and the second regulating valve 5 are regulating valves with valve position feedback functions. The first regulating valve 4 has a first valve position feedback unit 41, and the second regulating valve 5 has a second valve position feedback unit 51. The control unit 9 is electrically connected to the control end of the infusion pump 1, the first liquid level sensor 21, the second liquid level sensor 31, the first regulating valve 4, the second regulating valve 5, the first valve position feedback unit 41, and the second valve position feedback unit 51 respectively. The control unit 9 is used to control the opening and closing of the infusion pump 1 and adjust the opening degrees of the first regulating valve 4 and the second regulating valve 5.

[0092] Specifically, the valve position feedback principle of the regulating valve is to use a sensor to feedback the position of the valve. The sensor can measure the position of the valve (i.e., the actual opening degree of the valve), convert the position information into an electrical signal, and transmit the electrical signal to the control system. The control system adjusts the control parameters of the regulating valve according to the position information feedback by the sensor to achieve precise control of the opening degree of the regulating valve. The regulating valve with valve position feedback function (generally has two types: mechanical and electronic) is a mature product on the market. For its specific structure and working principle, reference can be made to the existing technology, which will not be elaborated here (for example, patents such as CN210372232U, CN208348642U, CN220668560U, etc. can be referred to). That is, in this embodiment, the first valve position feedback unit 41 can detect the actual opening degree of the first regulating valve 4 and feedback a signal value corresponding to the actual opening degree of the first regulating valve 4 to the control unit 9 (the feedback signal value is generally a current value, and the current value is linearly positively correlated with the actual opening degree of the regulating valve, that is, the larger the feedback current value, the larger the actual opening degree of the regulating valve); the second valve position feedback unit 51 can detect the actual opening degree of the second regulating valve 5 and feedback a signal value corresponding to the actual opening degree of the second regulating valve 5 to the control unit 9.

[0093] Among them, the first storage tank 2 and the second storage tank 3 are the same storage tanks, that is, the parameters such as the capacity, size, and shape of the first storage tank 2 and the second storage tank 3 are the same, and the first storage tank 2 and the second storage tank 3 are generally containers with a constant cross-sectional area in each part; the first regulating valve 4 and the second regulating valve 5 are the same regulating valves, that is, the parameters such as the valve type and specification size of the first regulating valve 4 and the second regulating valve 5 are the same. The first pipeline 11 and the second pipeline 12 are pipelines with the same pipe diameter.

[0094] The control method includes:

[0095] The control unit 9 controls the first regulating valve 4 and the second regulating valve 5 to open simultaneously, and the control unit 9 respectively outputs the same working control current I (the magnitude of I is generally 4 mA to 20 mA) to the control end of the first regulating valve 4 and the control end of the second regulating valve 5, and controls the infusion pump 1 to operate to respectively transport liquids to the first storage tank 2 and the second storage tank 3 through the first pipeline 11 and the second pipeline 12;

[0096] When the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches a preset value, or when the liquid level of one of the first storage tank 2 and the second storage tank 3 reaches the set value first (the other one does not reach the set value simultaneously), the control unit 9 determines according to the current liquid level value L of the first storage tank 2 A 、the current liquid level value L of the second storage tank 3 B 、the liquid level value L of the first storage tank 2 and the second storage tank 3 in the full tank state T(The liquid levels of the first storage tank 2 and the second storage tank 3 are the same in the full-tank state, that is, the preset full-tank liquid levels of both are L T ) The valve position signal value I detected by the first valve position feedback unit 41 A ) The valve position signal value I detected by the second valve position feedback unit 51 B (I A and I B are generally current values, and I A is linearly positively correlated with the actual opening of the first regulating valve 4, and I B is linearly positively correlated with the actual opening of the second regulating valve 5), calculate the valve opening adjustment ratio K, and adjust the opening of the first regulating valve 4 and / or the second regulating valve 5 according to the valve opening adjustment ratio K, so that the first storage tank 2 and the second storage tank 3 can reach the full-tank state simultaneously, and the first regulating valve 4 and the second regulating valve 5 can be closed simultaneously.

[0097] As an implementation manner, the above preset value is 0.5% - 10% of the total liquid level height of the first storage tank 2, or 1% - 5%. Among them, if the preset value is too small, due to the equipment accuracy problems of the first liquid level sensor 21 and the second liquid level sensor 31, it may be impossible to accurately judge the liquid level difference between the first storage tank 2 and the second storage tank 3 (since the readings of the liquid level sensors themselves may have small fluctuations, if the preset value is less than the reading fluctuation value, it will cause misjudgment); and if the preset value is too large, it may cause the judgment condition that "the liquid level difference between the first storage tank 2 and the second storage tank 3 reaches the preset value" to never be triggered (generally, even if there are differences in the openings of the first regulating valve 4 and the second regulating valve 5, the differences are small, so that the liquid levels between the first storage tank 2 and the second storage tank 3 will not have too large differences).

[0098] As an implementation manner, the above setting value is 30% - 70% of the total liquid level height of the first storage tank 2, specifically it can be 30%, 40%, 50%, 60%, 70%, etc. At the same time, the number of setting values can be one, for example, 50%; the number of setting values can also be multiple, and the multiple setting values increase in sequence, so as to improve the accuracy of judgment. For example, the number of setting values is two, which are 40% and 70% respectively, that is, when the liquid level of one of the first storage tank 2 and the second storage tank 3 reaches 40% and 70% first, the control unit 9 will perform a valve opening adjustment operation each time to improve the accuracy of adjustment.

[0099] As an implementation manner, the liquid level height when the first storage tank 2 and the second storage tank 3 reach the full-tank state (that is, L T) is 90% - 98% of its total liquid level height. According to relevant regulations, it generally cannot exceed 98%. That is, when the first storage tank 2 reaches the full tank state, the liquid level height is 90% - 98% of its total liquid level height. When the second storage tank 3 reaches the full tank state, the liquid level height is 90% - 98% of its total liquid level height, and the liquid level heights of both are the same.

[0100] As an implementation manner, the above valve opening adjustment ratio K is K A , when the control unit 9 performs the valve opening adjustment operation, the control unit 9 adjusts the opening of the first regulating valve 4 according to the K A , and does not adjust the opening of the second regulating valve 5. That is, K A is the opening adjustment ratio of the first regulating valve 4, K A =(L T -L A ) / (L T -L B )*(I B / I A ).

[0101] Specifically, when the control unit 9 adjusts the opening of the first regulating valve 4 according to K A , specifically, a working control current I1 is output to the control end of the first regulating valve 4, I1 = I * K A , so as to adjust the opening of the first regulating valve 4. That is, after adjustment, the opening of the first regulating valve 4 is adjusted from the original X1 to X2, X2 = X1 * K A . It should be noted that after adjustment, the opening of the first regulating valve 4 may be increased or decreased (specifically related to the coefficient K A ), but the opening of the first regulating valve 4 cannot be greater than 100% or less than or equal to 0.

[0102] The following is the reasoning for the calculation logic of K A :

[0103] When at least one of the above two judgment conditions is triggered, the current liquid level value of the first storage tank 2 is L A , the current liquid level value of the second storage tank 3 is L B , and the preset liquid level values of the first storage tank 2 and the second storage tank 3 in the full tank state are both L T .

[0104] The remaining capacity of the first storage tank 2 to reach the full tank state is L1, L1 = S1 * (L T -L A ); where S1 is the cross-sectional area of the first storage tank 2, and L T -L A is the remaining liquid level height of the first storage tank 2 to reach the full tank state;

[0105] The remaining capacity of the second storage tank 3 when it reaches the full tank state is L2, and L2 = S2 * (L T -L B ); where S2 is the cross-sectional area of the second storage tank 3, and L T -L B is the remaining liquid level height of the second storage tank 3 when it reaches the full tank state; since the first storage tank 2 and the second storage tank 3 are the same storage tanks, S1 = S2;

[0106] The flow rate corresponding to the current opening of the first regulating valve 4 is Q1, and Q1 = n1 * I A ; where n1 is the relationship coefficient between the valve position signal and the flow rate of the first regulating valve 4 (since I A is linearly positively correlated with the actual opening of the first regulating valve 4, and the actual opening of the first regulating valve 4 is linearly positively correlated with the flow rate, so I A is linearly positively correlated with Q1);

[0107] Similarly, the flow rate corresponding to the current opening of the second regulating valve 5 is Q2, and Q2 = n2 * I B ; where n2 is the relationship coefficient between the valve position signal and the flow rate of the second regulating valve 5; since the first regulating valve 4 and the second regulating valve 5 are the same regulating valves, n1 = n2;

[0108] Since only the opening of the first regulating valve 4 is adjusted and the opening of the second regulating valve 5 is not adjusted, the remaining opening duration t2 of the second regulating valve 5 remains unchanged, and t2 = L2 / Q2 = S2 * (L T -L B ) / (n2 * I B );

[0109] In order to make the first regulating valve 4 and the second regulating valve 5 close simultaneously, the remaining opening duration t1 of the first regulating valve 4 = t2. Therefore, after adjusting the opening of the first regulating valve 4, the flow rate corresponding to the first regulating valve 4 is Q3, and Q3 = L1 / t1 = L1 / t2 = S1 * (L T -L A ) / [S2 * (L T -L B ) / (n2 * I B )] = (L T -L A ) * n2 * I B / (L T -L B );

[0110] Since the adjustment of the opening of the first regulating valve 4 is also the adjustment of the flow rate, therefore, K A = Q3 / Q1 = (L T -L A) * n2 * I B / (L T - L B ) / (n1 * I A ) = (L T - L A ) / (L T - L B ) * (I B / I A )。

[0111] As another implementation manner, the above valve opening adjustment ratio K is K B , when the control unit 9 performs the valve opening adjustment operation, the control unit 9 adjusts the opening of the second regulating valve 5 according to the said K B , and does not adjust the opening of the first regulating valve 4; that is, K B is the opening adjustment ratio of the second regulating valve 5, K B = (L T - L B ) / (L T - L A ) * (I A / I B )。

[0112] Specifically, when the control unit 9 adjusts the opening of the second regulating valve 5 according to K B , specifically, a working control current I2 is output to the control end of the second regulating valve 5, I2 = I * K B , thereby adjusting the opening of the second regulating valve 5; that is, after adjustment, the opening of the second regulating valve 5 is adjusted from the original X3 to X4, X4 = X3 * K B . It should be noted that after adjustment, the opening of the second regulating valve 5 may be increased or decreased (specifically related to the coefficient K B ), but the opening of the second regulating valve 5 cannot be greater than 100%, nor can it be less than or equal to 0. The calculation logic of K B is similar to the calculation logic of the above K A , and will not be elaborated here.

[0113] Of course, in other embodiments, when the control unit 9 performs the valve opening adjustment operation, the control unit 9 can also adjust the openings of the first regulating valve 4 and the second regulating valve 5 at the same time. For example, reduce the opening of the first regulating valve 4 and increase the opening of the second regulating valve 5 at the same time, or increase the opening of the first regulating valve 4 and reduce the opening of the second regulating valve 5 at the same time.

[0114] As one implementation manner, this control method further includes: when the first storage tank 2 and the second storage tank 3 reach the full tank state, the control unit 9 controls the infusion pump 1 to stop running, and controls the first regulating valve 4 and the second regulating valve 5 to close at the same time.

[0115] As Figure 1 shown, as an implementation manner, the outlet of the infusion pump 1 is respectively connected to the first branch pipeline 11 and the second branch pipeline 12 through the main pipeline 10, and a main valve 10 is provided on the main pipeline 10. The control unit 9 is also electrically connected to the control end of the main valve 10, and the control unit 9 can control the opening and closing of the main valve 10.

[0116] For the control method of the dual-branch liquid storage system provided in this embodiment, both the first regulating valve 4 and the second regulating valve 5 adopt regulating valves with valve position feedback functions, which can directly reflect the actual opening degree of the valves. When calculating the regulating valve opening degree adjustment ratio, it is simpler in terms of control logic and calculation method compared with the first embodiment, but there are certain requirements for the types of regulating valves.

[0117] Other structures and working principles of this embodiment are the same as or similar to those of the first embodiment, and will not be elaborated here.

[0118] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A control method for a dual-branch liquid storage system, characterized in that: The dual-branch liquid storage system comprises an infusion pump for conveying liquid, a first storage tank, a second storage tank and a control unit, the outlet of the infusion pump is connected to the first storage tank and the second storage tank through a first branch pipeline and a second branch pipeline respectively, the first storage tank is provided with a first liquid level sensor, the second storage tank is provided with a second liquid level sensor, the first branch pipeline is provided with a first regulating valve, and the second branch pipeline is provided with a second regulating valve; the control unit is respectively connected with the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve and the control end of the second regulating valve by electrical signals; wherein the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves; The control method comprises: The control unit controls the first regulating valve and the second regulating valve to open simultaneously, and controls the infusion pump to operate, so as to transport liquid to the first storage tank and the second storage tank through the first branch pipeline and the second branch pipeline respectively; When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of one of the first storage tank and the second storage tank reaches a set value first, the control unit adjusts the liquid level according to the current liquid level value L of the first storage tank. A , the current liquid level value L of the second storage tank B , the liquid level value L of the first storage tank and the second storage tank in the full tank state T Calculate the valve opening adjustment ratio K, and adjust the opening of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach a full tank state at the same time, and the first regulating valve and the second regulating valve can be closed at the same time.

2. The control method of the dual-branch liquid storage system according to claim 1, characterized in that: The valve opening adjustment ratio K is K A The control unit is based on the K A The opening of the first regulating valve is adjusted, and the opening of the second regulating valve is not adjusted; the K A =(L T -L A ) / (L T -L B )*(L B / L A ).

3. The control method of the dual-branch liquid storage system according to claim 1, characterized in that: The valve opening adjustment ratio K is K B The control unit is based on the K B The opening of the second regulating valve is adjusted, and the opening of the first regulating valve is not adjusted; the K B =(L T -L B ) / (L T -L A )*(L A / L B ).

4. A control method for a dual-branch liquid storage system, characterized in that: The dual-branch liquid storage system comprises an infusion pump for conveying liquid, a first storage tank, a second storage tank and a control unit, the outlet of the infusion pump is connected to the first storage tank and the second storage tank through a first branch pipeline and a second branch pipeline respectively, the first storage tank is provided with a first liquid level sensor, the second storage tank is provided with a second liquid level sensor, the first branch pipeline is provided with a first regulating valve and a first flow sensor, the first flow sensor is located between the first regulating valve and the first storage tank, the second branch pipeline is provided with a second regulating valve and a second flow sensor, and the second flow sensor is located between the second regulating valve and the second storage tank; the control unit is respectively connected to the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve, the control end of the second regulating valve, the first flow sensor and the second flow sensor with electrical signals; wherein, the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves; The control method comprises: The control unit controls the first regulating valve and the second regulating valve to open simultaneously, and controls the infusion pump to operate, so as to transport liquid to the first storage tank and the second storage tank through the first branch pipeline and the second branch pipeline respectively; When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of one of the first storage tank and the second storage tank reaches a set value first, the control unit adjusts the liquid level according to the current liquid level value L of the first storage tank. A , the current liquid level value L of the second storage tank B , the liquid level value L of the first storage tank and the second storage tank in the full tank state T , the current flow value Q detected by the first flow sensor A , the current flow value Q detected by the second flow sensor B Calculate the valve opening adjustment ratio K, and adjust the opening of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach a full tank state at the same time, and the first regulating valve and the second regulating valve can be closed at the same time.

5. The control method of the dual-branch liquid storage system according to claim 4, characterized in that: The valve opening adjustment ratio K is K A The control unit is based on the K A The opening of the first regulating valve is adjusted, and the opening of the second regulating valve is not adjusted; the K A =(L T -L A ) / (L T -L B )*(Q B / Q A ).

6. The control method of the dual-branch liquid storage system according to claim 4, characterized in that: The valve opening adjustment ratio K is K B The control unit is based on the K B The opening of the second regulating valve is adjusted, and the opening of the first regulating valve is not adjusted; the K B =(L T -L B ) / (L T -L A )*(Q A / Q B ).

7. A control method for a dual-branch liquid storage system, characterized in that: The dual-branch liquid storage system comprises an infusion pump for conveying liquid, a first storage tank, a second storage tank and a control unit, the outlet of the infusion pump is connected to the first storage tank and the second storage tank through a first branch pipeline and a second branch pipeline respectively, the first storage tank is provided with a first liquid level sensor, the second storage tank is provided with a second liquid level sensor, the first branch pipeline is provided with a first regulating valve, and the second branch pipeline is provided with a second regulating valve; the first regulating valve and the second regulating valve are both regulating valves with valve position feedback function, the first regulating valve has a first valve position feedback unit, and the second regulating valve has a second valve position feedback unit; the control unit is respectively connected with the infusion pump, the first liquid level sensor, the second liquid level sensor, the control end of the first regulating valve, the control end of the second regulating valve, the first valve position feedback unit and the second valve position feedback unit by electrical signals; wherein, the first storage tank and the second storage tank are the same storage tanks, and the first regulating valve and the second regulating valve are the same regulating valves; The control method comprises: The control unit controls the first regulating valve and the second regulating valve to open simultaneously, and controls the infusion pump to operate, so as to transport liquid to the first storage tank and the second storage tank through the first branch pipeline and the second branch pipeline respectively; When the liquid level difference between the first storage tank and the second storage tank reaches a preset value, or when the liquid level of one of the first storage tank and the second storage tank reaches a set value first, the control unit adjusts the liquid level according to the current liquid level value L of the first storage tank. A , the current liquid level value L of the second storage tank B , the liquid level value L of the first storage tank and the second storage tank in the full tank state T , the valve position signal value I detected by the first valve position feedback unit A , the valve position signal value I detected by the second valve position feedback unit B Calculate the valve opening adjustment ratio K, and adjust the opening of the first regulating valve and / or the second regulating valve according to the valve opening adjustment ratio K, so that the first storage tank and the second storage tank can reach a full tank state at the same time, and the first regulating valve and the second regulating valve can be closed at the same time.

8. The control method of the dual-branch liquid storage system according to claim 7, characterized in that: The valve opening adjustment ratio K is K A The control unit is based on the K A The opening of the first regulating valve is adjusted, and the opening of the second regulating valve is not adjusted; the K A =(L T -L A ) / (L T -L B )*(I B / I A ).

9. The control method of the dual-branch liquid storage system according to claim 7, characterized in that: The valve opening adjustment ratio K is K B The control unit is based on the K B The opening of the second regulating valve is adjusted, and the opening of the first regulating valve is not adjusted; the K B =(L T -L B ) / (L T -L A )*(I A / I B ).

10. The control method of a dual-branch liquid storage system according to any one of claims 1 to 9, characterized in that: The preset value is 0.5% to 10% of the total liquid level height of the first storage tank; and / or, the set value is 30% to 70% of the total liquid level height of the first storage tank; And / or, the liquid level heights of the first storage tank and the second storage tank when they are full are 90% to 98% of their total liquid level heights.

Images