Liquid metering pump, electrolyte filling equipment and liquid filling method

Abstract

The present invention provides a liquid metering pump, an electrolyte filling device and a liquid filling method, relating to the technical field of liquid metering pumps. The liquid metering pump of the present invention comprises: a pump body, a plunger, a driving device and a liquid path control device. The electrolyte filling device of the present invention comprises a liquid metering pump. The liquid filling method of the present invention comprises: cutting off the liquid outlet path of the pump body and connecting the liquid inlet path of the pump body; controlling the driving device to drive the plunger to move a first preset distance; cutting off the liquid inlet path of the pump body and connecting the liquid outlet path of the pump body; controlling the driving device to drive the plunger to move a second preset distance. The liquid metering pump, the electrolyte filling device and the liquid filling method of the present invention can solve the technical problems that it is difficult for the existing liquid metering pump to quickly and flexibly change the liquid injection amount according to production requirements, the adjustment time of the liquid injection amount is long, and there is a lot of material waste during the adjustment process.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid metering pumps, and specifically to a liquid metering pump, an electrolyte perfusion device, and a liquid perfusion method. Background Art

[0002] Many products require precise injection of some specific liquids during production. For example, in the production of lithium batteries and pharmaceutical metering perfusion, accurate injection of a specific amount of liquid is often required. In the prior art, an electric liquid injection pump is generally used to inject liquid. Although the accuracy is controllable, in some production processes, when the production requirements such as product models change, the injection volume of the injected liquid also needs to be changed accordingly. However, the electric liquid injection pump mostly uses a manual adjustment method to change the injection volume. Due to the high accuracy requirement for the liquid perfusion volume, it takes a long time for professionals to stabilize the metering, which is time-consuming and wasteful of materials. Summary of the Invention

[0003] In view of this, the present invention provides a liquid metering pump, an electrolyte perfusion device, and a liquid perfusion method to solve the technical problems that the liquid injection volume of the existing liquid metering pump is difficult to change quickly and accurately according to production requirements, the adjustment time of the liquid injection volume is long, and a large amount of materials are wasted during the adjustment process.

[0004] In a first aspect, the present invention provides a liquid metering pump, which includes:

[0005] A pump body for accommodating the liquid to be metered;

[0006] A plunger connected to the pump body in a manner that can move relative to the pump body along its axial direction;

[0007] A driving device for driving the plunger to move a preset distance relative to the pump body along its axial direction according to the volume of the liquid to be metered that needs to enter or exit the pump body. The driving device includes an output component for outputting a linear motion;

[0008] A transmission adjustment device that forms a transmission connection between the output component of the driving device and the plunger, and is used to adjust the relative position and / or angle between the output component of the driving device and the plunger during the process of the driving device driving the plunger to move along the axial direction of the pump body;

[0009] A liquid path control device for cutting off or connecting the liquid inlet path and the liquid outlet path of the pump body when the plunger moves relative to the pump body to change the volume of the accommodating space, so that the liquid to be metered enters or exits the liquid metering pump.

[0010] Preferably, the driving device further includes a motor and a ball screw. The motor is used to drive the ball screw to drive the plunger to perform a reciprocating linear motion relative to the pump body through the output component.

[0011] Preferably, the transmission correction device includes a first spherical plain bearing, a second spherical plain bearing and a connecting rod. The output component is formed with a first bearing mounting hole for mounting the first spherical plain bearing and a second bearing mounting hole for mounting the second spherical plain bearing. The first bearing mounting hole and the second bearing mounting hole are located on both sides of the radial direction of the plunger. The opposite ends of the connecting rod in the radial direction of the plunger are respectively connected to the first spherical plain bearing and the second spherical plain bearing, and the middle part of the connecting rod is connected to the plunger.

[0012] Preferably, the liquid metering pump includes multiple pairs of pump bodies and plungers arranged side by side in a direction perpendicular to the guiding direction of the guiding mechanism, as well as connecting rods, first spherical plain bearings and second spherical plain bearings corresponding to each plunger one by one. Each plunger is connected to its corresponding first spherical plain bearing and second spherical plain bearing through its corresponding connecting rod.

[0013] Preferably, the output component includes a driving connecting plate, a bottom plate, a top plate and an intermediate connecting plate. One end of the driving connecting plate is connected to the ball screw for transmission, and the opposite end is connected to the bottom plate. The bottom plate is connected to the moving part of the guiding mechanism. The first bearing mounting hole is formed on the bottom plate. The top plate is connected to the bottom plate through the intermediate connecting plate. The second bearing mounting hole is formed on the top plate. The bottom plate and the top plate are respectively located on both sides of the radial direction of the plunger.

[0014] Preferably, the liquid path control device includes a two-position three-way solenoid valve. When the liquid metering pump is in the liquid inlet state, the two-position three-way solenoid valve switches to a state where the liquid inlet passage of the liquid metering pump is opened and the liquid outlet passage of the liquid metering pump is closed at the same time. When the liquid metering pump is in the liquid outlet state, the two-position three-way solenoid valve switches to a state where the liquid inlet passage of the liquid metering pump is closed and the liquid outlet passage of the liquid metering pump is opened at the same time.

[0015] Preferably, the liquid path control device further includes a diversion block, which is rectangular. A connection hole communicating with the accommodation space is formed on the diversion block. One side of the diversion block abuts against the side of the two-position three-way solenoid valve where the valve port is formed. The diversion block includes a middle flow hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the connection hole. An inlet liquid hole and an outlet liquid hole are further formed on the diversion block. The diversion block includes an inlet liquid diversion hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the inlet liquid hole. The diversion block includes an outlet liquid diversion hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the outlet liquid hole. When the liquid metering pump intakes liquid, the middle flow hole communicates with the inlet liquid diversion hole through the two-position three-way solenoid valve. When the liquid metering pump discharges liquid, the middle flow hole communicates with the outlet liquid diversion hole through the two-position three-way solenoid valve.

[0016] Preferably, it further includes a detection device and a controller. The detection device is used to generate a trigger signal when detecting that the plunger moves to a predetermined position and send the trigger signal to the controller. The controller controls the driving device according to the received trigger signal to stop the plunger at the current position.

[0017] In a second aspect, the present invention provides an electrolyte perfusion device, and the electrolyte perfusion device includes the liquid metering pump described in the first aspect.

[0018] In a third aspect, the present invention provides a method for liquid perfusion using the liquid metering pump described in the first aspect, including the following steps:

[0019] The liquid path control device cuts off the liquid outlet path of the pump body and communicates the liquid inlet path of the pump body;

[0020] According to the specified amount of liquid entering the liquid metering pump, control the driving device to drive the plunger to move a first preset distance away from the pump body to suck a specified amount of liquid into the plunger pump;

[0021] The liquid path control device cuts off the liquid inlet path of the pump body and communicates the liquid outlet path of the pump body;

[0022] According to the specified amount of liquid output from the liquid metering pump, control the driving device to drive the plunger to move a second preset distance towards the pump body to discharge a specified amount of liquid from the plunger pump.

[0023] Beneficial effects: The liquid metering pump of the present invention, through a driving device, an electrolyte perfusion device, and a liquid perfusion method, can drive the plunger to move a preset distance relative to the pump body according to the amount of the perfusion liquid, and through a correction device, during the process of the driving device driving the plunger to move, adjust the relative position and / or angle between the output end of the driving device and the plunger, eliminate the transmission error caused by the force that is not parallel to the axial direction of the pump body during the transmission process, and enable the plunger to move synchronously along the axial direction of the pump body with the output component of the driving device, ensuring the accuracy of the plunger moving along the axial direction of the pump body. Since the amount of the liquid entering or discharging from the pump body is linearly related to the moving distance of the plunger, the amount of the perfusion liquid can be accurately controlled by precisely controlling the moving distance of the plunger. And when the production requirements change, resulting in a change in the liquid perfusion amount, only the moving distance of the plunger is required to achieve a precise change in the liquid perfusion amount, saving the manual adjustment process, saving the adjustment time, and avoiding material waste. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, and all of these are within the protection scope of the present invention.

[0025] Figure 1 It is a schematic structural diagram of the liquid metering pump according to Embodiment 1 of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the driving device according to Embodiment 2 of the present invention.

[0027] Figure 3 It is a schematic structural diagram of the transmission connection mechanism according to Embodiment 2 of the present invention.

[0028] Figure 4 It is a partial structural schematic diagram of the transmission connection mechanism according to Embodiment 2 of the present invention.

[0029] Figure 5 It is a schematic structural diagram of the liquid path control device according to Embodiment 4 of the present invention.

[0030] Figure 6 It is a flowchart of the liquid perfusion method according to Embodiment 7 of the present invention.

[0031] Parts and numbers in the figure: pump body 100, plunger 200, drive device 300, motor 310, ball screw 320, output component 330, first spherical plain bearing 331, second joint shaft 332, connecting rod 333, drive connecting plate 334, bottom plate 335, top plate 336, intermediate connecting plate 337, fixing part 341, moving part 342, liquid path control device 400, two-position three-way solenoid valve 410, flow guiding block 420, liquid inlet hole 421, liquid outlet hole 422, middle flow hole 423, liquid inlet guiding hole 424, liquid outlet guiding hole 425, photoelectric switch 500, induction detecting piece 600. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments may be combined with each other, and all are within the protection scope of the present invention.

[0033] Embodiment 1:

[0034] As Figure 1As shown, this embodiment provides a liquid metering pump, which drives the plunger 200 to move a preset distance relative to the pump body 100 according to the amount of the injected liquid through the driving device 300, and cooperates with the control action of the liquid circuit control device 400. When the plunger 200 moves a preset distance in a direction opposite to the direction of the pump body 100, the liquid circuit control device 400 cuts off the liquid outlet passage of the pump body 100 and connects the liquid inlet passage of the pump body 100 so that a specific amount of liquid to be measured enters the liquid metering pump, and when the plunger 200 moves a preset distance in the direction of the pump body 100, the liquid circuit device cuts off the liquid inlet passage of the pump body 100 and connects the liquid outlet passage of the pump body 100 so that a specific amount of liquid to be measured is discharged from the liquid metering pump. Since the amount of liquid entering or discharged from the pump body 100 is linearly related to the distance moved by the plunger 200, the amount of injected liquid can be accurately controlled by accurately controlling the moving distance of the plunger 200. When the production requirement changes and the liquid filling amount changes, the liquid filling amount can be accurately changed by only moving the plunger 200.

[0035] like Figure 1 and Figure 2 As shown, the liquid metering pump of this embodiment comprises:

[0036] A pump body 100 for containing a liquid to be metered;

[0037] A plunger 200 connected to the pump body 100 in a manner that it can move relative to the pump body 100 along its axial direction, one end of the plunger 200 and the inner wall of the pump body 100 form a receiving space for receiving the liquid to be measured, and the plunger 200 moves relative to the pump body 100 to change the volume of the receiving space;

[0038] The specific connection mode of the plunger 200 and the pump body 100 is that one end of the plunger 200 is connected to the driving device 300 in a transmission manner, and the other end is inserted into the pump body 100. The inner wall of the pump body 100 can be a hollow cylindrical shape. The end of the plunger 200 connected to the driving device 300 is exposed outside the pump body 100 to facilitate transmission, and the part of the end inserted into the pump body 100 close to the bottom of the pump body 100 is cylindrical, wherein the cylindrical outer surface of the plunger 200 cooperates with the inner wall of the pump body 100 to form a seal, and the plunger 200 reciprocates along the axial direction of the pump body 100. The end face of the end of the plunger 200 inserted into the pump body 100 that is closest to the bottom of the pump body 100 and the inner wall of the pump body 100 enclose a relatively closed space in the pump body 100, namely, a containing space, which is used to contain the liquid substance to be infused. When the plunger 200 moves back and forth, the volume of the space will also change accordingly. In order to ensure the accuracy of liquid injection and the durability of the product, the plunger 200 and the valve body are both made of ceramic materials with good dimensional stability and high chemical stability.

[0039] A driving device 300 for driving the plunger 200 to move a preset distance relative to the pump body 100 according to the volume of the liquid to be metered that needs to enter or be discharged from the pump body 100;

[0040] A driving device 300 for driving the plunger 200 to move a preset distance relative to the pump body 100 along its axial direction according to the volume of the liquid to be metered that needs to enter or be discharged from the pump body 100, the driving device 300 including an output component 330 for outputting a linear motion;

[0041] Wherein the driving device 300 can drive the plunger 200 to reciprocate relative to the pump body 100. In one case, the plunger 200 moves in a direction opposite to the direction of the pump body 100, that is, the plunger 200 moves away from the pump body 100, which means the plunger 200 moves backward. At this time, since the end face of the plunger 200 that forms the accommodating space with the pump body 100 is getting farther and farther away from the bottom of the pump body 100, the volume of the accommodating space becomes larger, creating a negative pressure inside the pump. Coupled with the action of the liquid path control device 400, the liquid outside the pump body 100 is sucked into the accommodating space under the action of the negative pressure. In another case, the plunger 200 moves in the direction of the pump body 100, that is, the plunger 200 moves closer to the pump body 100, which means the plunger 200 moves forward. Since the end face of the plunger 200 that forms the accommodating space with the pump body 100 is getting closer and closer to the bottom of the pump body 100, the volume of the accommodating space becomes smaller. Coupled with the action of the liquid path control device 400, the plunger 200 extrudes the liquid to be perfused out of the pump body 100 during the movement. Since the change amount of the volume of the accommodating space is linearly related to the moving distance of the plunger 200, the amount of the perfused liquid can be accurately controlled by precisely controlling the moving distance of the plunger 200. And when the production requirements change, resulting in a change in the liquid perfusion amount, only the moving distance of the plunger 200 is needed to achieve an accurate change in the liquid perfusion amount.

[0042] A transmission adjustment device that forms a transmission connection between the output component 330 of the driving device 300 and the plunger 200, and is used to adjust the relative position and / or angle between the output component 330 of the driving device 300 and the plunger during the process of the driving device 300 driving the plunger 200 to move along the axial direction of the pump body 100.

[0043] During the process of driving the plunger 200 to move by the driving device 300, due to installation errors or other reasons, the moving direction transmitted to the plunger 200 may not be parallel to the axial direction of the pump body 100. At this time, the direction of the driving force applied to the plunger 200 is also not parallel to the axial direction of the pump body 100, which easily causes structural deformation and thus affects the transmission accuracy. In response to this, a transmission adjustment device is provided in this embodiment. This device forms a transmission connection between the output component 330 of the driving device and the plunger 200, and adjusts the relative position and / or angle between the output component 330 of the driving device 300 and the plunger 200 during the process of the driving device 300 driving the plunger 200 to move along the axial direction of the pump body 100. At this time, if the moving direction output to the plunger 200 is not parallel to the axial direction of the pump body 100, the transmission adjustment device can enable the plunger 200 to automatically adjust its relative position and / or angle with respect to the output component 330 under the action of a force that is not parallel to the axial direction of the pump body 100, so that the direction of the motion output after being adjusted by the transmission adjustment device is consistent with the axial direction of the pump body 100, so that the plunger 200 can move synchronously with the driving device 300, thereby improving the moving accuracy of the plunger 200 and ultimately improving the accuracy of liquid perfusion.

[0044] A liquid path control device 400, which is used to cut off or connect the liquid inlet passage and the liquid outlet passage of the pump body 100 when the plunger 200 moves relative to the pump body 100 to change the volume of the accommodating space, so that the liquid to be metered enters or exits the liquid metering pump.

[0045] In a specific perfusion process, the control mode of the liquid path is as follows: when the plunger 200 moves in a direction opposite to the direction of the pump body 100 to increase the volume of the accommodating space, the liquid path control device 400 cuts off the liquid outlet passage of the pump body 100 and connects the liquid inlet passage of the pump body 100 so that the liquid to be metered enters the liquid metering pump; when the plunger 200 moves in the direction of the pump body 100 to decrease the volume of the accommodating space, the liquid path device cuts off the liquid inlet passage of the pump body 100 and connects the liquid outlet passage of the pump body 100 so that the liquid to be metered exits the liquid metering pump.

[0046] Embodiment 2

[0047] As Figures 2 to 4As shown, this embodiment is optimized based on Embodiment 1. The driving device 300 includes a motor 310, a ball screw 320, and an output component 330. The motor 310 is used to drive the ball screw 320 to drive the plunger 200 to make a reciprocating linear motion relative to the pump body 100 through the output component 330. During the working process, the motor 310 is connected to the ball screw by a coupling, and the nut in the ball screw is connected to the output component 330. The motor 310 drives the screw to rotate, the rotation of the screw drives the nut to make a reciprocating linear motion, the nut then drives the output component 330 to make a reciprocating linear motion, and finally the output component 330 drives the plunger 200 to make a reciprocating linear motion. Therefore, by controlling the rotation angle of the motor 310, the moving distance of the plunger 200 can be controlled. Since the ball screw 320 has precise transmission, the accuracy of the liquid filling volume can be effectively guaranteed.

[0048] In addition, in order to enable the plunger 200 to move accurately along a straight line, the liquid metering pump of this embodiment further includes a guiding mechanism. The guiding mechanism includes a fixed part 341 and a moving part 342. The moving part 342 can move relative to the fixed part 341 along the guiding direction of the fixed part 341, and the moving part 342 is connected to the output component 330. The guiding mechanism can adopt a guide rail slider, a guide groove slider, a guide rod and sleeve, etc. In this embodiment, the guiding mechanism preferably adopts a linear slide table and a slider used in cooperation with the linear slide table. The linear slide table serves as the fixed part 341 of the guiding mechanism, and the slider serves as the moving part of the guiding mechanism. The slider makes a linear motion under the constraint of the linear slide table, so as to drive the piston to make an accurate linear motion through the charging connection mechanism.

[0049] In this embodiment, the structure of the transmission correction device is as follows: it further includes a first spherical plain bearing 331 and a second spherical plain bearing 332. The output component 330 is formed with a first bearing mounting hole for mounting the first spherical plain bearing 331 and a second bearing mounting hole for mounting the second spherical plain bearing 332. The first bearing mounting hole and the second bearing mounting hole are located on both sides of the radial direction of the plunger 200. A connecting rod 333 is further connected to the plunger 200. The opposite ends of the connecting rod 333 along the radial direction of the plunger 200 are respectively connected to the first spherical plain bearing 331 and the second spherical plain bearing 332.

[0050] Among them, the spherical plain bearing consists of an outer ring and an inner ring. The outer ring of the bearing can be installed in the bearing mounting hole of the output component 330 in an interference fit manner. The end of the connecting rod 333 is inserted into the inner ring of the bearing and fixed to the inner ring. The inner ring of the bearing can rotate relative to the outer ring. In this embodiment, two spherical plain bearings are adopted, namely the first spherical plain bearing 331 and the second spherical plain bearing 332. And the installation positions of the two spherical plain bearings are on both sides of the plunger 200 in the radial direction, so that the connection line of the installation positions of the two spherical plain bearings is parallel to the radial direction of the plunger 200, that is, perpendicular to the moving direction (axial direction) of the plunger 200. In this way, when the output component 330 drives the plunger 200 to reciprocate along its axial direction, the connecting rod can flexibly rotate relative to the output component 330 through the first spherical plain bearing 331 and the second spherical plain bearing 332 to adjust the relative angle and position between the plunger 200 and the output component 330, so as to realize the automatic positioning of the plunger 200 during the transmission process, effectively ensuring the accuracy of the moving distance of the plunger 200. In order to ensure the reliability of the connection and the stability and accuracy of the transmission process, a through hole is formed at one end of the plunger 200 connected to the connecting rod. The plunger 200 passes through the through hole from one side in its radial direction and exits from the opposite side. That is, the middle part of the connecting rod is fixed in the through hole of the plunger 200, and the two ends are respectively connected to the first spherical plain bearing 331 and the second bearing.

[0051] As a preferred structure of the output component 330, the output component 330 includes a drive connection plate 334, a bottom plate 335, a top plate 336 and an intermediate connection plate 337. One end of the drive connection plate 334 is in transmission connection with the ball screw 320, and the opposite end is connected to the bottom plate 335. The bottom plate 335 is connected to the moving part 342 of the guiding mechanism. The first bearing mounting hole is formed on the bottom plate 335. The top plate 336 is connected to the bottom plate 335 through the intermediate connection plate 337. The second bearing mounting hole is formed on the top plate 336. The bottom plate 335 and the top are respectively on both sides of the plunger 200 in the radial direction. The bottom plate 335, the top plate 336 and the intermediate connection plate 337 form a "concave" shape with an opening facing the plunger 200. The two bearing mounting holes are respectively on the upper and lower sides of the plunger 200, so that the first spherical plain bearing 331 and the second bearing are also respectively on the upper and lower sides of the plunger 200. When the drive connection plate 334 drives the bottom plate 335 to move, the bottom plate 335 and the top plate 336 drive the plunger 200 to move linearly in the horizontal direction synchronously from the upper and lower positions. The plunger 200 uses the upper and lower spherical plain bearings to adjust the position and angle, so as to perform automatic positioning. In this way, while ensuring the stability of the transmission, the error of the transmission at the two positions is also eliminated, enabling the plunger 200 to accurately move a preset distance along its axial direction.

[0052] In addition, this embodiment further includes a mounting substrate, which is used to mount components such as the guiding mechanism and the pump body 100. The plunger 200 and the ball screw 320 are respectively located on the upper and lower sides of the mounting substrate. Two strip-shaped grooves are formed on the mounting substrate, and the driving connecting plate 334 extends from the screw towards the plunger 200 and passes through the strip-shaped grooves and then is connected to the bottom plate 335. When the plunger 200 moves along its axial direction, the driving connecting plate 334 can move in the strip-shaped grooves.

[0053] Embodiment 3

[0054] As Figure 1 shown, this embodiment is further optimized on the basis of Embodiment 2. In this embodiment, the liquid metering pump includes multiple pairs of pump bodies 100 and plungers 200 arranged side by side in a direction perpendicular to the guiding direction of the guiding mechanism, as well as connecting rods 333, first spherical plain bearings 331, and second spherical plain bearings 332 corresponding to each plunger 200 one by one. Each plunger 200 is connected to its corresponding connecting rod 333 through its corresponding first spherical plain bearing 331 and second spherical plain bearing 332.

[0055] In order to improve the liquid perfusion efficiency while ensuring the liquid perfusion accuracy, this embodiment adopts a scheme of using the same driving device 300 to drive multiple metering pumps, and each plunger 200 of the metering pump is equipped with a set of first spherical plain bearing 331 and second spherical plain bearing 332. In this way, during the movement of each plunger 200, automatic positioning can be achieved, so that when multiple plungers 200 are driven by the same driving device 300, the influence caused by the position error between them can be eliminated, thereby ensuring the accuracy of the moving distance of the plunger 200 while improving the perfusion efficiency.

[0056] Embodiment 4

[0057] As Figure 5 shown, this embodiment optimizes the liquid path control device 400. The liquid path control device 400 includes a two-position three-way solenoid valve 410. When the liquid metering pump is sucking liquid, the two-position three-way solenoid valve 410 switches to a state where the liquid inlet path of the liquid metering pump is opened and the liquid outlet path of the liquid metering pump is closed. When the liquid metering pump is discharging liquid, the two-position three-way solenoid valve 410 switches to a state where the liquid inlet path of the liquid metering pump is closed and the liquid outlet path of the liquid metering pump is opened. As a preferred example, the two-position three-way solenoid valve 410 can be an SMC chemical liquid two-position three-way solenoid valve 410. The two-position three-way solenoid valve 410 includes three valve ports, and the three valve ports are respectively communicated with the liquid inlet head, the liquid outlet head of the liquid metering pump, and the accommodation space inside the pump body 100. Through electromagnetic action, the communication relationship of the three valve ports can be quickly switched, so as to accurately cooperate with the moving direction of the plunger 200 to achieve liquid inlet and liquid outlet.

[0058] The liquid path control device 400 further includes a diversion block 420. The diversion block 420 is rectangular. A connection hole communicating with the accommodation space is formed on the diversion block 420. One surface of the diversion block 420 abuts against the surface of the two-position three-way solenoid valve 410 where the valve port is formed. The diversion block 420 includes a middle flow hole 423 formed by extending from the surface of the diversion block 420 that abuts against the two-position three-way solenoid valve 410 in a direction opposite to the two-position three-way solenoid valve 410 to a position communicating with the connection hole. An inlet liquid hole 421 and an outlet liquid hole 422 are further formed on the diversion block 420. The diversion block 420 includes an inlet liquid diversion hole 424 formed by extending from the surface of the diversion block 420 that abuts against the two-position three-way solenoid valve 410 in a direction opposite to the two-position three-way solenoid valve 410 to a position communicating with the inlet liquid hole 421. The diversion block 420 includes an outlet liquid diversion hole 425 formed by extending from the surface of the diversion block 420 that abuts against the two-position three-way solenoid valve 410 in a direction opposite to the two-position three-way solenoid valve 410 to a position communicating with the outlet liquid hole 422. When the liquid metering pump intakes liquid, the middle flow hole 423 is communicated with the inlet liquid diversion hole 424 through the two-position three-way solenoid valve 410. When the liquid metering pump discharges liquid, the middle flow hole 423 is communicated with the outlet liquid diversion hole 425 through the two-position three-way solenoid valve 410.

[0059] In this embodiment, the flow guiding block 420 has a rectangular structure. The valve port of the two-position three-way solenoid valve 410 is closely attached to one end face of the flow guiding block 420, and the liquid is guided by the liquid outlet flow guiding hole 425 and the liquid inlet flow guiding hole 424. The axial directions of the liquid outlet flow guiding hole 425 and the liquid inlet flow guiding hole 424 are perpendicular to the end face of the flow guiding block 420 that is closely attached to the valve port of the two-position three-way solenoid valve 410, and are also perpendicular to the directions of the liquid inlet hole 421 and the liquid outlet hole 422. In this way, the ports of the liquid inlet hole 421 and the liquid outlet hole 422 and the liquid outlet flow guiding hole 425 and the liquid inlet flow guiding hole 424 are on different mounting surfaces, so that the effective mounting area of the flow guiding block 420 can be fully utilized, and it is not easy for the liquid inlet head and the liquid outlet head to interfere with the two-position three-way solenoid valve. The external liquid can quickly and accurately enter the two-position three-way solenoid valve 410 through the liquid inlet flow guiding hole 424 and then enter the pump body 100 through the middle flow hole 423. The liquid in the pump body 100 can also enter the two-position three-way solenoid valve 410 through the middle flow hole 423 first and then be guided to the liquid outlet hole 422 through the liquid outlet flow guiding hole 425 and thus be discharged outside the pump body 100. The middle flow hole 423 is located in the middle, and the liquid outlet flow guiding hole 425 and the liquid inlet flow guiding hole 424 are respectively located on both sides of the middle flow hole 423, so that the liquid inlet and liquid outlet processes of the pump body 100 do not affect each other, thereby improving the accuracy of liquid inlet and liquid outlet. In addition, the flow guiding block 420 further includes an intermediate liquid inlet flow guiding hole that is perpendicular to and communicates with both the liquid inlet hole 421 and the liquid inlet flow guiding hole 424, and an intermediate liquid outlet flow guiding hole that is perpendicular to and communicates with both the liquid outlet hole 422 and the liquid outlet flow guiding hole 425, so that the liquid inlet head and the liquid outlet head can flexibly select positions according to the installation requirements.

[0060] Embodiment 5

[0061] The liquid metering pump of this embodiment further includes a detection device and a controller. The detection device is used to generate a trigger signal when it detects that the plunger 200 moves to a predetermined position and send the trigger signal to the controller. The controller controls the driving device 300 according to the received trigger signal to make the plunger 200 stop at the current position.

[0062] Wherein the predetermined position is used to control the advancing distance of the plunger 200, and the predetermined position can be determined according to the amount of liquid to be infused. The detection device can adopt a photoelectric switch 500, which can be installed on the mounting substrate, and the signal output end of the photoelectric switch 500 is connected to the signal input end of the controller. Correspondingly, an induction probe 600 can be arranged on the component of the output component 330 (such as the bottom plate 335) so that the induction probe 600 moves synchronously with the plunger 200. When the plunger 200 moves to the specified position, the induction probe 600 triggers the photoelectric switch 500, causing the controller to cut off the power supply of the driving device 300 and making the plunger 200 stop at the current position. The controller can be a single-chip microcomputer, an industrial control computer, a PLC or other controllers. The user can also input the amount of liquid to be infused into the control through input devices such as a touch screen, a keyboard, and a mouse, and the controller controls the moving distance of the plunger 200 according to the amount of liquid to be infused input by the user. When the amount of liquid to be infused changes, the user can re-enter the changed amount into the controller. In addition, the user can also directly input the moving distance of the plunger 200 to the controller according to the amount of liquid to be infused. Controlling the plunger 200 to move a corresponding distance according to the amount of liquid to be infused input by the user or the moving distance of the plunger 200 can be achieved by a person of ordinary skill in the art through programming the controller. The programming method belongs to the prior art and will not be elaborated here.

[0063] Embodiment 6

[0064] This embodiment provides an electrolyte infusion device, and the electrolyte infusion device includes the liquid metering pump in Embodiments 1 to 4. The electrolyte infusion device further includes a gas-liquid separation device

[0065] The gas-liquid separation device includes:

[0066] A liquid storage container for storing the electrolyte to be processed;

[0067] The liquid to be processed refers to the liquid from which the protective gas needs to be separated. The liquid storage container can adopt a stainless steel storage tank, and the storage tank can adopt a cylindrical structure.

[0068] When the separation device in this embodiment is in use, the liquid to be subjected to the infusion operation is first input into the storage container through the liquid inlet channel. After the separation is completed, the processed liquid is input into the liquid metering pump through the liquid storage channel. When separating and processing the liquid, it is connected to a vacuum device through a vacuum channel, so that the vacuum device sucks the gas in the storage container, and normal pressure is introduced into the liquid storage container through the normal pressure channel.

[0069] A liquid inlet channel for inputting the liquid to be processed into the liquid storage container;

[0070] A liquid outlet channel for outputting the processed electrolyte from the liquid storage container to the liquid metering pump;

[0071] An atmospheric pressure channel for introducing atmospheric pressure into the liquid storage container;

[0072] A vacuum channel for connecting the interior of the liquid storage container to a vacuum device;

[0073] A first switching device for opening or closing the liquid inlet channel;

[0074] When the first switching device is open, the interior of the storage container is connected to the pipeline for inputting the liquid to be processed, so that the liquid inlet channel is opened. When the first switching device is closed, the interior of the storage container and the pipeline for inputting the liquid to be processed are isolated by the first switching device, so that the liquid inlet channel is closed.

[0075] A second switching device for opening or closing the liquid outlet channel;

[0076] When the second switching device is open, the interior of the storage container is connected to the pipeline for outputting the liquid to be processed, so that the liquid outlet channel is opened. When the second switching device is closed, the interior of the storage container and the pipeline for outputting the liquid to be processed are isolated by the second switching device, so that the liquid outlet channel is closed.

[0077] A third switching device for opening or closing the atmospheric pressure channel;

[0078] When the third switching device is open, the interior of the storage container is connected to the pipeline for inputting atmospheric pressure gas, so that the atmospheric pressure channel is opened. When the third switching device is closed, the interior of the storage container and the pipeline for inputting atmospheric pressure gas are isolated by the third switching device, and the atmospheric pressure channel is closed.

[0079] A fourth switching device for opening or closing the vacuum channel.

[0080] When the fourth switching device is open, the interior of the storage container is connected to the pipeline connected to the vacuum device, so that the vacuum channel is opened. When the fourth switching device is closed, the interior of the storage container and the pipeline connected to the vacuum device are isolated by the fourth switching device, so that the vacuum channel is closed.

[0081] Specifically, the first switching device is a liquid inlet valve, the second switching device is a liquid outlet valve, the third switching device is an atmospheric pressure valve, and the fourth switching device is a vacuum valve. For the convenience of manual operation, the liquid inlet valve, the liquid outlet valve, the atmospheric pressure valve, and the vacuum valve can all be ball valves. The operator can switch the open or closed state of each switching device by turning the operating handle of the ball valve. Among them, the liquid inlet channel, the liquid outlet channel, the atmospheric pressure channel, and the vacuum channel can adopt pipelines connected to the interior of the storage container. The first switching device, the second switching device, the third switching device, and the fourth switching device can be respectively installed on the corresponding pipelines.

[0082] In addition, for the convenience of realizing automatic control, the first switch device, the second switch device, the third switch device, and the fourth switch device in this embodiment may also adopt solenoid valves. Correspondingly, a controller is added to the device for separating gas from liquid. The controller controls the opening and closing actions of the solenoid valves according to the process requirements of the separation process.

[0083] As an example, the device for separating gas from liquid in this embodiment further includes a timing device. The timing device is used to time the opening time of the fourth switch device and generate a second trigger signal when the timing reaches a preset first time threshold. The timing device is also used to time the opening time of the third switch device and generate a third trigger signal when the timing reaches a preset second time threshold.

[0084] In this embodiment, the time for each vacuum pumping operation and the time for introducing normal pressure gas can be controlled according to the requirements for separation effect in actual applications. The specific method is as follows: When the timing device controls the fourth switch in the vacuum channel to open and the vacuum device starts to pump vacuum on the liquid storage container, the timing starts. When the vacuum pumping time reaches the time required by the process, the timer generates a trigger signal. After receiving this trigger signal, the controller controls the fourth switch device to close, stops the vacuum pumping operation, and controls the third switch device to open, starting to introduce normal pressure gas into the liquid storage container. At the same time, the timing device starts timing. When the time for introducing normal pressure reaches the process requirement, the timer generates a trigger signal. After receiving the trigger signal, the controller controls the third switch device to close. As another example, in order to save costs, after the timer generates a trigger signal, the fourth switch device and the third switch device can be opened or closed manually.

[0085] In order to further improve the gas separation effect, in this embodiment, the operation of repeatedly pumping vacuum and then introducing normal pressure gas can be performed. For this purpose, the device for separating gas from liquid in this embodiment further includes a counting device. The counting device is used to record the number of times the fourth switch device is opened and closed, and send a fourth trigger signal to the controller when the number of times the fourth switch device is opened and closed reaches a preset number threshold. Specifically, during implementation, the controller can first control the fourth switch device to open for vacuum pumping according to the process requirements. When the set vacuum pumping time is reached, the controller controls the fourth switch device to disconnect, and the counting device counts once. Then, the controller controls the third switch device to open to introduce normal pressure gas into the liquid storage container. After the introduction of normal pressure gas is completed, the vacuum pumping operation is repeated and counted. When the repeated operation of pumping vacuum and then introducing normal pressure gas reaches the set number of times, the counter generates a trigger signal. After receiving the trigger signal, the controller controls the second switch device to open and conveys the processed liquid to the next link. The aforementioned controller can adopt a single-chip microcomputer, an industrial control computer, a PLC, etc.

[0086] Implementation 7

[0087] This embodiment provides a method for liquid perfusion using the liquid metering pump described in Embodiments 1 to 4, including the following steps:

[0088] S1. The liquid path control device cuts off the liquid outlet path of the pump body and connects the liquid inlet path of the pump body;

[0089] S2. According to the specified amount of liquid entering the liquid metering pump, control the driving device to drive the plunger to move a first preset distance away from the pump body to suck a specified amount of liquid into the plunger pump;

[0090] S3. The liquid path control device cuts off the liquid inlet path of the pump body and connects the liquid outlet path of the pump body;

[0091] S4. According to the specified amount of liquid output from the liquid metering pump, control the driving device to drive the plunger to move a second preset distance towards the pump body to discharge a specified amount of liquid from the plunger pump.

[0092] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Liquid metering pump, characterized in that, The liquid metering pump includes: A pump body for accommodating the liquid to be metered, and the inner wall of the pump body is a hollow cylinder; A plunger connected to the pump body in a manner that can move relative to the pump body along its axial direction; A driving device for driving the plunger to move a preset distance relative to the pump body along its axial direction according to the volume of the liquid to be metered that needs to enter or exit the pump body. The driving device includes an output component for outputting linear motion; A transmission adjustment device that forms a transmission connection between the output component of the driving device and the plunger, and is used to adjust the relative position and / or angle between the output component of the driving device and the plunger during the process of the driving device driving the plunger to move along the axial direction of the pump body; A liquid path control device for cutting off or connecting the liquid inlet path and the liquid outlet path of the pump body when the plunger moves relative to the pump body to change the volume of the accommodating space, so that the liquid to be metered enters or exits the liquid metering pump; The driving device further includes a motor and a ball screw. The motor is used to drive the ball screw to drive the plunger to perform a reciprocating linear motion relative to the pump body through the output component; The transmission adjustment device includes a first spherical plain bearing, a second spherical plain bearing and a connecting rod. The output component is formed with a first bearing mounting hole for mounting the first spherical plain bearing and a second bearing mounting hole for mounting the second spherical plain bearing. The first bearing mounting hole and the second bearing mounting hole are located on both sides of the plunger in the radial direction. The opposite ends of the connecting rod in the radial direction of the plunger are respectively connected to the first spherical plain bearing and the second spherical plain bearing, and the middle part of the connecting rod is connected to the plunger.

2. The liquid metering pump according to claim 1, wherein The liquid metering pump includes multiple pairs of pump bodies and plungers arranged side by side in a direction perpendicular to the guiding direction of the guiding mechanism, as well as connecting rods, first spherical plain bearings and second spherical plain bearings corresponding to each plunger one by one, and each plunger is connected to its corresponding connecting rod, first spherical plain bearing and second spherical plain bearing.

3. The liquid metering pump according to claim 2, characterized in that, The output component includes a driving connection plate, a bottom plate, a top plate and an intermediate connection plate. One end of the driving connection plate is in transmission connection with the ball screw, and the opposite end is connected to the bottom plate. The bottom plate is connected to the moving part of the guiding mechanism. The first bearing mounting hole is formed on the bottom plate. The top plate is connected to the bottom plate through the intermediate connection plate. The second bearing mounting hole is formed on the top plate. The bottom plate and the top plate are respectively located on both sides of the plunger in the radial direction.

4. The liquid metering pump according to any one of claims 1 to 3, characterized in that, The liquid path control device includes a two-position three-way solenoid valve. When the liquid metering pump is in the liquid inlet state, the two-position three-way solenoid valve switches to a state where the liquid inlet path of the liquid metering pump is opened and the liquid outlet path of the liquid metering pump is closed at the same time. When the liquid metering pump is in the liquid outlet state, the two-position three-way solenoid valve switches to a state where the liquid inlet path of the liquid metering pump is closed and the liquid outlet path of the liquid metering pump is opened at the same time.

5. The liquid metering pump according to claim 4, characterized in that, The liquid path control device further includes a diversion block. The diversion block is rectangular. A connection hole communicating with the accommodation space is formed on the diversion block. One side of the diversion block abuts against the side of the two-position three-way solenoid valve where the valve port is formed. The diversion block includes a middle flow hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the connection hole. An inlet liquid hole and an outlet liquid hole are further formed on the diversion block. The diversion block includes an inlet liquid diversion hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the inlet liquid hole. The diversion block includes an outlet liquid diversion hole formed by extending from the side of the diversion block abutting against the two-position three-way solenoid valve in a direction opposite to the two-position three-way solenoid valve to a position communicating with the outlet liquid hole. When the liquid metering pump intakes liquid, the middle flow hole communicates with the inlet liquid diversion hole through the two-position three-way solenoid valve. When the liquid metering pump discharges liquid, the middle flow hole communicates with the outlet liquid diversion hole through the two-position three-way solenoid valve.

6. The liquid metering pump according to any one of claims 1 to 3, characterized in that, It further includes a detection device and a controller. The detection device is used to generate a trigger signal when detecting that the plunger moves to a predetermined position and send the trigger signal to the controller. The controller controls the driving device according to the received trigger signal to make the plunger stop at the current position.

7. An electrolyte filling device, characterized in that, The electrolyte filling device includes the liquid metering pump according to any one of claims 1 to 6.

8. A method for liquid perfusion using the liquid metering pump according to any one of claims 1 to 6, characterized in that, It includes the following steps: The liquid path control device cuts off the liquid outlet path of the pump body and connects the liquid inlet path of the pump body; According to the specified amount of liquid entering the liquid metering pump, control the driving device to drive the plunger to move a first preset distance away from the pump body to suck a specified amount of liquid into the plunger pump; The liquid path control device cuts off the liquid inlet path of the pump body and connects the liquid outlet path of the pump body; According to the specified amount of liquid output from the liquid metering pump, control the driving device to drive the plunger to move a second preset distance towards the pump body to discharge a specified amount of liquid from the plunger pump.

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