技术领域technical field
本发明涉及对液体的微滴喷射设备领域，尤其是涉及一种基于磁致伸缩执行器的开关流量控制型微滴喷射装置。The invention relates to the field of droplet spraying equipment for liquids, in particular to a switch flow control type droplet spraying device based on a magnetostrictive actuator.
背景技术Background technique
随着社会的发展，可持续发展概念的提出，一些新的加工技术不断涌现出来，微滴喷射技术就是其中的一种热门加工技术。现在比较常用的是微滴喷射技术中的按需喷射模式，按需微滴喷射按其工作原理又分好多种，技术比较成熟的有压电式微滴喷射技术、气压直接驱动式微滴喷射技术和热泡式微滴喷射技术。With the development of society and the concept of sustainable development, some new processing technologies are constantly emerging, and droplet jetting technology is one of the popular processing technologies. Nowadays, the on-demand injection mode in droplet jetting technology is more commonly used. On-demand droplet jetting can be divided into many kinds according to its working principle. The more mature technologies include piezoelectric droplet jetting technology, air pressure direct drive droplet jetting technology and Thermal bubble droplet jetting technology.
压电式微滴喷射技术如压电式喷墨打印技术，使用范围最广，虽然其对液体的控制能力强，容易实现高精度的喷射，而且喷射频率高，但是由于其采用压电陶瓷作驱动源，不能承受温度高的液体材料，而且不能喷射高粘度的液体，通常液体粘度低于20cps，使得可喷射的液体材料的范围大大减小。其次，压电式喷墨打印技术中存在一个普遍的问题，喷嘴的堵塞，使得需要花费大量时间去清洗，或者直接损坏打印头。最后，在压电式喷墨打印技术中，需要调节背压，使得在没有驱动力时，液体在喷头中不滴落下来，背压的调节直接影响液滴的喷射，但背压的调节困难，干扰多。Piezoelectric droplet ejection technology, such as piezoelectric inkjet printing technology, is the most widely used. Although it has a strong ability to control liquids, it is easy to achieve high-precision ejection, and the ejection frequency is high, but because it uses piezoelectric ceramics as the drive The source cannot withstand high-temperature liquid materials, and cannot spray high-viscosity liquids. Usually, the liquid viscosity is lower than 20cps, which greatly reduces the range of liquid materials that can be sprayed. Secondly, there is a common problem in the piezoelectric inkjet printing technology, the clogging of the nozzles, which makes it take a lot of time to clean, or directly damage the print head. Finally, in the piezoelectric inkjet printing technology, it is necessary to adjust the back pressure so that the liquid does not drip down in the nozzle when there is no driving force. The adjustment of the back pressure directly affects the ejection of the droplets, but the adjustment of the back pressure is difficult. , a lot of interference.
气压直接驱动式微滴喷射技术具有喷射力大，能喷射高粘度的液体材料，适用材料范围广泛，液体材料中可含大量的固体微粒而不易堵塞。但是在喷射过程中，开始时喷腔内装满溶液，随着过程的不断进行，喷腔内的液体体积逐渐减小，喷腔内的气体体积不断增大，在同样的动作时间和压力下，喷射出的液滴体积会逐渐减小，使得喷射液滴的体积精度和一致性难于控制。其次，喷射液滴的容量由喷腔大小决定，通常比较小，不能长时间的持续工作。最后，在喷射过程中，气体压力脉冲工作时间难以精确控制。Pneumatic direct-driven droplet injection technology has a large injection force and can spray high-viscosity liquid materials. It is applicable to a wide range of materials. The liquid materials can contain a large amount of solid particles and are not easy to block. However, during the spraying process, the spray chamber is filled with solution at the beginning. As the process continues, the liquid volume in the spray chamber gradually decreases, and the gas volume in the spray chamber continues to increase. Under the same action time and pressure , the volume of the ejected droplets will gradually decrease, making it difficult to control the volume accuracy and consistency of the ejected droplets. Secondly, the capacity of sprayed droplets is determined by the size of the spray chamber, which is usually relatively small and cannot continue to work for a long time. Finally, during the injection process, it is difficult to precisely control the working time of the gas pressure pulse.
热泡式微滴喷射技术因没有固体活动件而具有较高的可靠性，且成本低，用途广泛。热气泡式微喷系统包括阵列的发射腔和辅助控制的集成电路。其中的发射腔就是细小的执行器。喷射的具体物理过程是：脉冲电流加热电阻薄膜进而汽化发射腔内的流体微团，当气泡迅速长大产生高压，并传递动量给周围流体，驱使流体从喷嘴弹射出去，其中，整个过程只有流体是活动件。The thermal bubble droplet ejection technology has high reliability due to the lack of solid moving parts, and is low in cost and widely used. The thermal bubble micro-spray system includes an array of firing chambers and an auxiliary control integrated circuit. The firing cavity is the tiny actuator. The specific physical process of injection is: the pulse current heats the resistive film and then vaporizes the fluid cluster in the firing chamber. When the bubble grows rapidly, high pressure is generated, and the momentum is transmitted to the surrounding fluid, driving the fluid to be ejected from the nozzle. In the whole process, only the fluid is an active piece.
发明内容Contents of the invention
本发明提供了一种基于磁致伸缩执行器的开关流量控制型微滴喷射装置，以压缩气体供应模块提供的压缩气体作为液体喷射和喷腔进液的动力源，磁致伸缩执行器能够控制推杆与喷腔喷口之间的空隙大小，从而能够控制喷射液体流量的大小。The present invention provides a switch flow control type droplet spraying device based on a magnetostrictive actuator. The compressed gas provided by the compressed gas supply module is used as the power source for liquid spraying and liquid injection into the spray chamber. The magnetostrictive actuator can control The size of the gap between the push rod and the nozzle of the spray chamber can control the size of the jet liquid flow.
一种基于磁致伸缩执行器的开关流量控制型微滴喷射装置，包括控制系统、带喷口的喷腔、与喷腔喷口连接的喷嘴、与所述喷腔连接的储液罐以及与所述喷腔和储液罐连接的压缩气体供应模块，所述喷腔内设有推杆，所述推杆的一端与所述喷腔喷口配合，所述推杆的另一端设有驱动所述推杆轴向运动的磁致伸缩执行器。A switch flow control type droplet ejection device based on a magnetostrictive actuator, comprising a control system, a spray chamber with a nozzle, a nozzle connected to the nozzle of the spray chamber, a liquid storage tank connected to the spray chamber, and the The compressed gas supply module connected to the spray chamber and the liquid storage tank, the spray chamber is provided with a push rod, one end of the push rod cooperates with the nozzle of the spray chamber, and the other end of the push rod is provided with a Magnetostrictive actuator for axial movement of the rod.
本发明中，储液罐储存待喷射的液体，压缩气体供应模块输出压缩气体到储液罐，将待喷射的液体压入喷腔，待喷射的液体压入到喷腔后，压缩气体供应模块输出压缩气体到喷腔，使得喷腔内的液体从喷嘴喷出。通过磁致伸缩执行器可以控制推杆的轴向运动，当推杆与喷腔喷口配合的一端顶住喷腔喷口，可将喷腔喷口封住；当推杆与喷腔喷口配合的一端和喷腔喷口之间留有空隙，喷腔内的液体从喷腔喷口喷出，通过磁致伸缩执行器可以控制推杆与喷腔喷口之间的空隙大小，从而控制喷射液体流量的大小。In the present invention, the liquid storage tank stores the liquid to be sprayed, the compressed gas supply module outputs the compressed gas to the liquid storage tank, presses the liquid to be sprayed into the spray cavity, and after the liquid to be sprayed is pressed into the spray cavity, the compressed gas supply module Output compressed gas to the spray chamber, so that the liquid in the spray chamber is ejected from the nozzle. The axial movement of the push rod can be controlled by the magnetostrictive actuator. When the end of the push rod matched with the nozzle of the spray chamber withstands the nozzle of the spray chamber, the nozzle of the spray chamber can be sealed; when the end of the push rod matched with the nozzle of the spray chamber and There is a gap between the nozzles of the spray chamber, and the liquid in the spray chamber is ejected from the nozzle of the spray chamber. The size of the gap between the push rod and the nozzle of the spray chamber can be controlled by the magnetostrictive actuator, thereby controlling the flow rate of the sprayed liquid.
作为优选，所述磁致伸缩执行器包括：与所述推杆背离所述喷腔喷口的一端固接的磁致伸缩元件、对称布置在所述磁致伸缩元件两侧的永久磁铁以及缠绕在所述永久磁铁周围的线圈。通过线圈和永久磁铁在磁致伸缩元件周围产生磁场，使得磁致伸缩元件在磁场的作用下缩短或伸长。所述线圈通过电流控制模块受控于控制系统，控制系统通过电流控制模块控制线圈中电流的大小，从而控制磁场强度的大小，进而可以控制间隙的大小，控制液体的流量，实现开关流量控制的目的。Preferably, the magnetostrictive actuator includes: a magnetostrictive element affixed to the end of the push rod away from the nozzle of the spray chamber, permanent magnets symmetrically arranged on both sides of the magnetostrictive element and wound around coil around the permanent magnet. A magnetic field is generated around the magnetostrictive element through coils and permanent magnets, so that the magnetostrictive element shortens or elongates under the action of the magnetic field. The coil is controlled by the control system through the current control module, and the control system controls the magnitude of the current in the coil through the current control module, thereby controlling the magnitude of the magnetic field strength, and then can control the size of the gap, control the flow of the liquid, and realize the on-off flow control. Purpose.
对于具有缩短属性的磁致伸缩元件，当磁致伸缩执行器不工作时，推杆与喷腔喷口配合的一端刚好顶住喷腔喷口，从而将喷腔喷口封住，喷腔内的液体无法从喷腔喷口喷出，更无法从喷嘴喷出。当磁致伸缩执行器工作时，磁致伸缩元件缩短，驱动推杆与喷腔喷口配合的一端从喷腔喷口缩回，使得推杆与喷腔喷口配合的一端与喷腔喷口之间存在空隙，喷腔内的液体从喷腔喷口的喷出，然后再从喷嘴喷出，通过磁致伸缩执行器可以控制间隙的大小，从而控制喷射液体流量的大小。For magnetostrictive elements with shortening properties, when the magnetostrictive actuator is not working, the end of the push rod that matches the nozzle of the spray chamber just withstands the nozzle of the spray chamber, thereby sealing the nozzle of the spray chamber, and the liquid in the spray chamber cannot It is sprayed from the nozzle of the spray chamber, and it cannot be sprayed from the nozzle. When the magnetostrictive actuator works, the magnetostrictive element is shortened, and the end of the driving push rod that matches the nozzle of the spray chamber is retracted from the nozzle of the spray chamber, so that there is a gap between the end of the push rod that cooperates with the nozzle of the spray chamber and the nozzle of the spray chamber , the liquid in the spray chamber is sprayed from the nozzle of the spray chamber, and then sprayed out from the nozzle. The size of the gap can be controlled by the magnetostrictive actuator, thereby controlling the flow of the sprayed liquid.
对于具有伸长属性的磁致伸缩元件，当磁致伸缩执行器工作时，磁致伸缩元件伸长，推杆与喷腔喷口配合的一端伸长后刚好顶住喷腔喷口，从而将喷腔喷口封住，喷腔内的液体无法从喷腔喷口的喷出，更无法喷嘴喷出。当磁致伸缩执行器不工作时，推杆恢复到原有的尺寸长度，驱动推杆与喷腔喷口配合的一端从喷腔喷口缩回，使得推杆与喷腔喷口配合的一端与喷腔喷口之间存在间隙，喷腔内的液体从喷腔喷口的喷出，然后再从喷嘴喷出，通过磁致伸缩执行器可以控制间隙的大小，从而控制喷射液体流量的大小。For the magnetostrictive element with elongation property, when the magnetostrictive actuator is working, the magnetostrictive element is elongated, and the end of the push rod that matches the nozzle of the spray chamber is stretched to just withstand the nozzle of the spray chamber, so that the spray chamber The nozzle is sealed, and the liquid in the spray chamber cannot be ejected from the nozzle of the spray chamber, let alone the nozzle. When the magnetostrictive actuator does not work, the push rod returns to its original size and length, and the end of the push rod that is matched with the nozzle of the spray chamber is retracted from the nozzle of the spray chamber, so that the end of the push rod that is matched with the nozzle of the spray chamber is aligned with the nozzle of the spray chamber. There is a gap between the nozzles, the liquid in the spray chamber is sprayed from the nozzle of the spray chamber, and then sprayed out from the nozzle, the size of the gap can be controlled by the magnetostrictive actuator, thereby controlling the flow of the sprayed liquid.
作为优选，所述压缩气体供应模块的出口处设有总调压阀，所述总调压阀受控于所述控制系统，通过控制系统可以调节控制总调压阀，总调压阀可以调节从压缩气体供应模块输出的压缩气体的压力，调整后，再输向喷腔和储液罐，从而更好满足使用要求。As a preference, a general pressure regulating valve is provided at the outlet of the compressed gas supply module, and the general pressure regulating valve is controlled by the control system. The pressure of the compressed gas output from the compressed gas supply module is adjusted, and then sent to the spray chamber and the liquid storage tank, so as to better meet the use requirements.
作为优选，所述压缩气体供应模块分别通过第一支路和第二支路与所述喷腔和储液罐连接，即所述压缩气体供应模块通过第一支路与所述喷腔连接，所述压缩气体供应模块通过第二支路与所述储液罐连接，所述第一支路上设有第一电磁阀，所述第二支路上设有第二电磁阀，所述第一电磁阀和第二电磁阀均受控于所述控制系统。通过控制系统控制第一电磁阀和第二电磁阀的开闭，从而控制第一支路和第二支路的通断。Preferably, the compressed gas supply module is respectively connected to the spray chamber and the liquid storage tank through a first branch and a second branch, that is, the compressed gas supply module is connected to the spray chamber through a first branch, The compressed gas supply module is connected to the liquid storage tank through a second branch, a first solenoid valve is provided on the first branch, a second solenoid valve is provided on the second branch, and the first solenoid Both the valve and the second solenoid valve are controlled by the control system. The control system controls the opening and closing of the first solenoid valve and the second solenoid valve, thereby controlling the on-off of the first branch circuit and the second branch circuit.
进一步优选，所述第一支路上设有第一调压阀，所述第一调压阀受控于所述控制系统，通过控制系统可以调节控制第一调压阀，第一调压阀可以调节第一支路上压缩气体的压力，调整后，再输向喷腔，从而一定意义上通过调节压缩气体的压力可控制喷射的液体流量。Further preferably, a first pressure regulating valve is provided on the first branch, the first pressure regulating valve is controlled by the control system, the first pressure regulating valve can be adjusted and controlled by the control system, and the first pressure regulating valve can be Adjust the pressure of the compressed gas on the first branch, and then send it to the spray chamber after adjustment, so that in a certain sense, the flow rate of the injected liquid can be controlled by adjusting the pressure of the compressed gas.
作为优选，所述喷腔的顶部连接有排气口，所述排气口处设置有排气电磁阀，所述排气电磁阀受控于所述控制系统。通过控制系统控制排气电磁阀的开闭，当将储液罐中待喷射的液体压入喷腔时，需要打开排气电磁阀，进行排气，使得储液罐中待喷射的液体顺利压入喷腔。当喷腔内的液体待喷射时，需要关闭排气电磁阀，压缩气体供应模块输出压缩气体到喷腔，使得喷腔内的液体从喷嘴喷出。Preferably, an exhaust port is connected to the top of the spray chamber, and an exhaust solenoid valve is arranged at the exhaust port, and the exhaust solenoid valve is controlled by the control system. The opening and closing of the exhaust solenoid valve is controlled by the control system. When the liquid to be sprayed in the liquid storage tank is pressed into the spray chamber, the exhaust solenoid valve needs to be opened to exhaust, so that the liquid to be sprayed in the liquid storage tank can be pressed smoothly. into the spray chamber. When the liquid in the spray chamber is to be sprayed, the exhaust solenoid valve needs to be closed, and the compressed gas supply module outputs compressed gas to the spray chamber, so that the liquid in the spray chamber is sprayed out from the nozzle.
作为优选，所述储液罐与喷腔设有液体从储液罐流向喷腔的单向阀，所述单向阀受控于所述控制系统。使用单向阀后，在压缩气体供应模块作用下，能够顺利地将液体从储液罐压入喷腔，并且能够防止喷腔内液体向储液罐倒流。控制系统控制单向阀的开闭，对储液罐向喷腔输送液体进行控制。Preferably, the liquid storage tank and the spray chamber are provided with a one-way valve for liquid to flow from the liquid storage tank to the spray chamber, and the one-way valve is controlled by the control system. After using the one-way valve, under the action of the compressed gas supply module, the liquid can be smoothly pressed from the liquid storage tank into the spray chamber, and the liquid in the spray chamber can be prevented from flowing back to the liquid storage tank. The control system controls the opening and closing of the one-way valve, and controls the delivery of liquid from the liquid storage tank to the spray chamber.
作为优选，所述喷腔内设有与所述控制系统连接的液面检测模块，所述液面检测模块包括用于向喷腔内液面发出信号的信号发射源以及用于接收所述信号发射源发出并经液面反射后的信号的信号接收端，随着喷腔内液面的上升或下降，在一定的液面高度范围内，信号发射源发出的信号经液面反射后，信号接收端能够接收到，当液面高于该高度范围，信号接收端无法接收到信号发射源发出的信号，则这时应停止储液罐向喷腔输送液体，当液面低于该高度范围，信号接收端无法接收到信号发射源发出的信号，则这时应停止喷射液体，需要储液罐向喷腔输送液体。Preferably, a liquid level detection module connected to the control system is provided in the spray chamber, and the liquid level detection module includes a signal transmitting source for sending a signal to the liquid level in the spray chamber and a signal source for receiving the signal The signal receiving end of the signal emitted by the emission source and reflected by the liquid surface, as the liquid level in the spray chamber rises or falls, within a certain range of liquid level height, the signal emitted by the signal emission source is reflected by the liquid surface, and the signal The receiving end can receive it. When the liquid level is higher than the height range, the signal receiving end cannot receive the signal from the signal transmitter. At this time, the liquid storage tank should stop delivering liquid to the spray chamber. When the liquid level is lower than the height range , the signal receiving end cannot receive the signal from the signal emitting source, then the spraying of liquid should be stopped at this time, and the liquid storage tank is required to deliver liquid to the spray chamber.
作为优选，所述喷嘴与所述喷腔喷口螺纹连接，即可拆卸连接中的一种，采用可更换的喷嘴设计，使得喷嘴拆卸十分方便，在一定程度上解决了喷嘴堵塞的问题，可以方便地清洗和更换阻塞的或损坏的喷嘴。进一步优选，所述喷嘴与所述喷腔喷口之间设有密封圈，增加密封性，防止液体流出。As a preference, the nozzle is threadedly connected to the spout of the spray chamber, which is one of detachable connections. The replaceable nozzle design is adopted, which makes the nozzle disassembly very convenient, solves the problem of nozzle clogging to a certain extent, and can be convenient Properly clean and replace clogged or damaged nozzles. Further preferably, a sealing ring is provided between the nozzle and the nozzle of the spray chamber to increase the sealing performance and prevent the liquid from flowing out.
与现有技术相比，本发明具有如下优点：Compared with prior art, the present invention has following advantage:
本发明基于磁致伸缩执行器的开关流量控制型微滴喷射装置，以压缩气体供应模块提供的压缩气体作为液体喷射和喷腔进液的动力源，通过压缩气体挤压液体进行液滴喷射，喷射力大，在相同喷嘴内径的情况下，能喷射粘度更大的液体材料，而且适用材料范围广泛，喷嘴不易堵塞。通过液体供应过程的设计，可以一次喷射大量的液滴，便于长时间的工作。在喷射过程中，压缩气体一直存在，避免了传统气压直接驱动中气体压力脉冲工作时间难以精确控制的问题。磁致伸缩执行器能够控制推杆与喷腔喷口之间的空隙大小，从而能够非常好地控制喷射液体流量的大小，可以实现液滴按需，体积可控的高精度喷射，重复性好，而且由于磁致伸缩执行器的特性，液滴的喷射频率高，同时结合了连续喷射的优点。本发明基于磁致伸缩执行器的开关流量控制型微滴喷射装置，可以在高温的环境下，长时间的持续工作，适用于喷射高粘度的液体，而且液滴喷射频率高，体积可控性高，一致性好。The present invention is based on the switching flow control type droplet injection device of the magnetostrictive actuator. The compressed gas provided by the compressed gas supply module is used as the power source for liquid injection and liquid injection into the spray chamber, and the liquid is squeezed by the compressed gas to perform droplet injection. The spraying force is large, and in the case of the same inner diameter of the nozzle, it can spray liquid materials with higher viscosity, and it is suitable for a wide range of materials, and the nozzle is not easy to block. Through the design of the liquid supply process, a large number of liquid droplets can be sprayed at one time, which is convenient for long-term work. During the injection process, the compressed gas always exists, which avoids the problem that the working time of the gas pressure pulse in the traditional air pressure direct drive is difficult to control precisely. The magnetostrictive actuator can control the size of the gap between the push rod and the nozzle of the spray chamber, so that it can control the flow rate of the sprayed liquid very well, and can realize droplet on-demand, high-precision spraying with controllable volume, good repeatability, Moreover, due to the characteristics of the magnetostrictive actuator, the ejection frequency of droplets is high, while combining the advantages of continuous ejection. The present invention is based on a magnetostrictive actuator switch flow control type droplet spraying device, which can work continuously for a long time in a high-temperature environment, is suitable for spraying high-viscosity liquids, and has high droplet spraying frequency and volume controllability High, good consistency.
本发明基于磁致伸缩执行器的开关流量控制型微滴喷射装置，在优选的技术方案中，所述喷腔内设有液面检测模块，通过将液面高度保持在一个期望的范围内，避免了传统气压直接驱动中存在的问题，使喷射液滴的体积精度和一致性得到很好地控制。通过可更换的喷嘴模块的设计，可以方便地清洗和更换堵塞的或损坏的喷嘴，很好地解决了喷嘴堵塞的问题。The present invention is based on the switching flow control type droplet ejection device of the magnetostrictive actuator. In a preferred technical solution, a liquid level detection module is provided in the spray chamber, and by keeping the liquid level height within a desired range, It avoids the problems existing in the traditional air pressure direct drive, so that the volume accuracy and consistency of the sprayed droplets are well controlled. Through the design of replaceable nozzle modules, clogged or damaged nozzles can be cleaned and replaced conveniently, which solves the problem of nozzle clogging well.
附图说明Description of drawings
图1为本发明基于磁致伸缩执行器的开关流量控制型微滴喷射装置的结构示意图；Fig. 1 is the structural representation of the switching flow control type droplet ejection device based on the magnetostrictive actuator of the present invention;
图2为本发明喷腔内具体结构示意图；Fig. 2 is the specific structure schematic diagram in the spray cavity of the present invention;
图3为图2中沿A-A剖面线的剖视图；Fig. 3 is a sectional view along the section line A-A in Fig. 2;
图中，1为压缩气体供应模块，2为总调压阀，3为T型接头，4为第一调压阀，5为第一电磁阀，6为T型接头，7为排气电磁阀，8为信号发射源，9为信号接收端，10为喷腔，11为单向阀，12为储液罐，13为第二电磁阀，100为流量控制模块，101为磁致伸缩元件，102为线圈，103为永久磁铁，104为容腔，105为推杆，201为螺母，202为密封圈，203为喷嘴。In the figure, 1 is the compressed gas supply module, 2 is the main pressure regulating valve, 3 is the T-shaped joint, 4 is the first pressure regulating valve, 5 is the first solenoid valve, 6 is the T-shaped joint, and 7 is the exhaust solenoid valve , 8 is a signal transmitting source, 9 is a signal receiving end, 10 is a spray chamber, 11 is a one-way valve, 12 is a liquid storage tank, 13 is a second solenoid valve, 100 is a flow control module, 101 is a magnetostrictive element, 102 is a coil, 103 is a permanent magnet, 104 is a cavity, 105 is a push rod, 201 is a nut, 202 is a sealing ring, and 203 is a nozzle.
具体实施方式detailed description
如图1所示，为基于磁致伸缩执行器的开关流量控制型微滴喷射装置，包括带喷口的喷腔10、与喷腔喷口连接的喷嘴203、与喷腔10连接的储液罐12、与喷腔10和储液罐12连接的压缩气体供应模块1以及控制系统。喷腔10内设有流量控制模块100。喷腔10为圆柱形。As shown in Figure 1, it is a switch flow control type droplet ejection device based on a magnetostrictive actuator, including a spray chamber 10 with a nozzle, a nozzle 203 connected to the nozzle of the spray chamber, and a liquid storage tank 12 connected to the spray chamber 10 , a compressed gas supply module 1 connected to the spray chamber 10 and the liquid storage tank 12 and a control system. A flow control module 100 is arranged in the spray chamber 10 . The spray chamber 10 is cylindrical.
压缩气体供应模块1的出口处设有总调压阀2，总调压阀2受控于控制系统。总调压阀2的出口连接有T型接头3，T型接头3的一端与总调压阀2的出口连接，T型接头3的另外两端分别与第一支路和第二支路连接，第一支路和第二支路分别与喷腔10和储液罐12连接，即第一支路与喷腔10连接，第二支路与储液罐12连接，第一支路上设有第一电磁阀5，第一支路上T型接头3与第一电磁阀5之间设有第一调压阀4，第二支路上设有第二电磁阀13，第一电磁阀5、第一调压阀4和第二电磁阀13受控于控制系统。第一支路上靠近喷腔上接有T型接头6，T型接头6的两端用于接通第一支路，T型接头6的第三端作为喷腔的排气口，连接有排气电磁阀7，排气电磁阀7受控于控制系统。储液罐12与喷腔10设有液体从储液罐12流向喷腔10的单向阀11，单向阀11受控于控制系统。The outlet of the compressed gas supply module 1 is provided with a main pressure regulating valve 2, and the main pressure regulating valve 2 is controlled by the control system. The outlet of the main pressure regulating valve 2 is connected with a T-shaped joint 3, one end of the T-shaped joint 3 is connected with the outlet of the main pressure regulating valve 2, and the other two ends of the T-shaped joint 3 are respectively connected with the first branch and the second branch , the first branch and the second branch are respectively connected with the spray chamber 10 and the liquid storage tank 12, that is, the first branch is connected with the spray chamber 10, the second branch is connected with the liquid storage tank 12, and the first branch is provided with The first solenoid valve 5, the first pressure regulating valve 4 is arranged between the T-shaped joint 3 and the first solenoid valve 5 on the first branch, the second solenoid valve 13 is arranged on the second branch, the first solenoid valve 5, the first solenoid valve 5 A pressure regulating valve 4 and a second solenoid valve 13 are controlled by the control system. On the first branch, there is a T-joint 6 close to the spray chamber. The two ends of the T-joint 6 are used to connect the first branch. The air solenoid valve 7 and the exhaust solenoid valve 7 are controlled by the control system. The liquid storage tank 12 and the spray chamber 10 are provided with a one-way valve 11 for liquid to flow from the liquid storage tank 12 to the spray chamber 10, and the one-way valve 11 is controlled by the control system.
喷腔10内设有与控制系统连接的液面检测模块，液面检测模块包括用于向喷腔10内液面发出信号的信号发射源8以及用于接收信号发射源8发出并经液面反射后的信号的信号接收端9。A liquid level detection module connected to the control system is provided in the spray chamber 10, and the liquid level detection module includes a signal emission source 8 for sending a signal to the liquid level in the spray chamber 10 and a signal emission source 8 for receiving a signal sent out by the liquid level. The signal receiving end 9 of the reflected signal.
压缩气体供应模块1可具体选用空气压缩机，通过空气压缩机产生压缩空气，经过总调压阀2的调压后，压缩空气通过T型接头3向第一调压阀4流动，经过第一调压阀4的再次调压后，达到要求的压缩空气通过第一电磁阀5，经T型接头6流入喷腔10，实现压缩空气的供应。在这一过程中，排气电磁阀7一直保持关闭状态。通过对第一调压阀4的调节，可以改变液滴喷射的结果。The compressed air supply module 1 can specifically select an air compressor to generate compressed air through the air compressor. After being regulated by the main pressure regulating valve 2, the compressed air flows to the first pressure regulating valve 4 through the T-shaped joint 3 and passes through the first pressure regulating valve 4. After the pressure regulating valve 4 is adjusted again, the required compressed air flows into the spray chamber 10 through the T-shaped joint 6 through the first solenoid valve 5 to realize the supply of compressed air. During this process, the exhaust solenoid valve 7 remains closed. By adjusting the first pressure regulating valve 4, the result of droplet ejection can be changed.
喷腔10内的液体供应，通过第二电磁阀13将由总调压阀2调节后的压缩空气通入储液罐12，推动储液罐12中的液体经单向阀11流入喷腔10，实现液体的供应。总调压阀2直接影响液体的供应速度。The liquid supply in the spray chamber 10 passes the compressed air regulated by the main pressure regulating valve 2 into the liquid storage tank 12 through the second solenoid valve 13, and pushes the liquid in the liquid storage tank 12 to flow into the spray chamber 10 through the one-way valve 11, Realize the supply of liquid. The total pressure regulating valve 2 directly affects the supply speed of the liquid.
排气模块采用排气电磁阀7，排气电磁阀7与T型接头6的一端相连，通过关闭第一电磁阀5，打开排气电磁阀7，在喷腔10内液体的供应下，喷腔10内的液面上升，把空气经排气电磁阀7排出去，实现液体的供应。The exhaust module adopts an exhaust solenoid valve 7, which is connected to one end of the T-shaped joint 6. By closing the first solenoid valve 5 and opening the exhaust solenoid valve 7, under the supply of liquid in the spray chamber 10, the spray The liquid level in the cavity 10 rises, and the air is discharged through the exhaust solenoid valve 7 to realize the supply of liquid.
第一电磁阀5、排气电磁阀7和第二电磁阀13都与控制系统中的阀控制模块相连，受阀控制模块的控制，在合适的时候开关电磁阀。The first electromagnetic valve 5 , the exhaust electromagnetic valve 7 and the second electromagnetic valve 13 are all connected to the valve control module in the control system, controlled by the valve control module, and switch the electromagnetic valves at an appropriate time.
液面检测模块用于检测喷腔10内液面高度，当一开始液面低时，信号发射源8发出信号，信号传播到液面上，经过液面反射之后，信号位于信号接收端9的下方，因此，接收不到信号，当液面上升到所设置的高度时，经过液面反射之后的信号到达信号接收端9，信号接收端9发数据给阀控制模块，在一段液面高度范围内，信号都能到达信号接收端9，当液面超过一定高度时，信号接收端9又接收不到信号。对于不同的液体，该模块都能检测液面的高度，实现相同的液面高度，液面检测模块与控制系统连接，液面检测模块检测的信号反馈给控制系统，控制系统根据该反馈的信号对第一电磁阀5、排气电磁阀7和第二电磁阀13、总调压阀2、第一调压阀4以及磁致伸缩执行器控制，对液体喷射过程进行控制。The liquid level detection module is used to detect the height of the liquid level in the spray chamber 10. When the liquid level is low at the beginning, the signal transmitting source 8 sends a signal, and the signal propagates to the liquid surface. After being reflected by the liquid surface, the signal is located at the signal receiving end 9 Below, therefore, no signal can be received. When the liquid level rises to the set height, the signal reflected by the liquid level reaches the signal receiving end 9, and the signal receiving end 9 sends data to the valve control module. Inside, the signal can reach the signal receiving end 9, and when the liquid level exceeds a certain height, the signal receiving end 9 cannot receive the signal again. For different liquids, the module can detect the height of the liquid level to achieve the same liquid level. The liquid level detection module is connected to the control system, and the signal detected by the liquid level detection module is fed back to the control system. The first solenoid valve 5, the exhaust solenoid valve 7, the second solenoid valve 13, the main pressure regulating valve 2, the first pressure regulating valve 4 and the magnetostrictive actuator are controlled to control the liquid injection process.
如图2和图3所示，流量控制模块100包括设置在喷腔10内的推杆105以及磁致伸缩执行器，推杆105的一端与喷腔喷口配合，该端部为倒截锥形，喷腔喷口也为倒截锥形，两者可以相互配合；推杆105的另一端通过磁致伸缩执行器驱动推杆轴向运动，该端部固定安装有磁致伸缩元件101。As shown in Figures 2 and 3, the flow control module 100 includes a push rod 105 and a magnetostrictive actuator arranged in the spray chamber 10, and one end of the push rod 105 is matched with the nozzle of the spray chamber, and the end is in the shape of an inverted truncated cone , The nozzle of the spray chamber is also in the shape of an inverted truncated cone, and the two can cooperate with each other; the other end of the push rod 105 drives the push rod to move axially through a magnetostrictive actuator, and the end is fixedly equipped with a magnetostrictive element 101 .
磁致伸缩执行器包括：磁致伸缩元件101、在磁致伸缩元件101两边对称布置的永久磁铁103以及在永久磁铁103的周围缠绕线圈102，线圈102通过导线与控制系统中的电流控制模块相连，磁致伸缩元件101的下端与推杆105相连，推杆105的下端为倒截锥形，容腔104将磁致伸缩元件101、永久磁铁103、线圈102和推杆105罩住，使流量控制模块100与喷腔10中的液体分离，只有推杆105的下端与液体接触，推杆105可相对容腔104上下滑动。The magnetostrictive actuator includes: a magnetostrictive element 101, a permanent magnet 103 arranged symmetrically on both sides of the magnetostrictive element 101, and a coil 102 wound around the permanent magnet 103, and the coil 102 is connected to the current control module in the control system through a wire , the lower end of the magnetostrictive element 101 is connected with the push rod 105, and the lower end of the push rod 105 is an inverted truncated cone, and the cavity 104 covers the magnetostrictive element 101, the permanent magnet 103, the coil 102 and the push rod 105, so that the flow The control module 100 is separated from the liquid in the spray chamber 10 , only the lower end of the push rod 105 is in contact with the liquid, and the push rod 105 can slide up and down relative to the cavity 104 .
如图1、图2和图3所示，磁致伸缩元件101可以是稀土超磁致伸缩元件，具有缩短的属性，其伸缩变形量大，频率响应快，稳定性好，可靠性高，其磁致伸缩性能不随时间而变化。初始时刻，推杆105的下端与喷腔10内壁圆锥面重合，当通过电流控制模块，经导线在线圈102上通以电流，会在线圈102周围产生一个磁场，在磁场的作用下，磁致伸缩元件101沿推杆105方向缩短，带动推杆105向上运动，使推杆105与喷腔10内壁之间产生间隙，从而使液体经间隙流向喷嘴203，当断开电流时，磁场不存在，磁致伸缩元件101恢复其原来的尺寸，带动推杆105向下运动，间隙消除，液体不再流向喷嘴203。通过控制电流的大小，可以控制间隙的大小，从而控制液体的流量，实现开关流量控制的目的。As shown in Fig. 1, Fig. 2 and Fig. 3, the magnetostrictive element 101 may be a rare earth giant magnetostrictive element, which has the property of shortening, and has a large amount of telescopic deformation, fast frequency response, good stability, and high reliability. Magnetostrictive properties do not change with time. At the initial moment, the lower end of the push rod 105 coincides with the conical surface of the inner wall of the spray chamber 10. When the current control module is passed through the wire and the current is passed through the coil 102, a magnetic field will be generated around the coil 102. Under the action of the magnetic field, the magnetism will The telescopic element 101 shortens along the direction of the push rod 105, and drives the push rod 105 to move upward, so that a gap is formed between the push rod 105 and the inner wall of the spray chamber 10, so that the liquid flows to the nozzle 203 through the gap. When the current is cut off, the magnetic field does not exist. The magnetostrictive element 101 restores its original size, drives the push rod 105 to move downward, the gap is eliminated, and the liquid no longer flows to the nozzle 203 . By controlling the size of the current, the size of the gap can be controlled, thereby controlling the flow of the liquid and realizing the purpose of on-off flow control.
如图2所示，喷嘴203与喷腔喷口螺纹连接，通过螺母201将喷嘴203螺纹连接在喷腔喷口上，即螺母201与喷腔10以螺纹配合同轴连接，将喷嘴203固定，喷嘴203与喷腔喷口之间设有密封圈202，在螺母201与喷腔10之间放有密封圈202，防止液体流出。独特的喷嘴模块设计，可以方便地更换喷嘴。As shown in Figure 2, the nozzle 203 is threadedly connected with the nozzle of the spray chamber, and the nozzle 203 is threadedly connected on the nozzle of the spray chamber by a nut 201, that is, the nut 201 and the spray chamber 10 are connected coaxially with threads, and the nozzle 203 is fixed, and the nozzle 203 A sealing ring 202 is arranged between the nozzle of the spray chamber and a sealing ring 202 is placed between the nut 201 and the spray chamber 10 to prevent liquid from flowing out. The unique nozzle module design allows easy replacement of nozzles.
本发明的液体供应过程如下：一开始当液面低时，信号接收端9接收不到信号，发数据给控制系统中的阀控制模块，阀控制模块通过处理后，发指令给第一电磁阀5，关闭第一电磁阀5的开口，阻止压缩空气进入喷腔10，然后阀控制模块发指令给排气电磁阀7，打开排气电磁阀7，最后阀控制模块发指令给第二电磁阀13，驱动第二电磁阀13工作，压缩气体通过第二电磁阀13进入储液罐12，推动储液罐12中的液体经过单向阀11流向喷腔10内部，使液面上升，喷腔10中的空气经排气电磁阀7排出。当信号接收端9接收到信号时，阀控制模块控制第二电磁阀13的开口减半，降低液体流入喷腔10的速度，但液面继续上升。当信号接收端9接收不到信号时，此时液面高度已达到要求，于是阀控制模块关闭第二电磁阀13，液面停止上升，当关闭排气电磁阀7，打开第一电磁阀5，压缩空气经过第一电磁阀5进入喷腔10，开始液滴喷射过程，液面开始下降。当信号接收端9经过先接收到信号，然后接收不到信号时，表明此时液面高度过低，于是控制系统中的电流控制模块停止液滴喷射过程，关闭第一电磁阀5，打开排气电磁阀7，最后打开第二电磁阀13，开始新一轮的液体供应过程，如此往复循环，使液面保持在一个期望的高度范围内。单向阀11能阻止液体从喷腔10流入储液罐12，实现有效的隔离。The liquid supply process of the present invention is as follows: at the beginning, when the liquid level is low, the signal receiving end 9 cannot receive the signal, and sends data to the valve control module in the control system, and the valve control module sends instructions to the first solenoid valve after processing 5. Close the opening of the first solenoid valve 5 to prevent compressed air from entering the spray chamber 10, and then the valve control module sends instructions to the exhaust solenoid valve 7 to open the exhaust solenoid valve 7, and finally the valve control module sends instructions to the second solenoid valve 13. Drive the second electromagnetic valve 13 to work, the compressed gas enters the liquid storage tank 12 through the second electromagnetic valve 13, and pushes the liquid in the liquid storage tank 12 to flow to the inside of the spray chamber 10 through the check valve 11, so that the liquid level rises and the spray chamber The air in 10 is discharged through exhaust solenoid valve 7. When the signal receiving end 9 receives the signal, the valve control module controls the opening of the second solenoid valve 13 to be halved, reducing the speed of liquid flowing into the spray chamber 10, but the liquid level continues to rise. When the signal receiving end 9 does not receive the signal, the liquid level has reached the requirement, so the valve control module closes the second solenoid valve 13, and the liquid level stops rising. When the exhaust solenoid valve 7 is closed, the first solenoid valve 5 is opened. , the compressed air enters the spray chamber 10 through the first solenoid valve 5, the droplet ejection process starts, and the liquid level begins to drop. When the signal receiving end 9 first receives the signal and then no signal, it indicates that the liquid level is too low at this time, so the current control module in the control system stops the droplet ejection process, closes the first solenoid valve 5, and opens the discharge valve. The air solenoid valve 7 finally opens the second solenoid valve 13 to start a new round of liquid supply process, so that the reciprocating cycle keeps the liquid level within a desired height range. The one-way valve 11 can prevent liquid from flowing into the liquid storage tank 12 from the spray chamber 10, so as to realize effective isolation.
本发明的液滴喷射过程如下：在经过液体供应过程之后，液面在指定的高度范围内，阀控制模块控制第一电磁阀5打开，压缩空气经T型接头6进入喷腔10，当流量控制模块100中的推杆105在电流控制模块的作用下向上运动时，液体在压缩空气的挤压作用下，经喷腔10内壁与推杆105之间的间隙流向喷嘴203，通过控制推杆105的上下运动，实现液滴的按需喷射。在这一过程中，第一电磁阀5一直打开，即压缩空气一直存在，避免了传统气压直接驱动中气体压力脉冲工作时间难以精确控制的问题。当在喷射过程中，液面高度低于设定值时，电流控制模块控制流量控制模块100中的推杆105恢复其初始位置，停止液滴喷射，然后开始液体供应过程，直到供应过程结束后，才重复前面的动作，开始继续喷射。整个装置可以在高温的环境下，长时间的持续工作，适用于喷射高粘度的液体，而且液滴喷射频率高，体积可控性高，一致性好。The droplet ejection process of the present invention is as follows: after the liquid supply process, the liquid level is within the specified height range, the valve control module controls the first electromagnetic valve 5 to open, compressed air enters the spray chamber 10 through the T-shaped joint 6, and when the flow rate When the push rod 105 in the control module 100 moves upward under the action of the current control module, the liquid will flow to the nozzle 203 through the gap between the inner wall of the spray chamber 10 and the push rod 105 under the extrusion of the compressed air, and the liquid will flow to the nozzle 203 through the control push rod 105. The up and down movement of 105 realizes the on-demand spraying of liquid droplets. During this process, the first electromagnetic valve 5 is always open, that is, the compressed air is always present, which avoids the problem that the working time of the gas pressure pulse in the traditional pneumatic direct drive is difficult to accurately control. When the liquid level is lower than the set value during the spraying process, the current control module controls the push rod 105 in the flow control module 100 to return to its initial position, stops the droplet spraying, and then starts the liquid supply process until the supply process ends , then repeat the previous action and start to continue spraying. The whole device can work continuously for a long time in a high-temperature environment, is suitable for spraying high-viscosity liquids, and has high droplet spraying frequency, high volume controllability, and good consistency.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148967.XACN103230849B (en) | 2013-04-25 | 2013-04-25 | A kind of switch flow control type droplet ejection device based on magnetostrictive actuator |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148967.XACN103230849B (en) | 2013-04-25 | 2013-04-25 | A kind of switch flow control type droplet ejection device based on magnetostrictive actuator |
| Publication Number | Publication Date |
|---|---|
| CN103230849A CN103230849A (en) | 2013-08-07 |
| CN103230849Btrue CN103230849B (en) | 2016-02-10 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310148967.XAActiveCN103230849B (en) | 2013-04-25 | 2013-04-25 | A kind of switch flow control type droplet ejection device based on magnetostrictive actuator |
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| CN (1) | CN103230849B (en) |
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