A continuous ultra-low flow filling device based on discrete metering

Abstract

The application discloses a kind of based on discrete metering continuous type extremely tiny flow filling device, belong to liquid filling equipment technical field, including truss module and multiple injection flow module, injection flow module contains constant-volume supply flow component and flow guide cylinder component, flow guide cylinder is fixed in shell, hollow piston with flow guide hole is built-in in flow guide cylinder, fluid variable discharge is realized, the end of flow guide cylinder is equipped with side cylinder body, it contains elastic corrosion-resistant diaphragm and the curved limiting surface that its deformation is limited, the application is realized parallel output and flexible expansion by multiple independent injection flow unit, in combination with fixed volume metering cavity and the timing control of intercepting valve, eliminate the flow drift caused by mechanical wear, ensure long-term high-precision filling, double-mode switching considers large-flow intermittent and non-pulsating continuous micro-flow demand, widen process adaptability, gas-driven corrosion-resistant diaphragm replaces mechanical contact, avoid corrosive medium damage, improve durability and safety, applicable to high-risk viscous liquid scene, effectively reduce operation and maintenance cost and safety risk.

Description

Technical Field

[0001] This invention belongs to the technical field of liquid dispensing equipment, specifically relating to a continuous micro-flow dispensing device based on discrete metering. Background Technology

[0002] Currently, industrial small-flow liquid metering systems are mainly completed by metering pumps. When injecting some high-risk, corrosive or viscous media, it is often necessary to prepare some diluent solvent. After the process is completed, the solvent needs to be recycled, which increases the complexity of the process and the investment in equipment. At the same time, it affects the quality of the process materials, thus increasing the project investment.

[0003] After long-term operation, existing metering pumps experience a gradual decline in filling accuracy due to increased frictional clearance in their reciprocating parts. This necessitates frequent maintenance and adjustments, impacting process stability. For high-risk, corrosive, or viscous media, solvent dilution and recovery are often required, increasing process complexity, equipment investment, and operating costs, and potentially affecting material quality. Furthermore, traditional metering pumps are mostly pulse-type or segmented outputs, making it difficult to achieve smooth, continuous, pulse-free output. This can easily lead to flow fluctuations that affect the process. For some scenarios, such as catalytic reactions with intense exothermic reactions requiring stable feed, it is difficult to meet the demand for high-precision continuous injection. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the embodiments of the present invention is to provide a subject to solve the problems in the background technology described above.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A continuous micro-flow injection device based on discrete metering includes a truss module and an injection module, wherein the truss module is provided with a plurality of injection modules. The injection module includes a constant volume flow supply component and a flow guide tube component; The constant volume flow supply assembly includes a housing, and the flow guide assembly includes a flow guide and a hollow piston. Several sets of the flow guides are fixedly installed on the housing. The hollow piston is slidably assembled inside the flow guide and a flow guide hole is provided in the middle of the hollow piston. The flow guide hole is used to quantitatively discharge the fluid in the flow guide cavity. One end of the guide tube is also provided with a side cylinder, and an elastic corrosion-resistant diaphragm is provided in the side cylinder. The corrosion-resistant diaphragm has a curved limiting surface on one side to limit its range of motion.

[0006] As a further embodiment of the present invention, the number of the guide tubes is not less than two sets.

[0007] As a further embodiment of the present invention, the constant volume flow supply assembly further includes an adjusting screw, a worm gear, a worm wheel, a lead screw, and a bracket. The adjusting screw is disposed in the inner cavity of the housing, and one end of the worm gear is fixedly connected to the adjusting screw. The worm gear is mounted on a fixed shaft in the housing, with one end of the worm gear meshing with the worm and the other end of the worm gear fixedly mounted with a lead screw. The guide rod is fixedly mounted in the housing, and one end of the bracket is slidably mounted on the guide rod, while the other end of the bracket meshes with the lead screw.

[0008] As a further embodiment of the present invention, the guide tube assembly further includes a top liquid level device and a bottom liquid level device. The top liquid level device is fixedly installed on one side of the shell of the guide tube, and the installation position of the top liquid level device is locked. The bottom liquid level device is arranged on one side of the hollow piston and located inside the cavity of the guide tube.

[0009] As a further embodiment of the present invention, the guide tube assembly further includes a supply pipe, a pre-stop valve, a feed pipe, a post-stop valve, and a main pipe. The supply pipe is arranged on one side of the guide tube and is located near the bottom of the cavity of the guide tube. The pre-stop valve is connected to the supply pipe. One end of the feed pipe is connected to the guide hole, and the other end of the feed pipe is connected to the main pipe. A post-stop valve is also installed on the feed pipe.

[0010] As a further embodiment of the present invention, the guide tube assembly further includes a curved limiting surface and a central flow hole. The side cylinder is provided with a curved limiting surface facing the inner cavity of the guide tube. The curved limiting surface has a hemispherical structure and a central flow hole is provided in the middle of the curved limiting surface. The central flow hole connects the cavities on both sides of the curved limiting surface.

[0011] As a further embodiment of the present invention, the guide tube assembly further includes a baffle, an air hole, an air supply pipe and an air source shut-off valve. The baffle is fixedly arranged in the inner cavity of the side cylinder and is planar. An air hole is arranged in the middle of the baffle and the air hole connects the cavities on both sides of the baffle. A corrosion-resistant diaphragm is arranged at the end of the air hole facing the curved limiting surface. The corrosion-resistant diaphragm is fixedly installed in the side cylinder and elastically fitted to one end of the air hole; One end of the gas supply pipe is connected to the side cylinder, and a gas source shut-off valve is also installed on the gas supply pipe.

[0012] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art: This invention integrates multiple independent injection units to achieve parallel output of various fluids or different flow rates, improving system scalability and process adaptability. The constant volume supply component and the guide tube component work together to construct a fixed volume metering chamber. Combined with the timing control of the pre- and post-stop valves, the volume of liquid discharged in a single operation is accurately locked, eliminating the flow drift problem caused by mechanical wear in traditional metering pumps and ensuring the filling accuracy under long-term operation. Furthermore, the device has two independent working modes: segmented injection and continuous injection. These modes can be flexibly switched to adapt to different flow requirements. The segmented mode relies on liquid level interlock control to achieve constant volume cyclic injection, while the continuous mode uses no less than two sets of guide tubes to alternately perform quantitative squeezing action, so that the output fluid is seamlessly connected on the time axis, forming a pulse-free and stable continuous microflow. This not only meets the requirements of large flow intermittent operation, but also maintains constant flow characteristics under extremely low flow conditions, greatly expanding the application range and process flexibility of a single device. Furthermore, the end of the guide tube is equipped with an elastic corrosion-resistant diaphragm and a hemispherical curved limiting surface. The air source pushes the diaphragm through the air supply pipe to generate controllable elastic deformation, thereby driving the fluid to be discharged quantitatively with a fixed deformation volume. This replaces the traditional mechanical pumping method, avoids direct contact between moving parts and corrosive or viscous media, improves the durability of the equipment and media compatibility, and is suitable for high-precision, long-term continuous filling scenarios of high-risk, corrosive or viscous liquids, effectively reducing operation and maintenance costs and safety risks. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of a constant volume flow supply component and a flow guide tube component in one embodiment of the present invention.

[0015] Figure 3 This is a partial structural schematic diagram of a constant volume flow supply component in one embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of a constant volume flow supply component in one embodiment of the present invention.

[0017] Figure 5 for Figure 4 Enlarged schematic diagram of reference numeral A in the attached figure.

[0018] Figure 6 This is a partial structural schematic diagram of the flow guide tube assembly in one embodiment of the present invention.

[0019] Figure 7 This is a side view of the flow guide tube assembly in one embodiment of the present invention.

[0020] Figure label: Stainless steel bracket; Constant volume flow supply assembly, 201-housing, 202-cover plate, 203-adjusting screw, 204-worm gear, 205-worm wheel, 206-lead screw, 207-guide rod, 208-bracket; Flow guide tube assembly, 301-flow guide tube, 302-connecting cover, 303-hollow piston, 304-flow guide hole, 305-top level gauge, 306-bottom level gauge, 307-supply pipe, 308-pre-positioned shut-off valve, 309-supply pipe, 310-rear shut-off valve, 311-main pipe, 312-side cylinder, 313-curved limiting surface, 314-central flow hole, 315-baffle, 316-air hole, 317-corrosion resistant diaphragm, 318-air supply pipe, 319-air source shut-off valve; Drain pipe; air delivery tube; Pressure transmitter; Glass rotor flow meter; 8-Gas source pressure regulating and filter dual unit. Detailed Implementation

[0021] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please see Figures 1-7 According to one embodiment of the present invention, a continuous micro-flow injection device based on discrete metering includes a truss module and an injection module. The truss module is provided with a plurality of injection modules. Each injection module includes a constant volume flow supply component 2 and a flow guide cylinder component 3. The constant volume flow supply component 2 includes a housing 201, and the flow guide cylinder component 3 includes a flow guide cylinder 301 and a hollow piston 303. A plurality of the flow guide cylinders 301 are fixedly installed on the housing 201. 3. The fluid is slidably assembled inside the guide cylinder 301, and the hollow piston 303 is provided with a guide hole 304 in the middle. The guide hole 304 is used to quantitatively discharge the fluid in the cavity of the guide cylinder 301. A side cylinder 312 is also provided at one end of the guide cylinder 301. An elastic corrosion-resistant diaphragm 317 is provided in the side cylinder 312, and a curved limiting surface 313 is provided on one side of the corrosion-resistant diaphragm 317 to limit its range of motion. The number of guide cylinders 301 is not less than two sets.

[0023] In practical application, the main structure of this embodiment includes a truss module and a flow injection module. The truss module includes a stainless steel support 1. Several sets of constant volume flow supply components 2, a drain pipe 4, a gas guide pipe 5, a pressure transmitter 6, a glass rotor flow meter 7, and a gas source pressure regulating and filtering dual unit 8 are arranged on the stainless steel support 1. The constant volume flow supply component 2 further includes a housing 201. Cover plates 202 are fixedly sealed at both ends of the housing 201. Several flow guide cylinders 301 are also arranged on one side end face of the housing 201. Each flow guide cylinder 301 is fixedly locked to the housing 201 by a connecting cover 302. A hollow piston 303 is slidably installed inside the flow guide cylinder 301 along its axial direction. A flow guide hole 304 is opened in the middle of the hollow piston 303. The flow guide hole 304 is set as the outlet of the fluid in the micro-flow injection device. On the set of stainless steel brackets 1, there are several independent liquid injection units, and the number of liquid injection units is not less than two. The liquid injection units can be used for independent output of different types of fluid materials and materials with different flow rates. Each liquid injection unit includes a constant volume flow supply component 2, a drain pipe 4, a gas guide pipe 5, a pressure transmitter 6, a glass rotor flow meter 7, and a gas source pressure regulating and filtering unit 8. The gas source is transported to the top of the pressure storage and stabilizing filling tank after passing through the gas source pressure regulating and filtering unit 8 and the gas guide pipe 5. The fluid material in the tank is pressed into the guide cylinder 301 by the gas pressure in the tank. The constant volume flow supply component 2 is set at the end of the pipeline of the glass rotor flow meter 7. The glass rotor flow meter 7 is used as a pre-structure to deliver a specific fluid to the constant volume flow supply component 2. The pressure transmitter 6 is used to measure the pressure in the tank. This micro-flow filling device has two relatively independent and selectable working states: segmented flow mode and continuous flow mode. When the device is in segmented flow mode, the fluid enters the inner cavity of the guide cylinder 301 through the pressure storage and stabilizing filling tank. At this time, the filling liquid 1 is forced into the interior of the guide cylinder 301 from the top of the storage tank by compressed gas. A post-stop valve 310 is provided at the bottom outlet of the guide cylinder 301. The post-stop valve 310 and the liquid level detected by the top liquid level sensor 305 inside the guide cylinder 301 for constant volume measurement form an interlocking control relationship. When the top liquid level sensor 305 detects that the liquid level has reached the preset high point setting value, the system cuts off the feed. When the filling liquid flows out from the outlet and the liquid level drops to the preset low point setting value, the system first cuts off the discharge action of the post-stop valve 310, and then reopens the feed channel, thereby realizing one constant volume filling cycle of the filling liquid. When the micro-flow dispensing device is in continuous dispensing mode, the post-stop valve 310 on the feed pipe 309 connected to one side of the guide tube 301 is closed, while the feed channel on one side of the guide tube 301 remains open, so that the inner cavity of the guide tube 301 is completely filled with dispensing liquid. In this state, the level gauges at different heights are completely submerged in the dispensing liquid. After the inner cavity of the guide tube 301 is filled with dispensing liquid, the feed port on one side of the guide tube 301 is closed, while the feed pipe 309 is opened. Under atmospheric pressure, the fluid inside the guide tube 301 cannot flow directly from the guide tube 301. The liquid flows out from the middle. At this time, the corrosion-resistant diaphragm 317 arranged on one side of the side cylinder 312 moves. Under the action of gas pressure, the corrosion-resistant diaphragm 317 undergoes elastic deformation and gradually adheres to one side of the curved limiting surface 313. This causes the liquid in the cavity connected to the curved limiting surface 313 and the guide cylinder 301 to be squeezed into the inner cavity of the guide cylinder 301. This causes the excess liquid inside the guide cylinder 301 to be discharged from the feed pipe 309. Since the deformation volume of the corrosion-resistant diaphragm 317 is fixed, the volume of liquid discharged each time is also a fixed value, thereby achieving quantitative liquid discharge. Furthermore, the injection module includes no less than two sets of guide tubes 301. In continuous injection mode, the injection fluid in the two sets of guide tubes 301 is delivered alternately. That is, after the first set of guide tubes 301 completes the quantitative discharge process driven by the corrosion-resistant diaphragm 317, the second set of guide tubes 301 immediately begins to perform the same quantitative discharge process. The two sets of guide tubes 301 are connected to each other and work alternately, so that the entire injection process is a continuous, pulse-free fluid output, thereby realizing the continuous micro-flow injection function based on the discrete metering principle.

[0024] Please see Figure 4 In a preferred embodiment of the present invention, the constant volume flow supply assembly 2 further includes an adjusting screw 203, a worm 204, a worm wheel 205, a lead screw 206, and a bracket 208. The adjusting screw 203 is disposed in the inner cavity of the housing 201, and one end of the worm 204 is fixedly connected to the adjusting screw 203. The worm wheel 205 is fixedly mounted in the housing 201, and one end of the worm wheel 205 is meshed with the worm 204. The other end of the worm wheel 205 is fixedly mounted with the lead screw 206. The guide rod 207 is fixedly mounted in the housing 201. One end of the bracket 208 is slidably mounted on the guide rod 207, and the other end of the bracket 208 is meshed with the lead screw 206.

[0025] In practical application, the adjusting screw 203 is located inside the housing 201. The adjusting screw 203 is fixedly connected to one end of the worm gear 204. The worm wheel 205 is fixedly mounted inside the housing 201, rotating around its own axis. One end of the worm wheel 205 meshes with the worm gear 204, forming a one-way transmission pair. A lead screw 206 is fixedly mounted on the other end of the worm wheel 205. The lead screw 206 is coaxial with the worm wheel 205 and can rotate with it. A guide rod 207 is fixedly mounted inside the housing 201. The axial direction of the guide rod 207 is parallel to the axial direction of the lead screw 206. One end of the bracket 208 is slidably mounted on the guide rod 207, allowing the bracket 208 to reciprocate linearly along the axial direction of the guide rod 207. The other end of 208 is engaged with the lead screw 206, forming a lead screw and nut transmission pair. When the manually rotating adjusting screw 203 rotates, the worm 204 drives the worm wheel 205, which is engaged with it, to rotate. The worm wheel 205 drives the lead screw 206, which is fixedly connected to its end, to rotate synchronously. The lead screw 206 drives the support 208 to make directional axial displacement along the axis of the lead screw 206 through its meshing relationship with the support 208. During the movement, the support 208 is simultaneously guided and supported by the guide rod 207. The support 208 is fixedly connected to the hollow piston 303. When the support 208 moves axially, it drives the hollow piston 303 to make synchronous axial extension and retraction relative to the axis of the guide tube 301, thereby realizing the control of the axial position of the hollow piston 303 inside the guide tube 301.

[0026] Furthermore, by utilizing the unidirectional transmission between the worm 204 and the worm wheel 205, the worm wheel 205 can be automatically locked in the non-adjusted state.

[0027] Please see Figure 5 In a preferred embodiment of the present invention, the guide tube assembly 3 further includes a top liquid level device 305 and a bottom liquid level device 306. The top liquid level device 305 is fixedly installed on one side of the housing of the guide tube 301, and the installation position of the top liquid level device 305 is locked. The bottom liquid level device 306 is arranged on one side of the hollow piston 303 and located in the cavity of the guide tube 301.

[0028] In practical application, the top-mounted level sensor 305 is fixedly installed on one side of the housing of the guide tube 301. The installation position of the top-mounted level sensor 305 is locked and remains unchanged relative to the guide tube 301. The bottom-mounted level sensor 306 is arranged on one side of the hollow piston 303 and is located inside the cavity of the guide tube 301. The bottom-mounted level sensor 306 is fixedly connected to the hollow piston 303. The installation position of the bottom-mounted level sensor 306 can move synchronously with the reciprocating movement of the hollow piston 303. The spatial position of the top-mounted level sensor 305 remains fixed, while the spatial position of the bottom-mounted level sensor 306 moves synchronously with the reciprocating movement of the hollow piston 303. The position of the bottom level sensor 306 changes as the hollow piston 303 moves away from the hollow piston 303. When the bottom level sensor 306 moves away from the hollow piston 303, the linear distance between the bottom level sensor 306 and the top level sensor 305 increases. This increase in relative distance leads to a corresponding increase in the quantitative volume defined between the top level sensor 305 and the bottom level sensor 306. Conversely, when the bottom level sensor 306 moves closer to the hollow piston 303, the linear distance between the bottom level sensor 306 and the top level sensor 305 decreases. This decrease in relative distance leads to a corresponding decrease in the quantitative volume defined between the top level sensor 305 and the bottom level sensor 306.

[0029] Please see Figure 5 and Figure 6 In a preferred embodiment of this embodiment, the guide tube assembly 3 further includes a supply pipe 307, a pre-stop valve 308, a feed pipe 309, a post-stop valve 310, and a main pipe 311. The supply pipe 307 is arranged on one side of the guide tube 301 and is located near the bottom of the cavity of the guide tube 301. The pre-stop valve 308 is connected to the supply pipe 307. One end of the feed pipe 309 is connected to the guide hole 304, and the end of the feed pipe 309 is connected to the main pipe 311. The post-stop valve 310 is also arranged on the feed pipe 309.

[0030] In practical application, the supply pipe 307 is positioned on one side of the guide cylinder 301, and is arranged near the bottom of the guide cylinder 301. The position of the supply pipe 307 is always higher than the position of the guide hole 304. The supply pipe 307 is used to input the filling fluid into the guide cylinder 301. A pre-stop valve 308 is installed on the supply pipe 307 in a connected manner. The pre-stop valve 308 is used to regulate the flow or cut-off state of the filling fluid inside the supply pipe 307. One end of the supply pipe 309 is connected to the guide hole 304 on the guide cylinder 301, and the other end of the supply pipe 309 is connected to the main pipe 311. A post-stop valve 310 is also arranged on the supply pipe 309. The post-stop valve 310 is used to control the flow or stop state of the liquid inside the supply pipe 309. The position of the supply pipe 307 is always higher than the position of the guide hole 304, thus forming a high position arrangement relationship between the supply pipe 307 and the guide hole 304 in space. The supply pipe 307 is specifically used to input the filling liquid into the guide tube 301. The pre-stop valve 308 is used to control the movement state of the fluid inside the supply pipe 307, and the post-stop valve 310 is used to control the movement state of the fluid inside the supply pipe 309. The pre-stop valve 308 and the post-stop valve 310 work independently to adjust the opening and closing and flow rate of the liquid in the supply pipe 307 and the supply pipe 309, respectively.

[0031] Please see Figure 7 In a preferred embodiment of the present invention, the guide tube assembly 3 further includes a curved limiting surface 313 and a central flow hole 314. The side cylinder 312 is provided with the curved limiting surface 313 facing the inner cavity of the guide tube 301. The curved limiting surface 313 has a hemispherical structure, and a central flow hole 314 is provided in the middle of the curved limiting surface 313. The central flow hole 314 connects the cavities on both sides of the curved limiting surface 313. The guide tube assembly 3 also includes a baffle 315, an air hole 316, an air supply pipe 318, and an air source shut-off valve 319. The baffle 315 is fixedly arranged in the inner cavity of the side cylinder 312, and the baffle 315 is planar. The baffle 315 has an air hole 316 in the middle, which connects the cavities on both sides of the baffle 315. A corrosion-resistant diaphragm 317 is arranged at the end of the air hole 316 facing the curved limiting surface 313. The corrosion-resistant diaphragm 317 is fixedly installed in the side cylinder 312 and elastically fits one end of the air hole 316. One end of the air supply pipe 318 is connected to the side cylinder 312, and an air source shut-off valve 319 is also provided on the air supply pipe 318.

[0032] In practical application, the side cylinder 312 has a curved limiting surface 313 on the side surface facing the inner cavity of the guide tube 301. This curved limiting surface 313 has a hemispherical structure, and a central flow hole 314 is provided at the geometric center of the curved limiting surface 313. The central flow hole 314 penetrates the curved limiting surface 313 and maintains communication with the cavities on both sides. The internal space of the guide tube 301 is divided into multiple chambers, with one side region of the guide tube 301 designated as the first cavity a1. The area between the limiting surface 313 and the baffle 315 is designated as the second cavity a2, and the area on the other side of the baffle 315 relative to the curved limiting surface 313 is designated as the third cavity a3. When the rear shut-off valve 310 located on one side of the first cavity a1 is closed, and the front shut-off valve 308 is open, the injection fluid enters through the front shut-off valve 308 and fills the entire first cavity a1. At this time, the corrosion-resistant diaphragm 317 is pressed tightly against one side surface of the baffle 315 by the push of the injection fluid. When the shut-off valve 310 is switched to the open state and the pre-shut-off valve 308 is switched to the closed state, the gas source shut-off valve 319 connected to the gas supply pipe 318 is switched to the open state. The external gas source continuously supplies gas into the third cavity a3 through the gas supply pipe 318. The gas enters the tiny gap between the corrosion-resistant diaphragm 317 and the vent 316 through the vent 316 opened on the baffle 315, and under the action of air pressure, drives the corrosion-resistant diaphragm 317 to undergo elastic deformation. During the continuous deformation process, the injection fluid in the second cavity a2 is gradually squeezed and flows into the first cavity a1 through the central flow hole 314 and the curved limiting surface 313, thereby pushing the metered injection fluid in the first cavity a1 into the flow supply pipe 309 to achieve micro-output. This working mode is suitable for application scenarios with high flow accuracy requirements and need to achieve continuous delivery of extremely small flow rates. Compared with the above continuous delivery mode, the segmented injection mode is suitable for fluid delivery conditions with large flow requirements and no need for continuous delivery function.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous micro-flow dispensing device based on discrete metering, characterized in that, include: Truss module and injection module, wherein the truss module is provided with a plurality of injection modules; The injection module includes a constant volume flow supply component and a flow guide tube component; The constant volume flow supply assembly includes a housing, and the flow guide assembly includes a flow guide and a hollow piston. Several sets of the flow guides are fixedly installed on the housing. The hollow piston is slidably assembled inside the flow guide and a flow guide hole is provided in the middle of the hollow piston. The flow guide hole is used to quantitatively discharge the fluid in the flow guide cavity. One end of the guide tube is also provided with a side cylinder, and an elastic corrosion-resistant diaphragm is provided in the side cylinder. The corrosion-resistant diaphragm has a curved limiting surface on one side to limit its range of motion.

2. The continuous micro-flow dispensing device based on discrete metering according to claim 1, characterized in that, The number of guide tubes deployed shall not be less than two sets.

3. The continuous micro-flow dispensing device based on discrete metering according to claim 1, characterized in that, The constant volume flow supply assembly also includes an adjusting screw, a worm gear, a worm wheel, a lead screw, and a bracket. The adjusting screw is located in the inner cavity of the housing, and one end of the worm gear is fixedly connected to the adjusting screw. The worm gear is mounted on a fixed shaft in the housing, with one end of the worm gear meshing with the worm and the other end of the worm gear fixedly mounted with a lead screw. The guide rod is fixedly mounted in the housing, and one end of the bracket is slidably mounted on the guide rod, while the other end of the bracket meshes with the lead screw.

4. The continuous micro-flow dispensing device based on discrete metering according to claim 1, characterized in that, The guide tube assembly also includes a top liquid level sensor and a bottom liquid level sensor. The top liquid level sensor is fixedly installed on one side of the shell of the guide tube, and the installation position of the top liquid level sensor is locked. The bottom liquid level sensor is arranged on one side of the hollow piston and located inside the cavity of the guide tube.

5. A continuous micro-flow dispensing device based on discrete metering according to claim 1, characterized in that, The flow guide tube assembly also includes a flow supply pipe, a pre-stop valve, a feed pipe, a post-stop valve, and a main pipe. The flow supply pipe is located on one side of the flow guide tube and is positioned near the bottom of the cavity of the flow guide tube. The pre-stop valve is connected to the flow supply pipe. One end of the feed pipe is connected to the guide hole, and the other end of the feed pipe is connected to the main pipe. A post-stop valve is also installed on the feed pipe.

6. The continuous micro-flow dispensing device based on discrete metering according to claim 1, characterized in that, The guide tube assembly also includes a curved limiting surface and a central flow hole. The side cylinder is provided with a curved limiting surface facing the inner cavity of the guide tube. The curved limiting surface has a hemispherical structure and a central flow hole is provided in the middle of the curved limiting surface. The central flow hole connects the cavities on both sides of the curved limiting surface.

7. A continuous micro-flow dispensing device based on discrete metering according to claim 6, characterized in that, The guide tube assembly also includes a baffle, an air hole, an air supply pipe and an air source shut-off valve. The baffle is fixedly arranged in the inner cavity of the side cylinder and is planar. An air hole is arranged in the middle of the baffle and the air hole connects the cavities on both sides of the baffle. A corrosion-resistant diaphragm is arranged at the end of the air hole facing the curved limiting surface. The corrosion-resistant diaphragm is fixedly installed in the side cylinder and elastically fitted to one end of the air hole; One end of the gas supply pipe is connected to the side cylinder, and a gas source shut-off valve is also installed on the gas supply pipe.

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