High-precision electromagnetic metering pump

Abstract

The high-precision electromagnetic metering pump comprises a pump body and a pump cavity, a liquid inlet channel and a liquid outlet channel which are in one-way circulation are formed in the two ends of the pump body respectively, a liquid inlet valve and a liquid outlet valve which are used for limiting backflow are correspondingly arranged in the liquid inlet channel and the liquid outlet channel respectively, and the closed pump cavity is formed in the pump body; the liquid inlet channel and the liquid outlet channel are both communicated with the pump cavity; the liquid inlet valve and the liquid outlet valve are arranged in opposite directions in the vertical direction, and both the liquid inlet valve and the liquid outlet valve are high-precision one-way valves; in the design, a liquid inlet process and a liquid outlet process are divided, and liquid enters and exits by controlling the volume change of a pump cavity; accurate change of the volume of the pump cavity is achieved by accurately controlling the movement of the leather tile, so that accurate metering of liquid is guaranteed, the application scene with the high-precision requirement is met, and it can be confirmed that the pump is more suitable for the small-flow and high-precision application scene after the steps of experiments, aging, sample machine sending to clients for verification and the like.

Description

Technical Field

[0001] The present invention relates to the technical field related to metering pumps, and in particular to a high-precision electromagnetic metering pump. Background Art

[0002] In the field of liquid metering and transportation, metering pumps are widely used because they can accurately control the liquid flow rate. Traditional metering pumps mostly use mechanical or pneumatic drive methods. Although these methods meet the metering needs to a certain extent, they often have problems such as complex structure and limited accuracy. Especially when it is necessary to handle high-viscosity liquids or require extremely high metering accuracy, the performance of traditional pumps seems to be inadequate.

[0003] With the development of electromagnetic technology, electromagnetic metering pumps have gradually attracted attention due to their simple structure, rapid response and advantages. However, the existing electromagnetic metering pumps still have shortcomings in structural design, such as the inflexible mechanism of pump chamber volume change, which makes it difficult to further improve metering accuracy and efficiency. In addition, some designs fail to effectively use electromagnetic force to directly drive the pump, but instead use an indirect transmission mechanism, which increases energy loss and failure points.

[0004] The one-way valve with the old duckbill valve structure is not suitable for use in scenarios with high flow accuracy / high reproducibility requirements. They will have unsatisfactory production process accuracy / low finished product yield, and qualified products will have excessive flow accuracy after being used for a period of time, thus affecting the authenticity of the test results. Summary of the invention

[0005] The object of the present invention is to provide a high-precision electromagnetic metering pump to overcome the deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A high-precision electromagnetic metering pump, characterized in that: A pump body and a pump cavity, wherein the two ends of the pump body are respectively provided with a one-way flow inlet channel and a liquid outlet channel, and the two are respectively provided with a limited position reflux inlet valve and a liquid outlet valve, and the pump body is provided with a closed pump cavity, and the inlet channel and the liquid outlet channel are both connected to the pump cavity; A driving mechanism, wherein the driving mechanism is located in the pump body, and the driving end of the driving mechanism is connected to a piston, and the piston constitutes the lower part of the pump chamber. Under the action of the driving mechanism, the piston moves closer or farther, so that the volume of the pump chamber changes to change the air pressure in the pump chamber; the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly; The liquid inlet valve and the liquid outlet valve are arranged in opposite directions in the vertical direction, and both the liquid inlet valve and the liquid outlet valve are high-precision one-way valves.

[0007] To further explain, the driving mechanism includes a coil, a fixed iron core and an armature, a support body placed along the axial direction thereof is fixedly provided in the pump body, the coil is wound around the outer end of the support body, the bottom end of the support body is provided with the fixed iron core fixedly connected to it, the fixed iron core and the coil are electrically connected so that the fixed iron core generates a magnetic force; an active cavity is also provided in the support body, a slidable armature is provided in the active cavity, and one end of the armature close to the pump body is connected to the piston, and under the action of the magnetic force of the fixed iron core, the piston moves close to the fixed iron core in the active cavity, so that the volume of the pump cavity changes to change the air pressure in the pump cavity, and the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly.

[0008] To further explain, the driving mechanism also includes: the return spring is located in the movable cavity, one end of the return spring is connected to the fixed iron core, and the other end is connected to the armature, so as to drive the armature to move away from the fixed iron core when the coil is powered off; so that the volume of the pump cavity changes to change the air pressure in the pump cavity, and the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly.

[0009] To further explain, the input end of the liquid inlet valve faces the outside world, and the output end thereof faces the pump body; the input end of the liquid outlet valve faces the pump body, and the output end thereof faces the outside world.

[0010] To further explain, the pump body is formed by connecting an upper cover body and a lower cover body, and the lower end of the upper cover body is recessed inward to form the upper part and the side wall part of the pump chamber, which cooperates with the leather shoe to form the pump chamber.

[0011] To further explain, a downwardly opening placement cavity is provided inside the armature, one end of the return spring is connected to the fixed iron core, and the other end passes through the placement cavity and is connected to the armature; a through threaded opening is provided on the lower end surface of the pump body, and a matching thread is provided on the outer side wall of the fixed iron core, and the fixed iron core and the threaded opening are threadedly connected.

[0012] To further explain, the one-way valve includes a valve body fixedly connected to the pump body, the valve body is a centrally through annular member, a plurality of annularly arranged valve flaps are fixedly provided inside the valve body, the ends of the valve flaps extend toward the center of the valve body, and a valve chip is fixedly connected to the end of the valve flap.

[0013] Further explained, a connecting wire harness extends from the pump body and forms an electrical connection with the coil.

[0014] To further explain, the liquid inlet channel is provided with a liquid inlet on the outer surface close to the pump body, and the liquid inlet is provided with a threaded end, which is threadedly connected to an external connecting mechanism; the liquid outlet channel is provided with a liquid outlet on the outer surface close to the pump body, and the liquid outlet is provided with the same threaded end, which is threadedly connected to an external connecting mechanism.

[0015] To further explain, there are at least three valve flaps, a sealing ring is fixedly arranged on the top of the valve chip, the valve flaps have elastic force, and the gaps between the valve flaps are arranged for gas or liquid to pass through.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In this design, there are two processes: liquid inlet and liquid outlet. 1. During the liquid inlet process, the driving mechanism drives the picowatt to move downward, the volume of the pump chamber increases, forming a negative pressure, the liquid inlet valve opens, the liquid outlet valve closes, and the liquid is sucked into the pump chamber through the liquid inlet channel; 2. During the liquid outlet process, the driving mechanism drives the picowatt to move upward in the opposite direction, the volume of the pump chamber decreases, the pressure increases, the liquid inlet valve closes, the liquid outlet valve opens, and the liquid is discharged through the liquid outlet channel. By precisely controlling the movement of the picowatt, the precise change of the pump chamber volume is achieved, thereby ensuring the precise measurement of the liquid and meeting the application scenarios with high-precision requirements. After experiments, aging, and sending prototypes to customers for verification, it can be confirmed that it is more suitable for small flow and high-precision usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural diagram of an electromagnetic metering pump provided in an embodiment of the present invention; Figure 2 A cross-sectional view of an electromagnetic metering pump provided by an embodiment of the present invention; Figure 3 A disassembly diagram of an electromagnetic metering pump provided in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the one-way valve in the present invention.

[0018] Description of main reference numerals: 100, pump body; 101, upper cover body; 102, lower cover body; 110, pump chamber; 120, liquid inlet channel; 130, liquid outlet channel; 140, liquid inlet valve; 150, liquid outlet valve; 160, valve body; 170, valve disc; 200, driving mechanism; 210, coil; 220, fixed iron core; 230, armature; 240, support body; 250, movable chamber; 260, reset spring; 270, picowatt; 180, valve chip; 190, sealing ring; 300, placement cavity; 310, threaded port; 320, connecting wire harness; 330, liquid inlet; 340, liquid outlet. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When the number of an element is referred to as "plurality", it may be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings: like Figure 1-4 As shown, the present invention provides a high-precision electromagnetic metering pump, including a pump body 100, a pump chamber 110 and a driving mechanism 200. The two ends of the pump body 100 are respectively provided with a one-way flow inlet channel 120 and a liquid outlet channel 130, and the two are respectively provided with a limited position reflux inlet valve 140 and a liquid outlet valve 150. The pump body 100 is provided with a closed pump chamber 110, and the inlet channel 120 and the liquid outlet channel 130 are both connected to the pump chamber 110. The driving mechanism 200 is located in the pump body 100, and the driving end of the driving mechanism 200 is connected to a pico-wafer 270, and the pico-wafer 270 constitutes the lower part of the pump chamber 110. Under the action of the driving mechanism 200, the pico-wafer 270 moves closer or farther, so that the volume of the pump chamber 110 changes to change the air pressure in the pump chamber 110, and the change in air pressure causes the inlet valve 140 and the liquid outlet valve 150 to open and close correspondingly.

[0023] Specifically, it is divided into two processes: liquid inlet and liquid outlet. 1. During the liquid inlet process, the driving mechanism 200 drives the picowatt 270 to move downward, the volume of the pump chamber 110 increases, a negative pressure is formed, the liquid inlet valve 140 opens, the liquid outlet valve 150 closes, and the liquid is sucked into the pump chamber 110 through the liquid inlet channel 120; 2. During the liquid outlet process, the driving mechanism 200 drives the picowatt 270 to move upward in the opposite direction, the volume of the pump chamber 110 decreases, the pressure increases, the liquid inlet valve 140 closes, the liquid outlet valve 150 opens, and the liquid is discharged through the liquid outlet channel 130. By precisely controlling the movement of the picowatt 270, the precise change of the volume of the pump chamber 110 is achieved, thereby ensuring the precise measurement of the liquid and meeting the application scenarios with high precision requirements.

[0024] In another embodiment of the invention, the driving mechanism 200 includes a coil 210, a fixed iron core 220 and an armature 230. A support body 240 is fixedly provided in the pump body 100 and is placed along its axial direction. The coil 210 is wound around the outer end of the support body 240. A fixed iron core 220 fixedly connected to the support body 240 is provided in the bottom end of the support body 240. The fixed iron core 220 and the coil 210 are electrically connected so that the fixed iron core 220 generates magnetic force. A movable cavity 250 is also provided in the support body 240. A slidable armature 230 is provided in the movable cavity 250. One end of the armature 230 close to the pump body 100 is connected to a spherical wall 270. Under the magnetic force of the fixed iron core 220, the spherical wall 270 moves close to the fixed iron core 220 in the movable cavity 250, so that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110. The change in air pressure causes the liquid inlet valve 140 and the liquid outlet valve 150 to open and close accordingly. The driving mechanism 200 further includes a return spring 260, which is located in the active chamber 250. One end of the return spring 260 is connected to the fixed iron core 220, and the other end is connected to the armature 230, so as to drive the armature 230 to move away from the fixed iron core 220 when the coil 210 is powered off. The volume of the pump chamber 110 changes to change the air pressure in the pump chamber 110, and the change in air pressure causes the liquid inlet valve 140 and the liquid outlet valve 150 to open and close accordingly. Specifically, 1. During the liquid inlet process, the coil 210 is energized, the fixed iron core 220 and the coil 210 directly form an electromagnet structure, the fixed iron core 220 has magnetic force, attracting the picowatt 270 connected to the armature 230 to move in the direction of the fixed iron core 220, the volume of the pump chamber 110 increases, a negative pressure is formed, the liquid inlet valve 140 opens, the liquid outlet valve 150 closes, and the liquid is sucked into the pump chamber 110 through the liquid inlet channel 120; 2. During the liquid outlet process, the coil 210 is powered off, the fixed iron core 220 loses its magnetic force, and the picowatt 270 connected to the armature 230 moves in a direction away from the fixed iron core 220 under the influence of the reset spring 260, the volume of the pump chamber 110 decreases, the pressure increases, the liquid inlet valve 140 closes, the liquid outlet valve 150 opens, and the liquid is discharged through the liquid outlet channel 130. The movement of the picowatt 270 is precisely controlled by the driving mechanism 200 of the electromagnet structure to achieve a precise change in the volume of the pump chamber 110. The liquid in the pump chamber 110 is discharged, and the liquid transportation is achieved through the above reciprocating working action.

[0025] In another embodiment of the invention, the inlet valve 140 and the outlet valve 150 are arranged in opposite directions in the vertical direction. The inlet valve 140 and the outlet valve 150 are both composed of high-precision one-way valves. The input end of the inlet valve 140 faces the outside world, and its output end faces the pump body 100. The input end of the outlet valve 150 faces the pump body 100, and its output end faces the outside world.

[0026] Specifically, the inlet valve 140 and the outlet valve 150 are made of high-quality imported materials. The new structure is a pressure-type sealing design, which avoids the limitation of sealing by relying on external air pressure, improves the efficiency of single opening and closing, and thus has higher precision; these one-way valves are composed of two main parts: a valve body 160 fixedly connected to the pump body and a valve flap 170 that can be elastically deformed. The gap between the valve flaps 170 is arranged to leave a gap for liquid or gas to flow through. The valve body 160 is a through-hole annular member, and a plurality of annularly arranged valve flaps 170 are fixedly disposed inside the valve body 160. The ends of the valve flaps 170 extend toward the center of the valve body, and a valve chip 180 is fixedly connected to the end of the valve flap 170. The valve chip 180 closes naturally when subjected to a reverse external force, and the valve flap 170 is always enabled on the valve chip 180, so that the valve chip 180 is tightly attached to the channel opening to form a seal; therefore, the valve chip 180 is not prone to accidental opening and leakage, thereby improving the accuracy of the pump, and a sealing ring 190 is fixedly disposed on the top of the valve chip 180 to improve the sealing performance. When subjected to a positive external force, the valve flap 170 will open to allow liquid to pass through. Specifically, the gap between the valve flaps 170 and the valve flaps 170 is arranged to facilitate the passage of gas or liquid.

[0027] Liquid suction process: As the piston 270 moves downward, the volume of the pump chamber 110 increases, forming a negative pressure. At this time, the valve flap 170 of the liquid inlet valve 140 is automatically opened by the positive action (the valve flap 170 undergoes elastic deformation, and the valve chip 180 will move away from the gap opened with the channel port, and the liquid will flow out through the gap and the gap between the valve flaps 170 and the valve flaps 170), allowing liquid to enter the pump chamber 110 from the outside. The valve chip 180 of the liquid outlet valve 150 is automatically closed by the reverse action, and liquid is not allowed to flow out of the pump chamber 110 to the outside.

[0028] 2. Liquid discharge process: As the piston 270 moves upward, the volume of the pump chamber 110 decreases, forming a positive pressure. At this time, the valve disc 170 of the liquid outlet valve 150 is automatically opened by the positive action (the valve disc 170 undergoes elastic deformation, and the valve chip 180 will move away from the gap opened with the channel port, and the liquid will flow out through the gap and the gap between the valve discs 170 and the valve discs 170), allowing the liquid to flow out of the pump chamber 110 to the outside, and the valve chip 180 of the liquid inlet valve 140 is automatically closed by the reverse action, and liquid is not allowed to enter the pump chamber 110 from the outside.

[0029] In another embodiment of the invention, the pump body 100 is formed by connecting an upper cover body 101 and a lower cover body 102. The lower end of the upper cover body 101 is recessed inward to form the upper part and side wall of the pump chamber 110, and cooperates with the piston 270 to form the pump chamber 110, thereby improving the airtightness of the pump chamber 110.

[0030] In another embodiment of the invention, a downwardly opening placement cavity 300 is provided inside the armature 230, one end of the return spring 260 is connected to the fixed iron core 220, and the other end passes through the placement cavity 300 and is connected to the armature 230, thereby improving the accuracy of the force of the return spring 260.

[0031] In another embodiment of the invention, the lower end surface of the pump body 100 is provided with a through threaded opening 310, and the outer side wall of the fixed core 220 is provided with a matching thread, and the fixed core 220 is threadedly connected to the threaded opening 310. Specifically, the threaded connection has good stability and convenience, and the fixed core 220 adopts a threaded structure for easy disassembly and later maintenance.

[0032] In another embodiment of the invention, a connecting wire harness 320 extends from the pump body 100 and forms an electrical connection with the coil 210 .

[0033] In another embodiment of the invention, a liquid inlet 330 is provided on the outer surface of the liquid inlet channel 120 close to the pump body 100, and a threaded end is provided on the liquid inlet 330, which is threadedly connected to an external connection mechanism; a liquid outlet 340 is provided on the outer surface of the liquid outlet channel 130 close to the pump body 100, and the same threaded end is provided on the liquid outlet 340, which is threadedly connected to an external connection mechanism. Specifically, the threaded connection has good stability and convenience, and the fixed iron core 220 adopts a threaded structure for easy disassembly and later maintenance.

[0034] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as within the scope of this specification. For ordinary technicians in this field, they can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A high-precision electromagnetic metering pump, characterized in that: include A pump body and a pump cavity, wherein the two ends of the pump body are respectively provided with a one-way flow inlet channel and a liquid outlet channel, and the two are respectively provided with a limited position reflux inlet valve and a liquid outlet valve, and the pump body is provided with a closed pump cavity, and the inlet channel and the liquid outlet channel are both connected to the pump cavity; A driving mechanism, wherein the driving mechanism is located in the pump body, and the driving end of the driving mechanism is connected to a piston, and the piston constitutes the lower part of the pump chamber. Under the action of the driving mechanism, the piston moves closer or farther, so that the volume of the pump chamber changes to change the air pressure in the pump chamber; the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly; The liquid inlet valve and the liquid outlet valve are arranged in opposite directions in the vertical direction, and both the liquid inlet valve and the liquid outlet valve are high-precision one-way valves.

2. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: The driving mechanism includes a coil, a fixed iron core and an armature. A support body placed along the axial direction is fixedly provided in the pump body, the coil is wound around the outer end of the support body, the fixed iron core fixedly connected to the support body is provided in the bottom end of the support body, the fixed iron core and the coil are electrically connected so that the fixed iron core generates magnetic force; an active cavity is also provided in the support body, a slidable armature is provided in the active cavity, and one end of the armature close to the pump body is connected to the piston, and under the action of the magnetic force of the fixed iron core, the piston moves in the active cavity close to the fixed iron core; The volume of the pump chamber changes to change the air pressure in the pump chamber, and the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly.

3. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: The driving mechanism further includes: the return spring is located in the movable cavity, one end of the return spring is connected to the fixed iron core, and the other end of the return spring is connected to the armature, so as to drive the armature to move away from the fixed iron core when the coil is powered off; The volume of the pump chamber changes to change the air pressure in the pump chamber, and the change in air pressure causes the liquid inlet valve and the liquid outlet valve to open and close accordingly.

4. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: The input end of the liquid inlet valve faces the outside, and the output end thereof faces the pump body; the input end of the liquid outlet valve faces the pump body, and the output end thereof faces the outside.

5. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: The pump body is formed by connecting an upper cover body and a lower cover body. The lower end of the upper cover body is recessed inward to form the upper part and the side wall of the pump chamber, and cooperates with the leather shoe to form the pump chamber.

6. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: A placement cavity opening downward is provided inside the armature, one end of the return spring is connected to the fixed iron core, and the other end passes through the placement cavity and is connected to the armature; a through threaded opening is provided on the lower end surface of the pump body, and a matching thread is provided on the outer side wall of the fixed iron core, and the fixed iron core is threadedly connected to the threaded opening.

7. A high-precision electromagnetic metering pump as claimed in claim 1, characterized in that: The one-way valve includes a valve body fixedly connected to the pump body, the valve body is a centrally-through annular member, a plurality of annularly-arranged valve flaps are fixedly provided inside the valve body, the ends of the valve flaps extend toward the center of the valve body, and a valve chip is fixedly connected to the end of the valve flap.

8. A high-precision electromagnetic metering pump as claimed in claim 2, characterized in that: A linking wire harness extends from the pump body and forms an electrical connection with the coil.

9. The electromagnetic metering pump according to claim 5, characterized in that: The liquid inlet channel is provided with a liquid inlet on the outer surface close to the pump body, and the liquid inlet is provided with a threaded end, which is threadedly connected to an external connecting mechanism; the liquid outlet channel is provided with a liquid outlet on the outer surface close to the pump body, and the liquid outlet is provided with the same threaded end, which is threadedly connected to an external connecting mechanism.

10. The electromagnetic metering pump according to claim 7, characterized in that: There are at least three valve flaps, a sealing ring is fixedly arranged on the top of the valve chip, the valve flap has elastic force, and the gap between the valve flaps is arranged for gas or liquid to pass through.

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