A high-precision electromagnetic metering pump

Abstract

The application discloses a high-precision electromagnetic metering pump, which comprises a pump body and a pump cavity. The pump body is provided with a one-way liquid inlet channel and a one-way liquid outlet channel at two ends respectively. The liquid inlet channel and the liquid outlet channel are respectively provided with a liquid inlet valve and a liquid outlet valve. The pump body is provided with a sealed pump cavity. The liquid inlet channel and the liquid outlet channel are communicated with the pump cavity. The liquid inlet valve and the liquid outlet valve are arranged in opposite directions in the vertical direction. The liquid inlet valve and the liquid outlet valve are high-precision one-way valves. In the design, the process is divided into two processes, namely, liquid inlet and liquid outlet. The volume change of the pump cavity is controlled to make the liquid inlet and outlet. The accurate change of the pump cavity volume is realized by accurately controlling the movement of the skin, so as to ensure the accurate measurement of the liquid and meet the application scene with high-precision requirement. After the steps of experiment, aging and customer sample verification, it is confirmed that the application is more suitable for the application scene with small flow and high precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metering pump, and particularly relates to a high-precision electromagnetic metering pump. BACKGROUND

[0002] In the field of liquid metering and conveying, metering pumps are widely used because they can accurately control the flow of liquid. The traditional metering pumps are mostly driven by mechanical or pneumatic methods. These methods can meet the metering requirements to some extent, but they often have problems such as complex structure and limited precision. Especially when high-viscosity liquids need to be handled or extremely high metering precision is required, the performance of the traditional pumps is not satisfactory.

[0003] With the development of electromagnetic technology, electromagnetic metering pumps have gradually attracted attention because of their simple structure, rapid response and other advantages. However, the existing electromagnetic metering pumps still have some deficiencies in structural design, such as the mechanism of pump cavity volume change is not flexible enough, which makes it difficult to further improve the metering precision and efficiency. In addition, some designs do not effectively utilize the electromagnetic force to directly drive the pump operation, but use indirect transmission mechanisms, which increases energy loss and failure points.

[0004] The old duckbill valve structure of the one-way valve is not suitable for use in this high flow precision / high repeatability precision requirement scenario. They may not meet the production process precision / low good product yield, and the qualified products may have flow precision that exceeds the tolerance after being used for a period of time, thereby affecting the authenticity of the test results. SUMMARY

[0005] The present application aims to provide a high-precision electromagnetic metering pump to overcome the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A high-precision electromagnetic metering pump, characterized in that it comprises

[0008] a pump body and a pump cavity, the pump body is provided with a liquid inlet channel and a liquid outlet channel at both ends respectively, the liquid inlet channel and the liquid outlet channel are respectively provided with a liquid inlet valve and a liquid outlet valve corresponding to the limit backflow, the pump body is provided with a sealed pump cavity, and the liquid inlet channel and the liquid outlet channel are in communication with the pump cavity;

[0009] a driving mechanism, the driving mechanism is located in the pump body, and the driving end of the driving mechanism is connected with a skin tile, the skin tile constitutes the lower part of the pump cavity, and the skin tile moves close to or away from under the action of the driving mechanism, so that the volume of the pump cavity changes to change the air pressure in the pump cavity; the air pressure change makes the liquid inlet valve and the liquid outlet valve correspondingly open and close;

[0010] The inlet valve and the outlet valve are oppositely arranged in the vertical direction, and the inlet valve and the outlet valve are both high-precision one-way valves.

[0011] Further, the driving mechanism comprises a coil, a fixed core and an armature, the pump body is internally fixed with a support body arranged along the axial direction thereof, the coil is wound around the outer end of the support body, the bottom end of the support body is internally provided with the fixed core fixedly connected thereto, and the fixed core is electrically connected with the coil to generate a magnetic force.

[0012] Further, the driving mechanism further comprises a reset spring located in the movable cavity, one end of the reset spring is connected with the fixed core, and the other end of the reset spring is connected with the armature, so that the armature is driven to move away from the fixed core when the coil is powered off.

[0013] Further, the input end of the inlet valve faces the outside world, and the output end of the inlet valve faces the pump body; the input end of the outlet valve faces the pump body, and the output end of the outlet valve faces the outside world.

[0014] Further, 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 inwardly recessed to form an upper part and a side wall part of the pump cavity, and the pump cavity is formed in cooperation with the puffer.

[0015] Further, the armature is internally provided with a downwardly-opened placement cavity, one end of the reset spring is connected with the fixed core, and the other end of the reset spring passes through the placement cavity and is connected with the armature; the lower end surface of the pump body is provided with a threaded port penetrating therethrough, the outer side wall of the fixed core is provided with a matched thread, and the fixed core is threadedly connected with the threaded port.

[0016] Further, the one-way valve comprises a valve body fixedly connected with the pump body, the valve body is a ring-shaped member with a through hole, a plurality of valve petals are fixedly arranged in the valve body in a ring shape, the distal ends of the valve petals extend towards the center of the valve body, and valve core pieces are fixedly connected to the distal ends of the valve petals.

[0017] Further, a link harness extends from the pump body and is electrically connected with the coil.

[0018] To further elaborate, the inlet channel is provided with an inlet port on the outer surface near the pump body, and the inlet port is provided with a threaded end for threaded connection with an external connecting mechanism; the outlet channel is provided with an outlet port on the outer surface near the pump body, and the outlet port is provided with the same threaded end for threaded connection with an external connecting mechanism.

[0019] To elaborate further, there are at least three valve discs, a sealing ring is fixedly installed on the top of the valve chip, the valve discs are elastic, and the gaps between the valve discs are arranged to allow gas or liquid to pass through.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This design consists of two processes: liquid inlet and liquid outlet. 1. During liquid inlet, the drive mechanism drives the piston to move downwards, increasing the pump chamber volume and creating negative pressure. The inlet valve opens, and the outlet valve closes, allowing liquid to be drawn into the pump chamber through the inlet channel. 2. During liquid outlet, the drive mechanism drives the piston to move upwards in the opposite direction, decreasing the pump chamber volume and increasing the pressure. The inlet valve closes, and the outlet valve opens, allowing liquid to be discharged through the outlet channel. By precisely controlling the movement of the piston, accurate changes in the pump chamber volume are achieved, ensuring precise liquid metering and meeting the requirements of high-precision applications. After testing, aging, and verification with customer prototypes, it has been confirmed that this design is more suitable for low-flow, high-precision applications. Attached Figure Description

[0022] Figure 1 This is a structural diagram of an electromagnetic metering pump provided in an embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of an electromagnetic metering pump provided in an embodiment of the present invention;

[0024] Figure 3 This is a disassembly diagram of an electromagnetic metering pump provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the one-way valve in this invention.

[0026] Explanation of key figure labels:

[0027] 100. Pump body; 101. Upper cover; 102. Lower cover; 110. Pump chamber; 120. Inlet channel; 130. Outlet channel; 140. Inlet valve; 150. Outlet valve; 160. Valve body; 170. Valve disc; 200. Drive mechanism; 210. Coil; 220. Fixed iron core; 230. Armature; 240. Support body; 250. Movable chamber; 260. Return spring; 270. Pipe; 180. Valve chip; 190. Sealing ring;

[0028] 300, placement cavity; 310, threaded opening; 320, connecting wire harness; 330, liquid inlet; 340, liquid outlet. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0033] like Figures 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 drive mechanism 200. The pump body 100 has a unidirectional inlet channel 120 and an outlet channel 130 at both ends, with a limit-return inlet valve 140 and an outlet valve 150 respectively installed within each. The pump body 100 contains a sealed pump chamber 110, and both the inlet channel 120 and the outlet channel 130 are connected to the pump chamber 110. The drive mechanism 200 is located inside the pump body 100, and its drive end is connected to a bearing 270, which forms the lower part of the pump chamber 110. Under the action of the drive mechanism 200, the bearing 270 moves closer or further away, causing a change in the volume of the pump chamber 110 to alter the air pressure within it. This change in air pressure causes the inlet valve 140 and the outlet valve 150 to open and close accordingly.

[0034] Specifically, it is divided into two processes of liquid inlet and liquid outlet. In the liquid inlet process, the driving mechanism 200 drives the leather tile 270 to move downward, the pump cavity 110 increases in volume, negative pressure is formed, the liquid inlet valve 140 is opened, the liquid outlet valve 150 is closed, and the liquid is sucked into the pump cavity 110 through the liquid inlet channel 120; in the liquid outlet process, the driving mechanism 200 drives the leather tile 270 to move upward in the reverse direction, the pump cavity 110 decreases in volume, the pressure rises, the liquid inlet valve 140 is closed, the liquid outlet valve 150 is opened, and the liquid is discharged through the liquid outlet channel 130. By accurately controlling the movement of the leather tile 270, the accurate change of the volume of the pump cavity 110 is realized, so as to ensure the accurate metering of the liquid and meet the application scenarios with high precision requirements.

[0035] In another embodiment of the application, the driving mechanism 200 comprises a coil 210, a fixed core 220 and an armature 230, a support 240 is fixedly arranged in the pump body 100 along the axial direction of the pump body 100, the coil 210 is wound around the outer end of the support 240, the bottom end of the support 240 is provided with the fixed core 220 fixedly connected thereto, and the fixed core 220 is electrically connected with the coil 210 to generate a magnetic force. The support 240 is further provided with a movable cavity 250, the movable cavity 250 is provided with the armature 230 which is slidable, and the end of the armature 230 close to the pump body 100 is connected with a pia 270, the pia 270 is driven by the magnetic force of the fixed core 220 to move in the movable cavity 250 to approach the fixed core 220; so that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110, and the air pressure change causes the inlet valve 140 and the outlet valve 150 to correspondingly open and close. The driving mechanism 200 further comprises a return spring 260, the return spring 260 is located in the movable cavity 250, one end of the return spring 260 is connected with the fixed core 220, and the other end of the return spring 260 is connected with the armature 230, so that the armature 230 is driven to move away from the fixed core 220 when the coil 210 is powered off. So that the volume of the pump cavity 110 changes to change the air pressure in the pump cavity 110, and the air pressure change causes the inlet valve 140 and the outlet valve 150 to correspondingly open and close. Specifically, 1, during the liquid inlet process, the coil 210 is powered on, the fixed core 220 and the coil 210 directly form an electromagnet structure, the fixed core 220 has a magnetic force, the pia 270 connected with the armature 230 is driven to move towards the fixed core 220, the volume of the pump cavity 110 increases, a negative pressure is formed, the inlet valve 140 is opened, the outlet valve 150 is closed, and the liquid is sucked into the pump cavity 110 through the liquid inlet channel 120; 2, during the liquid outlet process, the coil 210 is powered off, the fixed core 220 loses the magnetic force, the pia 270 connected with the armature 230 is driven by the return spring 260 to move away from the fixed core 220, the volume of the pump cavity 110 decreases, the pressure rises, the inlet valve 140 is closed, the outlet valve 150 is opened, and the liquid is discharged through the liquid outlet channel 130. Through the driving mechanism 200 of the electromagnet structure, the movement of the pia 270 is accurately controlled, and the volume of the pump cavity 110 is accurately changed. The liquid in the pump cavity 110 is discharged, and the above reciprocating working action is realized to achieve the transportation of the liquid.

[0036] In another embodiment of the application, the directions in which the inlet valve 140 and the outlet valve 150 are arranged in the vertical direction are opposite, the inlet valve 140 and the outlet valve 150 are both high-precision one-way valves, the input end of the inlet valve 140 faces the outside, the output end of the inlet valve 140 faces the pump body 100, the input end of the outlet valve 150 faces the pump body 100, and the output end of the outlet valve 150 faces the outside.

[0037] Specifically, the liquid inlet valve 140 and the liquid outlet valve 150 are made of high-quality imported materials. The new structure is a pressure type sealing design, which avoids the limitation of relying on external air pressure for sealing, 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 an elastically deformable valve disc 170. The valve disc 170 and the valve disc 170 are arranged with a gap, leaving a gap for liquid or gas to flow through. The valve body 160 is a ring-shaped member with a central passage. The inside of the valve body 160 is fixedly provided with a plurality of annularly arranged valve discs 170, the ends of the valve discs 170 extend towards the center of the valve body, and the ends of the valve discs 170 are fixedly connected with valve core pieces 180. When subjected to an inverse external force, the valve core pieces 180 naturally close, and the valve disc 170 is always enabled on the valve core piece 180, so that the valve core piece 180 tightly seals the passage opening. Therefore, the valve core piece 180 is not easy to open by mistake, and the liquid leakage is reduced, improving the precision of the pump. In addition, a sealing ring 190 is fixedly arranged on the top of the valve core piece 180 to improve the sealing performance. When subjected to a positive external force, the valve disc 170 will open to allow liquid to pass through. Specifically, the valve disc 170 and the valve disc 170 are arranged with a gap to facilitate the passage of gas or liquid.

[0038] Liquid suction process: as the skin wave 270 moves downward, the volume of the pump cavity 110 increases, forming a negative pressure. At this time, the valve disc 170 of the liquid inlet valve 140 is automatically opened by a positive action (the valve disc 170 is elastically deformed, the valve core piece 180 is away from the opening gap of the passage, and the liquid will flow out through the gap, the gap between the valve disc 170 and the valve disc 170), allowing liquid to enter the pump cavity 110 from the outside, and the valve core piece 180 of the liquid outlet valve 150 is automatically closed by an inverse action, not allowing liquid to flow out of the pump cavity 110 to the outside.

[0039] 2. Liquid outlet process: as the skin wave 270 moves upward, the volume of the pump cavity 110 decreases, forming a positive pressure. At this time, the valve disc 170 of the liquid outlet valve 150 is automatically opened by a positive action (the valve disc 170 is elastically deformed, the valve core piece 180 is away from the opening gap of the passage, and the liquid will flow out through the gap, the gap between the valve disc 170 and the valve disc 170), allowing liquid to flow out of the pump cavity 110 to the outside, and the valve core piece 180 of the liquid inlet valve 140 is automatically closed by an inverse action, not allowing liquid to enter the pump cavity 110 from the outside.

[0040] In another embodiment of the application, the pump body 100 is connected by the upper cover body 101 and the lower cover body 102 to form the pump cavity 110, and the lower end of the upper cover body 101 is recessed inward to form the upper part and the side wall part of the pump cavity 110, which cooperates with the skin wave 270 to form the pump cavity 110, thereby improving the sealing performance of the pump cavity 110.

[0041] In another embodiment of the application, the armature 230 is internally provided with a downwardly open placement cavity 300, one end of the return spring 260 is fixedly connected to the fixed core 220, and the other end penetrates through the placement cavity 300 and is connected to the armature 230, thereby improving the accuracy of the force of the return spring 260.

[0042] In another embodiment of the application, the lower end surface of the pump body 100 is provided with a threaded opening 310 penetrating therethrough, the outer side wall of the fixed core 220 is provided with a matched thread, and the fixed core 220 is threadedly connected with the threaded opening 310. Specifically, the threaded connection has good stability and convenience, and the fixed core 220 is convenient to disassemble and maintain in later period by using the threaded structure.

[0043] In another embodiment of the application, a link wire harness 320 extends from the pump body 100 and forms an electrical connection with the coil 210.

[0044] In another embodiment of the application, the liquid inlet channel 120 and close to the outer surface of the pump body 100 is provided with a liquid inlet opening 330, the liquid inlet opening 330 is provided with a threaded end, and is threadedly connected with an external connecting mechanism; the liquid outlet channel 130 and close to the outer surface of the pump body 100 is provided with a liquid outlet opening 340, the liquid outlet opening 340 is provided with a same threaded end, and is threadedly connected with an external connecting mechanism. Specifically, the threaded connection has good stability and convenience, and the fixed core 220 is convenient to disassemble and maintain in later period by using the threaded structure.

[0045] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that they are within the scope of the present application, and those of ordinary skill in the art can make several modifications and improvements without departing from the concept of the present application, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A high-precision electromagnetic metering pump, characterized in that: include The pump body and the pump chamber are provided. The pump body is provided with a one-way flow inlet channel and an outlet channel at both ends. The inlet valve and outlet valve with limit backflow are respectively provided in the two channels. The pump body is provided with a sealed pump chamber. The inlet channel and the outlet channel are both connected to the pump chamber. A drive mechanism is located inside the pump body, and the drive end of the drive mechanism is connected to a bearing. The bearing forms the lower part of the pump chamber. Under the action of the drive mechanism, the bearing moves closer or further away, causing the volume of the pump chamber to change and thus change the air pressure inside the pump chamber. The change in air pressure causes the inlet valve and the outlet valve to open and close accordingly. The inlet valve and outlet valve are arranged in opposite directions in the vertical direction, and both the inlet valve and outlet valve are high-precision check valves. The driving mechanism includes a coil, a fixed iron core, and an armature. A support body is fixedly installed inside the pump body along its axial direction. The coil is wound around the outer end of the support body. The fixed iron core is fixedly connected to the bottom end of the support body. The fixed iron core and the coil are electrically connected, causing the fixed iron core to generate magnetic force. The support body also has a movable cavity. The armature is slidable inside the movable cavity. The end of the armature near the pump body is connected to the bearing. Under the magnetic force of the fixed iron core, the bearing moves closer to the fixed iron core in the movable cavity, causing the volume of the pump cavity to change, thereby changing the air pressure inside the pump cavity. The change in air pressure causes the inlet valve and the outlet valve to open and close accordingly. The one-way valve includes a valve body fixedly connected to the pump body. The valve body is a centrally inserted annular component. Multiple annularly arranged valve discs are fixedly arranged inside the valve body. The ends of the valve discs extend toward the center of the valve body, and valve chips are fixedly connected to the ends of the valve discs. There are at least three valve discs, and a sealing ring is fixedly installed on the top of the valve chip. The valve discs are elastic, and the gap between two valve discs is arranged to allow gas or liquid to pass through.

2. The high-precision electromagnetic metering pump as described in claim 1, characterized in that: The driving mechanism also includes a return spring, which 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 de-energized. The volume of the pump chamber changes, thereby altering the air pressure within the pump chamber. This change in air pressure causes the inlet valve and the outlet valve to open and close accordingly.

3. The high-precision electromagnetic metering pump as described in claim 1, characterized in that: The inlet valve has its input end facing outwards and its output end facing the pump body; the outlet valve has its input end facing the pump body and its output end facing outwards.

4. A high-precision electromagnetic metering pump as described in claim 1, characterized in that: The pump body is formed by connecting an upper cover and a lower cover. The lower end of the upper cover is recessed inward to form the upper part and side wall of the pump cavity, which, together with the rubber sheet, constitute the pump cavity.

5. A high-precision electromagnetic metering pump as described in claim 2, characterized in that: The armature has a downward-opening placement cavity inside. 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. The lower end face of the pump body has a through threaded opening. The outer side wall of the fixed iron core has a matching thread, and the fixed iron core and the threaded opening are threadedly connected.

6. A high-precision electromagnetic metering pump as described in claim 1, characterized in that: A connecting wire harness extends from the pump body and forms an electrical connection with the coil.

7. The electromagnetic metering pump according to claim 4, characterized in that: The inlet channel is provided with an inlet port on the outer surface near the pump body. The inlet port has a threaded end and is threadedly connected to an external connecting mechanism. The outlet channel is provided with an outlet port on the outer surface near the pump body. The outlet port has the same threaded end and is threadedly connected to an external connecting mechanism.

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